Ingredients
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Analysis not yet available for this ingredient.
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Butylene glycol is a humectant—a type of ingredient that draws water into the skin and helps it stay hydrated. It's a small, lightweight molecule commonly used in moisturizers to improve hydration without leaving a heavy feel on the skin.
Benefits
- Increases skin hydration and moisture retention
- Lightweight and absorbs quickly
- Helps other active ingredients penetrate the skin more effectively
Science: Research demonstrates that butylene glycol, when combined with other humectants (like glycerin and hyaluronic acid) and occlusive ingredients in moisturizers, significantly improves skin hydration in both healthy skin and compromised skin conditions such as atopic dermatitis. It is recognized as a safe, effective humectant in dermatological formulations.
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Glycerin is a naturally derived humectant—a ingredient that draws moisture from the air into your skin. It's one of the most widely used and well-studied moisturizing agents in skincare, helping skin feel softer and more hydrated.
Benefits
- Attracts and retains moisture in the skin
- Improves skin hydration and softness
- Helps strengthen skin barrier function
- Suitable for most skin types, including sensitive skin
Science: The Cosmetic Ingredient Review Expert Panel concluded glycerin is safe as used in cosmetics across all concentrations. Research shows glycerin effectively improves skin hydration and is well-tolerated with minimal irritation risk. It is also referenced in clinical guidelines for managing inflammatory skin conditions and maintaining skin integrity.
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Trehalose is a naturally occurring sugar (disaccharide) used in skincare products for its stabilizing and protective properties. It helps preserve the integrity of skin cells and other ingredients, particularly when exposed to environmental stressors like heat or dryness.
Benefits
- Helps stabilize and protect skin cells from damage
- May improve skin barrier function and reduce moisture loss
- Supports ingredient stability in formulations
Science: Trehalose is widely recognized in biopharmaceutical and cosmetic industries for its cryoprotective and stabilizing properties. While peer-reviewed evidence specifically for topical skincare benefits is limited, research demonstrates its effectiveness as a cellular protectant and its ability to enhance the uptake and efficacy of other beneficial compounds in tissues.
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Sodium hyaluronate is the salt form of hyaluronic acid, a naturally occurring substance found in your skin that acts like a moisture magnet. In skincare products, it absorbs water from the environment and binds it to your skin, helping to hydrate and plump the skin's surface.
Benefits
- Delivers intense hydration to the skin
- Helps reduce the appearance of fine lines by improving skin moisture
- Supports skin barrier function
- Suitable for all skin types, including sensitive and oily skin
Potential concerns
- In very dry climates with low humidity, it may draw moisture from deeper skin layers if not sealed with an occlusive product
- Rare allergic reactions are possible but extremely uncommon
Science: While the provided research focuses on intra-articular injections for joint health (showing good safety and efficacy), hyaluronic acid and its salt form are well-established in dermatology for topical hydration. The molecule's safety profile is well-documented across decades of use in medical and cosmetic applications, with severe adverse reactions being extremely rare.
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Caprylyl glycol is a preservative and skin-conditioning ingredient derived from coconut oil. It helps prevent bacterial and mold growth in skincare products while also providing mild hydrating and humectant benefits to the skin.
Benefits
- Helps preserve product freshness and prevent contamination
- Provides gentle humectant properties to help retain skin moisture
- Often used as a gentler alternative to traditional preservatives
Potential concerns
- Rare cases of allergic contact dermatitis have been reported in sensitive individuals
- May cause irritation in those with known sensitivity to glycols
Science: A 200-subject repeat patch test study found no delayed hypersensitivity reactions to caprylyl glycol at typical use concentrations. However, isolated case reports of allergic contact dermatitis exist, suggesting it can act as an allergen in susceptible individuals. It is widely used in infant and sensitive-skin formulations as a preservative alternative.
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Disodium EDTA is a chelating agent that binds to metals and minerals in skincare formulations, helping to preserve product stability and extend shelf life. It's used in small amounts (typically under 2%) to prevent unwanted chemical reactions that could degrade the formula.
