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.
Hydrogenated lecithin is a plant-derived phospholipid that has been chemically stabilized to resist oxidation and spoilage. In skincare products, it functions as an emulsifier (helping mix oil and water), a skin-conditioning agent, and a delivery system for other active ingredients.
Benefits
Stabilizes emulsions and improves product texture
Enhances penetration of other skincare actives into the skin
Biocompatible and derived from natural plant sources
Helps formulate advanced delivery systems like liposomes and micelles
Science: Recent peer-reviewed research (2025) confirms hydrogenated lecithin is highly stable and soluble in cosmetic formulations, with strong emulsifying properties and ability to improve ingredient absorption through the skin barrier. The hydrogenation process eliminates the oxidation concerns present in unprocessed lecithin, making it a reliable excipient for cosmetic and pharmaceutical applications.
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.
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.
Squalane is a lightweight, skin-identical oil derived from squalene (a natural component of human sebum). It absorbs easily into the skin to lock in moisture and create a smooth, soft feel without leaving a greasy residue.
Benefits
Hydrates and moisturizes skin
Mimics skin's natural oils for better compatibility
Lightweight emollient that doesn't clog pores
Antioxidant properties
Well-tolerated by most skin types
Science: The Cosmetic Ingredient Review Expert Panel confirmed squalane is safe for cosmetic use at typical concentrations (2023). Research demonstrates skin hydrating and emollient activity, and squalane is naturally present in human sebum at ~13%, making it biocompatible with skin.
Caprylic/Capric Triglyceride is a lightweight oil derived from coconut that acts as an emollient and helps formulations blend smoothly. It softens skin and reduces water loss by creating an occlusive barrier on the skin's surface.
Benefits
Improves skin hydration and reduces transepidermal water loss (TEWL)
Lightweight, non-greasy feel compared to heavier oils
Helps deliver other active ingredients deeper into the skin
Smooth, silky texture in skincare formulations
Science: Research shows that emulsions containing 15% caprylic/capric triglyceride significantly increase skin hydration and reduce water loss in healthy subjects. The ingredient is also used as an effective carrier oil in nanoemulsions to enhance penetration of active compounds into skin.
Coco-Caprylate is a lightweight, fast-absorbing oil derived from coconut that acts as an emollient and texture enhancer in skincare products. It helps soften and condition the skin while improving the spreadability and feel of formulations.
Benefits
Lightweight moisturizing without a greasy residue
Improves product texture and skin feel
Helps dissolve and stabilize UV filters in sunscreens
Science: Research shows Coco-Caprylate performs comparably to other standard cosmetic emollients in sunscreen formulations. While it has moderate polarity, it was slightly less optimal than Dibutyl Adipate for maximizing UVA protection in sunscreens, though it does not negatively impact SPF performance.
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.
Behenyl alcohol is a waxy, plant-derived fatty alcohol that acts as a thickener and emollient in skincare products. It helps create stable, creamy textures in formulations and can improve the feel and moisturizing properties of creams and lotions.
Benefits
Thickens and stabilizes product texture
Provides emollient properties for skin conditioning
Helps reduce moisture loss from skin
Creates a smooth, non-greasy feel in formulations
Science: Research from L'Oréal shows behenyl alcohol works effectively as a structure-building agent in oil-based skincare systems, particularly when combined with behenic acid. It forms stable crystalline networks in oils that enhance product stability and texture without irritation concerns.
Maltodextrin is a carbohydrate derived from starches like corn or potato. In skincare, it's used as a filler, thickener, and texture agent — it has no direct active benefit for skin itself.
Science: Maltodextrin is an inert, non-toxic carbohydrate commonly used as a placebo control in clinical nutrition studies, indicating excellent safety and tolerability. No adverse effects on skin health or systemic absorption concerns have been documented.
Cetyl alcohol is a fatty alcohol derived from natural sources like palm oil that works as an emollient and thickening agent in skincare products. It helps create a smooth texture, improve product consistency, and soften the skin by forming a light protective layer.
