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.
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.
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.
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.
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.
Lecithin is a naturally derived ingredient that acts as an emulsifier and skin conditioner in skincare products. It helps blend water and oil-based ingredients together and can improve the texture and feel of creams and lotions on your skin.
Benefits
Helps create smooth, blended formulations
Conditions and softens skin
Improves product texture and spreadability
Science: The Cosmetic Ingredient Review Expert Panel concluded that lecithin and related phosphoglycerides are safe for use in cosmetics at concentrations up to 50%, based on comprehensive safety assessment. While lecithin can have physiological effects when ingested, these effects are not reproduced through topical skin application.
Polysorbate 60 is an emulsifier and solubilizer derived from sorbitan and polyethylene glycol. It helps blend water and oil-based ingredients together in formulations and can assist in delivering active ingredients into the skin.
Benefits
Helps stabilize product texture by mixing incompatible ingredients
May improve skin penetration of certain active ingredients
Enables creation of lightweight, uniform formulations
Science: Research shows polysorbate 60 functions effectively as a surfactant in nanoparticle delivery systems, enhancing skin penetration of topical actives. It has been used safely in pharmaceutical formulations with established stability profiles and minimal irritation potential at typical cosmetic concentrations.
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.
Propylene glycol is a lightweight humectant and solvent commonly used in skincare formulations. It helps draw moisture into the skin and improves the texture and spreadability of products.
Benefits
Hydrates skin by attracting and retaining moisture
Enhances product texture and makes formulas easier to apply
Helps active ingredients penetrate the skin more effectively
Improves stability and shelf life of formulations
Potential concerns
May cause contact dermatitis or irritation in sensitive individuals
Can occasionally trigger allergic reactions in susceptible people
High concentrations may feel sticky or heavy on some skin types
Science: Research confirms propylene glycol acts as a penetration enhancer in topical formulations, improving skin uptake of active ingredients. The ingredient is widely studied and considered safe at typical cosmetic concentrations, though individual sensitivity varies.
Lavender oil is a fragrant essential oil extracted from lavender flowers, commonly used in skincare for its pleasant scent and traditional soothing properties. It's typically included in small amounts in formulations like serums, creams, and toners for both aromatherapy benefits and potential skin-calming effects.
Benefits
May help calm and soothe irritated skin
Provides pleasant fragrance
Traditionally used to promote relaxation
Potential concerns
Can cause allergic contact dermatitis or sensitization in some individuals
May trigger reactions in people with fragrance sensitivities
Essential oils can be irritating at high concentrations, though amounts in skincare are usually diluted
Science: Lavender oil has a long history of traditional use, but clinical evidence for skin benefits in cosmetic products is limited. Some research suggests lavender may have mild antimicrobial and anti-inflammatory properties, though studies on its effectiveness in skincare formulations are sparse.
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.
Scutellaria baicalensis root extract is derived from the root of a traditional Chinese medicinal plant. It's used in skincare for its antioxidant, antimicrobial, and skin-soothing properties.
Benefits
Antioxidant protection
May help reduce skin irritation and itching
Antimicrobial properties
Skin conditioning
Potential concerns
Rare allergic contact dermatitis reported in sensitive individuals
May cause itching or irritation in some people during initial use
Science: An expert panel concluded this ingredient is safe for cosmetic use at typical concentrations. Research shows it can help reduce itch and irritation, though allergic contact reactions have been documented in rare cases.
Hydroxyethylcellulose (HEC) is a thickening and gelling agent derived from cellulose, a natural plant material. In skincare products, it creates a smooth texture, helps bind ingredients together, and improves how products feel and spread on skin.
Benefits
Creates a smooth, even texture in gels and creams
Helps products spread easily without feeling heavy
Non-ionic, meaning it works well with most other skincare ingredients
Biocompatible and generally well-tolerated by skin
Science: HEC is documented as biocompatible, biodegradable, nontoxic, and water-soluble in peer-reviewed literature. It is widely used in cosmetic and pharmaceutical formulations as a gelling and thickening agent with a strong safety profile in topical applications.
This is a synthetic polymer (plastic-like material) used as a thickener and film-former in skincare products. It absorbs water to create a gel-like texture and helps products spread smoothly while forming a lightweight protective layer on skin.
Benefits
Creates smooth, spreadable texture
Provides light film-forming properties for product adherence
Helps stabilize product formulations
Science: Limited peer-reviewed data available for this ingredient. It is approved for cosmetic use in major regulatory systems (EU, FDA) and is considered a low-hazard synthetic polymer with minimal skin penetration due to its large molecular size.
Sodium Ascorbyl Phosphate is a stable, water-soluble form of vitamin C used in skincare products. It works as an antioxidant to protect skin from free radical damage and environmental stressors like air pollution.
Benefits
Protects skin from oxidative stress caused by pollution and environmental damage
Helps reduce inflammation triggered by air pollution exposure
Stable alternative to pure vitamin C that's less likely to degrade in products
Science: Recent research shows sodium ascorbyl phosphate effectively prevents air pollution-induced skin damage, including reactive oxygen species accumulation and inflammatory responses in skin tissue. It demonstrated superior antioxidant properties compared to other tested skincare ingredients like niacinamide and panthenol.
Broccoli extract is derived from broccoli vegetables and contains natural compounds like sulforaphane and vitamins. In skincare, it's used for its antioxidant properties to help protect skin from environmental damage and support overall skin health.
Benefits
Antioxidant protection against free radicals
May help reduce inflammation
Contains vitamins and minerals that nourish skin
Science: Limited peer-reviewed data available specifically for broccoli extract in cosmetic formulations. However, broccoli is recognized as a safe food ingredient rich in antioxidants; safety concerns are minimal when used topically in skincare products.
Citrus Junos Fruit Extract is derived from yuzu, an East Asian citrus fruit rich in vitamin C and antioxidants. It's used in skincare to brighten the complexion, protect against environmental damage, and provide a refreshing citrus scent.
Benefits
Antioxidant protection from vitamin C content
Brightening and radiance-boosting
May help even out skin tone
Potential concerns
Potential photosensitivity if used in high concentrations before sun exposure
Citrus extracts can irritate sensitive or compromised skin barriers
May cause irritation in those with citrus allergies
Science: Limited peer-reviewed data available for this ingredient. General knowledge of citrus extracts suggests antioxidant potential from natural vitamin C and flavonoids, though stability and efficacy in cosmetic formulations vary by extraction and preservation method.
Paeonia Suffruticosa Root Extract comes from the tree peony plant and is used in skincare for its traditional skin-soothing properties. It contains natural compounds that may help calm irritated skin and provide antioxidant benefits.
Benefits
May soothe and calm irritated skin
Contains antioxidants that protect against environmental stress
Traditionally used in Asian skincare for its gentle properties
Science: Limited peer-reviewed data available for this ingredient. Traditional use in Chinese and Japanese skincare suggests safety and efficacy, but modern clinical studies in humans are scarce.