Benefits
- Stabilizes cosmetic formulations by binding trace metals
- Extends product shelf life and maintains efficacy
- Allows other skincare ingredients to work more effectively
Potential concerns
- May increase skin penetration of other ingredients by chelating calcium in the skin barrier—only a concern if combined with potentially harmful substances
- Not absorbed through skin in normal use, but inhalation from sprays was identified as a theoretical concern in safety assessments
Science: The Cosmetic Ingredient Review Expert Panel confirmed safety in 2023 based on standard use concentrations. Clinical studies show no skin absorption; however, it can affect how other chemicals penetrate the skin, so formulators must account for this when combining with other actives.
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Propanediol is a lightweight humectant—a molecule that draws water into the skin to keep it hydrated. It's also used in cosmetic formulations as a solvent and preservative booster, helping products stay stable and feel smooth on the skin.
Benefits
- Hydrates and moisturizes the skin
- Improves product texture and spreadability
- Helps preserve formulations naturally
Science: Propanediol can be produced through bio-based fermentation (from glycerol using microorganisms), making it an environmentally friendly alternative to traditional chemical synthesis. It is widely recognized as safe in cosmetic and food applications, with established use as both a humectant and preservative enhancer.
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Aspartic acid is a naturally occurring amino acid that plays a structural role in skin proteins and the extracellular matrix. In skincare products, it may be used to support skin firmness and resilience, though its primary function is typically as a pH buffer or humectant rather than an active anti-aging ingredient.
Benefits
- Supports skin structure as a building block for proteins
- May help maintain skin hydration as a humectant
- Functions as a pH buffer in formulations
Science: Research indicates aspartic acid undergoes racemization (structural change) during skin aging and elastic fiber degradation, suggesting it plays a role in maintaining skin elasticity over time. However, peer-reviewed evidence for aspartic acid as a standalone active skincare ingredient is limited; most studies focus on its structural role in aging rather than its topical application benefits.
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Alanine is a simple amino acid—a building block of proteins—used in skincare products to support skin hydration and provide conditioning benefits. It helps maintain the skin's natural moisture barrier and is generally used in small concentrations as part of formulation systems.
Benefits
- Supports skin hydration and moisture retention
- Helps condition and soften skin texture
- May contribute to the skin's natural amino acid profile
Science: Limited peer-reviewed data available specifically for alanine in topical skincare applications. Alanine is a naturally occurring, non-essential amino acid that is well-tolerated by skin and widely recognized as safe in cosmetic formulations.
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Glycine is a simple amino acid that serves as a building block for collagen, the protein responsible for skin structure and elasticity. In skincare, it helps support skin firmness and may contribute to anti-aging benefits when used as part of collagen-based formulations.
Benefits
- Supports collagen production and skin structure
- May help reduce the appearance of fine lines and wrinkles
- Contributes to skin firmness and elasticity
Science: Research indicates that glycine, as a key amino acid in marine collagen supplements, plays a role in combating skin aging by supporting collagen integrity and minimizing oxidative stress. However, most anti-aging benefits are demonstrated when glycine is consumed as part of collagen peptides rather than applied topically alone.
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Serine is a naturally occurring amino acid that your skin produces on its own. In skincare products, it helps support the skin's natural moisture barrier and may contribute to overall skin hydration and structure.
Benefits
- Supports skin hydration and moisture retention
- Helps maintain skin barrier function
- May improve skin texture and smoothness
Science: Limited peer-reviewed data available for this ingredient in cosmetic skincare applications. Serine is a fundamental amino acid involved in skin biology, but the provided research focuses on disease mechanisms (fibrosis and pemphigus) rather than cosmetic benefits in healthy skin.
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Valine is an amino acid—one of the building blocks your body uses to make proteins. In skincare products, it's included to help support skin structure and barrier function, though it's present in very small amounts compared to what you get from food.
Benefits
- May support skin barrier integrity
- Provides amino acid building blocks for skin proteins
- Generally well-tolerated by sensitive skin
Science: Valine is a standard amino acid with an established safety record in cosmetics. The provided research focuses on prion disease diagnosis using valine polymorphisms as a genetic marker, which is unrelated to skincare efficacy. Limited direct evidence exists on valine's topical skincare benefits in peer-reviewed literature.
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Isoleucine is an amino acid (a building block of proteins) that occurs naturally in the body and in foods. In skincare, it's included in formulations for its potential role in supporting skin structure and resilience, though it's typically present in small amounts.