Benefits
Softens and moisturizes skin
Improves product texture and spreadability
Helps stabilize emulsions (creams and lotions)
Potential concerns
Very rare allergic reactions or contact sensitivity in susceptible individuals
May cause mild irritation in products with high concentrations
Science: Cetyl alcohol has a long history of safe use in topical cosmetics with established safety data. Research indicates it forms nanostructured systems that interact well with skin and does not cause irritation or cellular toxicity in standard formulations.
Caprylhydroxamic Acid is a preservative and chelating agent used in skincare products to prevent microbial growth and extend shelf life. It's a multifunctional ingredient increasingly used as an alternative to traditional preservatives in formulas designed for sensitive skin.
Benefits
Preserves products by preventing bacterial and microbial growth
Chelates metal ions that can degrade product quality
Gentler alternative to some conventional preservatives, particularly for sensitive skin formulations
Potential concerns
May cause skin sensitization, especially when applied to damaged or compromised skin
Requires careful formulation to minimize skin penetration and reduce irritation potential
Science: The Expert Panel for Cosmetic Ingredient Safety concluded that Caprylhydroxamic Acid is safe at current usage levels and concentrations, but advised caution against formulations that increase skin penetration. Research shows it is used at safe levels in infant and sensitive-skin cosmetics as a preservative alternative.
Phenethyl alcohol is a naturally occurring organic compound commonly used in skincare products as a preservative and fragrance ingredient. It helps extend shelf life while contributing a subtle floral aroma to formulations.
Benefits
Natural preservative properties that help prevent microbial growth
Mild fragrance contribution with a pleasant floral scent
Generally well-tolerated by most skin types
Potential concerns
Potential skin irritation in sensitive individuals at higher concentrations
May cause allergic contact dermatitis in fragrance-sensitive people
Science: Phenethyl alcohol is recognized as a safe aroma compound naturally produced during fermentation processes and has established applications in cosmetics. Limited peer-reviewed dermatological safety data is available; safety profile is primarily established through historical use and regulatory approval rather than extensive clinical skincare studies.
Arachidyl glucoside is a plant-derived emulsifier and texture enhancer made from arachidic acid (a fatty acid) and glucose. It helps skincare products blend smoothly and improves their feel on the skin.
Benefits
Improves product texture and spreadability
Plant-derived emulsifier
Helps stabilize skincare formulations
Potential concerns
Known allergen — can cause allergic contact dermatitis in sensitive individuals
May trigger skin reactions in people with existing sensitivities to arachidyl alcohol or related compounds
Science: Multiple case reports document allergic contact dermatitis caused by arachidyl glucoside in skincare products, identifying it as a cosmetic allergen. While safe for most users, it poses a real risk for individuals with contact sensitivities or arachidyl alcohol allergies.
Arachidyl alcohol is a fatty alcohol derived from plant oils that acts as an emollient and thickening agent in skincare creams and lotions. It helps create a smooth texture and supports the product's ability to hydrate and soften skin.
Benefits
Skin softening and smoothing
Improves product texture and spreadability
Supports moisture retention
Potential concerns
Potential for allergic contact dermatitis in sensitive individuals
May cause skin irritation or allergic reactions in rare cases
Science: A 2026 case report documented allergic contact dermatitis caused by arachidyl alcohol combined with arachidyl glucoside in a commercial day cream, indicating that while generally well-tolerated, this ingredient can trigger allergic reactions in susceptible individuals. Overall safety data in peer-reviewed literature remains limited.
Polyacrylate Crosspolymer-6 is a synthetic polymer used as a thickener and stabilizer in skincare formulas. It helps create a smooth, gel-like texture and keeps product ingredients evenly distributed without separating.
Benefits
Creates smooth, spreadable texture
Stabilizes formulas and prevents separation
Helps products feel lightweight on skin
Science: Limited peer-reviewed data available for this ingredient. As a synthetic polymer, it is generally recognized as safe for topical use and is not absorbed through the skin due to its large molecular size. It is approved for cosmetic use in major regulatory regions.