Benefits
- May support skin barrier function as part of amino acid profiles
- Potential antioxidant properties when combined with other botanical compounds
- Could contribute to skin firmness and elasticity through protein synthesis support
Science: Recent research identifies isoleucine as one of several salivary metabolites with potential relevance to skin health screening, and it appears as a minor component in botanical extracts studied for UV photoaging protection. However, direct evidence for isoleucine's independent efficacy in topical skincare products is limited.
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Proline is an amino acid that serves as a building block for collagen, the protein responsible for skin firmness and structure. Your body uses proline (along with vitamin C) to create and repair collagen in the skin, which naturally declines with age.
Benefits
- Supports collagen production and skin structure
- May improve skin firmness and elasticity
- Helps with skin repair and wound healing
Science: Proline is an essential amino acid in collagen synthesis; vitamin C-dependent hydroxylation of proline is a critical step in forming stable collagen. Limited direct human studies exist on topical proline alone, though it is recognized as a key structural component in skin biology and collagen formation.
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Threonine is an amino acid that your body cannot produce on its own, so it must come from diet or skincare products. In skincare, it functions as a humectant and skin-conditioning agent, helping to attract and retain moisture in the skin.
Benefits
- Helps maintain skin hydration and moisture balance
- Supports skin barrier function as a natural amino acid
- May improve skin texture and softness
Science: Limited peer-reviewed data available for threonine as a direct skincare ingredient. The provided research focuses on threonine as part of BRAF protein kinase pathways in melanoma treatment and fibrosis research, which are not relevant to topical cosmetic use. Threonine is generally recognized as safe in skincare applications.
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Histidine is an amino acid that plays a key role in maintaining your skin's natural moisture barrier. In skincare, it supports the production of natural moisturizing factor (NMF)—compounds that help your skin retain water and stay hydrated.
Benefits
- Supports skin hydration and moisture retention
- Helps strengthen the skin barrier
- May provide antioxidant protection through carnosine production
Science: Histidine is a naturally occurring amino acid essential for human health. Research shows it is a precursor to filaggrin breakdown products that form the skin's natural moisturizing factor, a critical component of skin hydration and barrier function.
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Phenylalanine is an amino acid that, in its modified form (undecylenoyl phenylalanine), is used in skincare to help reduce the appearance of dark spots and uneven skin tone, particularly melasma. It works by interfering with melanin production in the skin.
Benefits
- May help reduce the appearance of dark spots and hyperpigmentation
- Potential support for melasma treatment as an adjuvant therapy
- Generally well-tolerated with minimal side effects
Science: Limited clinical evidence exists for topical phenylalanine derivatives in melasma treatment. A 2022 systematic review identified 2% undecylenoyl phenylalanine as a topical agent with less robust evidence compared to gold-standard treatments like hydroquinone and triple combination therapy, though no severe adverse effects were reported.
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Glutamic acid is a naturally occurring amino acid that functions as a humectant in skincare, helping to draw moisture into the skin and support its natural hydration barrier. It's often used in the form of poly-γ-glutamic acid (γ-PGA), a biodegradable biopolymer derived from bacterial fermentation that enhances the moisturizing properties of skincare formulas.
Benefits
- Humectant that attracts and retains moisture in the skin
- Supports skin hydration and barrier function
- Biodegradable and generally well-tolerated by most skin types
Science: Poly-γ-glutamic acid is a well-documented, biodegradable biopolymer with good biocompatibility and non-toxic profile, widely used in cosmetic formulations. Research confirms it is safe and effective for moisture-binding applications in skincare.
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Arginine is a naturally occurring amino acid that is a building block of proteins found in skin. In skincare products, it's used to support skin hydration and may help improve skin barrier function and elasticity.
Benefits
- Supports natural skin hydration
- Helps maintain skin barrier health
- May improve skin firmness and elasticity
Science: Arginine is a naturally occurring amino acid in human skin with a strong safety profile. Research shows it is a normal metabolite excreted by skin and is used in clinical diagnostics, indicating its natural presence and compatibility with skin biology.
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Glucose is a simple sugar that acts as a humectant in skincare products, meaning it helps draw moisture into the skin and keep it hydrated. It's a naturally occurring ingredient commonly found in honey and other botanical sources.
Benefits
- Hydration and moisture retention
- Humectant properties that help skin feel softer
- Generally well-tolerated by most skin types
Potential concerns
- May contribute to glycation (sugar binding to proteins) with prolonged exposure, potentially affecting skin aging
- Can feed acne-causing bacteria in susceptible individuals
- May cause irritation or sensitivity in some users
Science: Glucose is a key component of honey, which has established antimicrobial, emollient, and humectant properties in dermatological applications. However, the scientific literature raises concerns about sugar and glycation's role in skin aging, suggesting that while glucose provides short-term hydration benefits, excessive or chronic exposure may have negative effects on skin aging.
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Panthenol is a lightweight humectant derived from pantothenic acid (vitamin B5) that draws moisture into the skin and helps maintain hydration. It also supports the skin barrier and can help soothe irritation, making it a popular choice in products designed for sensitive or compromised skin.
Benefits
- Hydrates and moisturizes the skin
- Helps calm and soothe irritated or sensitive skin
- Supports skin barrier function and repair
- Lightweight and non-greasy
Science: Panthenol is one of the few ingredients in sensitive skin formulations with clinical evidence specifically tested on volunteers with sensitive skin. Research confirms it reduces skin inflammation and supports barrier function, though comprehensive clinical studies on this ingredient remain limited compared to some alternatives.
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Ethylhexylglycerin is a preservative and antimicrobial ingredient used to prevent bacterial growth and extend shelf life in skincare products. It's a multifunctional ingredient that helps keep formulations stable and free from contamination.
Benefits
- Prevents bacterial contamination in products
- Helps extend product shelf life
- Works synergistically with other preservatives for enhanced protection
Potential concerns
- May not be effective against all bacterial species (notably some Pseudomonas aeruginosa strains)
- Preservative-related sensitization possible in sensitive individuals, though uncommon
Science: Research shows ethylhexylglycerin has broad antimicrobial activity against many common cosmetic contaminants, though effectiveness varies by bacterial species. Studies demonstrate it can work synergistically with other preservative components to enhance biofilm inhibition.
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Dipropylene glycol is a lightweight humectant and solvent derived from propylene glycol that helps skincare products absorb into skin while drawing moisture to the surface. It's commonly used in serums, toners, and lightweight moisturizers to improve texture and hydration.
Benefits
- Humectant that draws moisture into the skin
- Lightweight feel that doesn't leave greasy residue
- Enhances absorption of other active ingredients
- Helps preserve product stability
Potential concerns
- Rare potential for allergic contact dermatitis in sensitive individuals (documented in medical device contexts)
- May cause irritation or sensitization in people with compromised skin barriers
- Unlikely concern in typical skincare concentrations, but those with known propylene glycol sensitivity should avoid
Science: Dipropylene glycol diacrylate (a related compound) has been identified as an allergen in medical devices in patch testing studies, though the base dipropylene glycol ingredient itself has limited published dermatology data. Allergic reactions appear rare and primarily documented in specialized medical contexts rather than cosmetic skincare use.
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2-Hexanediol is a humectant and preservative booster commonly used in skincare products to help retain moisture and extend shelf life. It works by drawing water into the skin while also enhancing the effectiveness of other preservatives, allowing brands to use lower amounts of traditional preservatives.
Benefits
- Hydrates and moisturizes skin by drawing in water
- Helps preserve products with lower preservative levels
- Works synergistically with other skincare ingredients like niacinamide
Potential concerns
- May cause cell viability concerns at concentrations above 1.0% in laboratory studies
- Limited real-world safety data in humans at typical skincare concentrations (usually 2-5%)
- Potential environmental concern if released into water systems
Science: While 2-hexanediol is widely used as a preservative substitute for parabens, recent cytotoxicity studies raise questions about safety at concentrations commonly found in skincare products (>2%). However, these findings are from laboratory cell studies and may not directly translate to human skin application. Further human safety studies are needed to confirm real-world risk.
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Xanthan gum is a natural thickener derived from fermented bacteria that helps give skincare products a smooth, gel-like texture. It stabilizes formulas and prevents ingredients from separating, while also helping products spread evenly on skin.
Benefits
- Creates smooth, pleasant texture
- Stabilizes emulsions and prevents separation
- Improves product spreadability and application
Science: Xanthan gum is an FDA-approved, anionic polysaccharide with a long history of safe use across food, pharmaceutical, and cosmetic industries since 1969. Its performance as a thickener and stabilizer is well-established in scientific literature, with no notable skin irritation concerns reported.
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Carbomer is a thickening agent and stabilizer that gives skincare products their gel-like texture. It helps create a smooth, spreadable consistency and can hold active ingredients in place on the skin for better absorption.
Benefits
- Creates a smooth, easy-to-apply gel texture
- Helps stabilize and thicken formulations
- Can improve how long active ingredients stay on the skin
- Allows better delivery of beneficial compounds into deeper skin layers
Potential concerns
- Can occasionally cause irritation or sensitivity in very reactive skin types
- Requires proper pH adjustment in formulations (formulators use this, not consumers)
Science: Research shows carbomer is commonly used as a gel base in advanced skincare delivery systems, including those designed for anti-inflammatory and healing treatments. Studies indicate it effectively works with active ingredients like nanoparticles and botanical extracts to improve their penetration and efficacy on skin.
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Analysis not yet available for this ingredient.
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Centella Asiatica Extract is a plant-derived ingredient sourced from an Asian herb rich in natural compounds like triterpenoids and flavonoids. It's used in skincare to help hydrate the skin, reduce inflammation, and support the skin's natural barrier function.
Benefits
- Increases skin hydration and reduces water loss from the skin
- Reduces redness and calms inflamed or irritated skin
- May help soothe conditions like atopic dermatitis or eczema
- Provides antioxidant protection against free radical damage
Science: Clinical studies show that formulations containing 5% Centella Asiatica Extract significantly improved skin moisture and reduced inflammation over four weeks. Research also demonstrates anti-inflammatory and immunomodulatory effects in both cell and animal models of atopic dermatitis, suggesting potential therapeutic value for inflammatory skin conditions.
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Portulaca oleracea extract comes from purslane, a succulent plant rich in antioxidants and soothing compounds. In skincare, it's used to calm irritated skin, reduce redness, and support the skin's natural barrier function.
Benefits
- Reduces redness and visible irritation
- Soothes sensitive or inflamed skin
- Improves skin hydration and smoothness
- Supports skin barrier repair
Science: Clinical studies demonstrate that Portulaca oleracea extract, when combined with other soothing ingredients, significantly improves dryness, roughness, and erythema in sensitive skin over 28 days and aids post-procedure skin recovery. Products containing this extract were well-tolerated with no reported adverse effects.
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Dipotassium Glycyrrhizate is a potassium salt derived from licorice root that functions as a skin-conditioning agent. It's used in skincare products to help soothe and support skin clarity, and has been studied as part of formulations targeting uneven skin tone.
Benefits
- May help reduce the appearance of dark spots and hyperpigmentation
- Gentle skin-conditioning properties
- Well-tolerated in cosmetic formulations with minimal irritation risk
Science: A 2022 clinical study found that a serum containing dipotassium glycyrrhizate (along with other actives) showed statistically significant improvement in melasma with no signs of irritation over 12 weeks. The ingredient is approved by the Cosmetic Ingredient Review panel for use at concentrations up to 1%, with safety data showing it does not absorb significantly into tissues.
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Chamomile flower extract is a plant-derived ingredient made from the dried flowers of German chamomile (Matricaria chamomilla). It's commonly used in skincare for its soothing and anti-inflammatory properties, making it popular in products designed to calm irritated or sensitive skin.
Benefits
- Soothes and calms irritated or inflamed skin
- May help reduce redness and sensitivity
- Antioxidant properties that help protect skin from environmental stress
Potential concerns
- Rare allergic reactions, particularly in people sensitive to plants in the daisy family (ragweed, chrysanthemums)
- May cause contact dermatitis in sensitive individuals
Science: Chamomile has been traditionally used for centuries and is well-documented in herbal medicine literature. While robust clinical studies on skincare formulations are limited, the ingredient has established anti-inflammatory and antioxidant properties supported by phytochemical research.
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Asiaticoside is a natural compound extracted from Centella asiatica (also called Gotu Kola), a plant used in traditional medicine for centuries. In skincare, it's valued for its ability to support skin healing, reduce inflammation, and promote collagen production for firmer, more resilient skin.
Benefits
- May improve skin hydration and moisture retention
- May support collagen synthesis for firmer-looking skin
- Anti-inflammatory properties may help calm irritated skin
- May support wound healing and skin repair
- Antioxidant properties may help protect against environmental stress
- May help reduce the appearance of scars
Science: Peer-reviewed research from 2005-2022 confirms asiaticoside has neuroprotective, anti-inflammatory, antioxidant, and wound-healing properties. Studies specifically support its cosmetic use for skin hydration, collagen synthesis, and anti-aging benefits, though most evidence comes from laboratory and animal studies rather than large-scale human trials.
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Asiatic acid is a natural compound extracted from Centella asiatica (also called gotu kola), a traditional medicinal plant used for thousands of years. In skincare, it's used to support skin healing, reduce inflammation, and promote collagen production.
Benefits
- May support wound healing and skin repair
- Potential anti-inflammatory properties to calm irritated skin
- May help with collagen synthesis for skin firmness
- Antioxidant activity to protect against environmental damage
- Traditional use for scars and skin texture improvement
Science: Research shows asiatic acid, along with related compounds from Centella asiatica, demonstrates wound healing, anti-inflammatory, and antioxidant properties in scientific studies. The ingredient has a long history of traditional use in Ayurvedic and Chinese medicine with established safety profiles, though most clinical skincare studies focus on the plant extract as a whole rather than asiatic acid in isolation.
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Madecassic acid is a natural compound extracted from Centella asiatica (also known as gotu kola), a plant used in traditional medicine for thousands of years. In skincare, it works to support skin healing, reduce inflammation, and promote collagen production.
Benefits
- Supports wound healing and skin repair
- Reduces inflammation and redness
- May improve skin hydration and elasticity
- Antioxidant properties that help protect skin
- May help reduce the appearance of scars
Science: Research shows madecassic acid and related compounds from Centella asiatica have demonstrated anti-inflammatory, antioxidant, and wound-healing properties in scientific studies. These compounds are recognized in traditional medicine and increasingly validated in clinical research for skin health applications, with a strong safety profile in cosmetic use.
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Madecassoside is a natural compound extracted from Centella asiatica (also called Gotu Kola), a tropical plant used in traditional medicine for centuries. In skincare, it's known for supporting skin repair, reducing inflammation, and promoting a more youthful appearance.
Benefits
- May promote collagen synthesis and skin firmness
- Can help reduce inflammation and redness
- Supports skin hydration and barrier function
- May help with wound healing and scar appearance
- Antioxidant properties to protect against environmental stress
Potential concerns
- Rare allergic reactions possible in sensitive individuals
- Limited data on safety during pregnancy and breastfeeding
Science: Peer-reviewed research confirms madecassoside exhibits anti-inflammatory, antioxidant, and collagen-supporting properties in skin. Multiple studies document its use in treating skin conditions and its role in anti-aging and wound healing, though most human clinical trials remain limited in scope.
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Hydroxyacetophenone is a naturally derived compound with antioxidant and antimicrobial properties. It's used in skincare products to help protect skin from environmental stress and maintain product freshness.
Benefits
- Antioxidant protection against free radicals
- Antimicrobial and antiseptic properties
- May help preserve product stability
Science: Research shows hydroxyacetophenone has demonstrated antioxidant, antibacterial, and antiseptic activities in cosmetic and pharmaceutical applications. However, peer-reviewed data specifically evaluating its safety profile and efficacy in topical skincare products for consumers is limited.
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Leucine is an amino acid—a building block of proteins—that is sometimes included in skincare formulations. In topical products, it's primarily used as a skin-conditioning agent, though its direct effects on skin are limited compared to oral consumption.
Benefits
- May support skin barrier function as part of amino acid complexes
- Provides mild skin conditioning properties
Science: The provided research focuses on leucine's role in systemic nutrition and immune function (particularly in psoriasis management via diet), not topical skincare applications. Limited peer-reviewed data exists specifically demonstrating efficacy of leucine in cosmetic formulations applied to skin.
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Lysine is an amino acid that serves as a building block for skin proteins. In skincare, it's primarily used for its potential to support skin barrier function and may have mild anti-inflammatory properties, though its direct topical benefits are limited compared to its derivative form (tranexamic acid).
Benefits
- Supports skin protein structure and barrier function
- May have mild anti-inflammatory effects
- Generally well-tolerated by most skin types
Science: The provided research focuses on tranexamic acid (a lysine derivative with proven anti-inflammatory and skin-brightening effects) rather than lysine itself. Direct peer-reviewed evidence for topical lysine's skincare efficacy is limited; most research highlights tranexamic acid's benefits for hyperpigmentation, rosacea, and inflammation. Lysine alone has minimal documented topical skincare effects compared to its modified forms.
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Tyrosine is an amino acid that serves as a building block for proteins in the skin. In skincare products, it's included for its role in supporting skin structure and potential antioxidant properties, though its direct cosmetic benefits remain limited in published research.
Benefits
- Supports skin protein synthesis and structural integrity
- May provide antioxidant protection
- Generally well-tolerated by most skin types
Science: The reviewed literature focuses on tyrosine kinase inhibitors (pharmaceutical compounds targeting tyrosine kinase enzymes) in treating lupus and cancer, not cosmetic-grade tyrosine as a skincare ingredient. Limited peer-reviewed data specifically addresses the efficacy or safety of tyrosine in topical skincare formulations for everyday consumers.
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Methionine is an essential amino acid that serves as a building block for proteins and plays a role in cellular processes. In skincare, it may support skin cell function and differentiation, though its direct topical benefits remain limited in established research.
Benefits
- May support skin cell turnover and differentiation
- Serves as a precursor for important cellular molecules involved in protein synthesis
Science: Recent research shows methionine (via S-adenosyl-L-methionine) is involved in epidermal cell differentiation processes, but available studies focus on cellular mechanisms rather than topical skincare efficacy. Limited peer-reviewed data specifically demonstrates consumer-facing skincare benefits from methionine in cosmetic formulations.
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Cysteine is a sulfur-containing amino acid that helps your skin defend itself against damage and maintain its structure. It works by boosting your skin's natural antioxidant system and supporting collagen production, making it potentially useful for anti-aging, healing, and protecting skin from environmental stress.
Benefits
- Antioxidant protection against environmental damage and aging
- May support collagen health and skin firmness
- Could help with wound healing and skin repair
- Potential benefits for dark spots and uneven skin tone
- Anti-inflammatory properties
Potential concerns
- Limited clinical evidence in topical skincare products—most research is on oral or injectable forms
- Poor skin penetration and stability in formulas, which is why modified versions (like N-acetylcysteine) are often used instead
- Generally well-tolerated, but individual sensitivity possible
Science: Research shows cysteine and its derivative N-acetylcysteine have promising antioxidant, anti-inflammatory, and collagen-supporting properties in dermatology, but most clinical evidence comes from oral, injectable, or systemic use rather than topical skincare products. Chemical modifications improve stability and skin delivery, though higher-quality studies are needed for widespread topical application.
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Propolis extract is a resinous substance collected by honeybees from plants, rich in antioxidants and bioactive compounds. In skincare, it's used for its potential anti-inflammatory and skin-conditioning properties, though its effects can vary depending on formulation and individual skin response.
Benefits
- Antioxidant protection against environmental damage
- May help soothe inflamed or irritated skin
- Potential antimicrobial properties
Potential concerns
- May cause decreased skin hydration in some individuals (reported in mask formulations)
- Potential allergen for people sensitive to bee products or tree resins
- Limited data on long-term safety in leave-on products
Science: Research shows propolis has anti-inflammatory potential and antioxidant activity, though one clinical study found it reduced skin hydration in 80% of mask users. Most available evidence focuses on oral or dental applications rather than topical skincare efficacy.
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Xylitol is a naturally occurring sugar alcohol that functions as a humectant in skincare, helping to draw moisture into the skin and maintain hydration. It has been safely used in cosmetics, food, and pharmaceuticals for over 50 years.
Benefits
- Hydrates and moisturizes skin by drawing water into the outer layers
- Gentle humectant suitable for sensitive skin types
- Does not trigger rapid blood sugar spikes like regular sugar
Science: Xylitol is endogenously produced in the body and has an established safety history spanning decades of use across multiple industries. Recent cardiovascular research found no significant risk links in clinical studies, though some pilot trials suggest temporary platelet effects at very high doses—irrelevant to topical skincare application.
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Polyglyceryl-4 Caprate is an emulsifier and solubilizer derived from glycerin and coconut oil. It helps blend water and oil-based ingredients together in skincare formulas, and can improve the delivery of active compounds into the skin.
Benefits
- Helps stabilize product texture and consistency
- Improves absorption and skin penetration of other active ingredients
- Allows water-insoluble beneficial compounds to be used in skincare products
Science: Research demonstrates that polyglyceryl-4 caprate can effectively encapsulate and stabilize natural bioactive compounds (such as α-bisabolol) in nanoparticle form, improving their stability in aqueous products and enabling their use in cosmetics. The ingredient itself showed good biocompatibility in laboratory cell studies.
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Anhydroxylitol is a sugar alcohol derived from natural sources, used in skincare formulas primarily as a humectant to help retain moisture in the skin. It works by drawing water into the outer layer of skin, making it smoother and more hydrated.
Benefits
- Improves skin hydration and moisture retention
- Reduces visible skin roughness and fine texture
- Smooths skin microrelief (the tiny peaks and valleys on skin surface)
Science: A 2023 clinical study found that a moisturiser blend containing anhydroxylitol (combined with xylitylglucoside and xylitol) significantly reduced skin roughness measures within 8 hours of application, outperforming some individual moisturisers like urea. The ingredient received a safety clearance from the Cosmetic Ingredient Review Expert Panel in 2025, confirming its safety for use in cosmetics.
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Xylitylglucoside is a natural humectant derived from xylose and glucose that works by drawing moisture into the skin and helping it stay hydrated. It's a gentle, sugar-based ingredient commonly used in moisturisers to improve skin smoothness and texture.
Benefits
- Improves skin hydration and moisture retention
- Reduces skin roughness and smooths microrelief texture
- Gentle humectant suitable for sensitive skin types
Science: A 2023 clinical study found that xylitylglucoside (combined with anhydroxylitol and xylitol) showed strong moisturising effects, reducing skin roughness by 2.8-fold and plateau height by 2.1-fold within 8 hours of application—performance comparable to or better than urea and saccharide isomerate.
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Analysis not yet available for this ingredient.
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Honey Extract is a concentrated form of honey derived from bee products, containing natural sugars, amino acids, and trace minerals. In skincare, it primarily works as a humectant to draw moisture into the skin and support the skin's natural barrier function.
Benefits
- Hydrates and moisturizes the skin
- Helps strengthen the skin barrier
- May reduce water loss from the skin
- Generally well-tolerated and gentle
Potential concerns
- Potential allergen for those with bee product sensitivities
- May cause irritation in individuals with honey allergies
- Limited safety data on high concentrations in cosmetics
Science: Research shows honey extracts provide significant moisturizing effects in cosmetic formulations, with forest honey variants demonstrating stronger hydration than flower honey. One study demonstrated antimicrobial activity in laboratory conditions, though evidence for skincare efficacy in humans remains limited.
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Royal jelly extract is a nutrient-rich substance produced by honeybees, containing proteins, vitamins, and amino acids. In skincare, it's used to help improve skin hydration, support skin thickness, and reduce the appearance of fine lines and wrinkles.
Benefits
- May reduce the depth and visibility of wrinkles, particularly around the eyes
- Helps increase skin hydration and water content in the outer skin layer
- May support skin firmness by promoting dermal thickness
- Potentially helps balance skin microbiome
Potential concerns
- Risk of allergic reactions and contact dermatitis, especially in people with bee product sensitivities or atopic skin conditions
- Rare but serious risk of anaphylaxis in individuals with severe bee product allergies
- May trigger asthma symptoms in susceptible individuals
Science: A 2025 clinical trial demonstrated that protease-treated royal jelly improved wrinkle depth, skin hydration, and dermal thickness over 12 weeks compared to placebo. However, royal jelly is a known allergen with documented cases of contact dermatitis, asthma, and anaphylaxis, particularly among atopic populations, so it should be avoided by anyone with bee product allergies.
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Anise fruit extract is derived from the star anise plant and is used in skincare for its aromatic and potential antioxidant properties. It contains compounds like anethole that may help soothe and protect the skin, though its primary role in formulas is often flavoring or fragrance.
Benefits
- Antioxidant protection from free radicals
- Mild soothing and anti-inflammatory properties
- Pleasant natural fragrance and sensory appeal
Potential concerns
- Potential allergen for sensitive or fragrance-sensitive individuals
- May cause irritation in those with anise or licorice sensitivities
- Limited data on safety at high concentrations in topical use
Science: Limited peer-reviewed data available for this ingredient in skincare formulations. General botanical literature suggests anise contains antioxidant compounds, but clinical studies on its efficacy and safety in cosmetics are sparse.
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Analysis not yet available for this ingredient.
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