Dimethicone is a silicone-based ingredient that forms a smooth, protective layer on your skin. It helps lock in moisture, creates a soft feel, and is commonly used in moisturizers and primers to improve product texture and skin hydration.
Benefits
Improves skin hydration by creating a moisture-barrier layer
Provides a smooth, silky feel to products and on skin
Well-tolerated by sensitive and atopic (eczema-prone) skin
Non-greasy alternative to heavier oils
Science: Clinical studies demonstrate dimethicone is safe and well-tolerated in children with atopic dermatitis from 12 months of age. Research shows moisturizers containing dimethicone effectively improve skin hydration in mild-to-moderate atopic dermatitis patients over 14 days.
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.
Tromethamine is a pH buffer and alkalizing agent used in skincare formulations to neutralize acids and maintain skin-friendly pH levels. It's not typically a featured active ingredient but rather a behind-the-scenes helper that stabilizes product formulations.
Benefits
Helps maintain optimal pH balance in skincare products
Stabilizes formulations containing acidic actives like retinoids or vitamin C
Allows safer delivery of potent ingredients without excess irritation
Potential concerns
Limited data on direct skin effects as a standalone ingredient
Generally used at low concentrations, minimizing irritation risk
May cause irritation if formulation pH becomes too alkaline
Science: The provided literature focuses on tromethamine's use as a pain-relief agent in ophthalmic settings rather than skincare applications. Limited peer-reviewed data is available specifically for its use in topical cosmetic formulations, though it is recognized as a safe, FDA-approved buffer agent in pharmaceutical and cosmetic products.
Phenoxyethanol is a preservative that prevents bacteria, yeast, and mold from growing in skincare products, helping them stay fresh and safe to use. It has been used safely in cosmetics for decades and is effective at very low concentrations.
Benefits
Prevents microbial contamination and product spoilage
Broad-spectrum antimicrobial activity against bacteria and yeast
Minimal impact on beneficial skin bacteria when used at approved levels
Potential concerns
Rare allergic contact dermatitis in sensitive individuals
May cause irritation if used in products at concentrations above 1%
Science: The European Scientific Committee on Consumer Safety considers phenoxyethanol safe for all consumers, including children, at concentrations up to 1%. Adverse effects observed in animal studies required exposure levels approximately 200 times higher than those in cosmetic products, and it is classified as one of the most well-tolerated preservatives in cosmetics.
Water is the primary ingredient in most skincare products, serving as a solvent that dissolves and carries other active ingredients to your skin. It helps hydrate the skin surface and provides the base texture for creams, serums, and lotions.
Benefits
Hydrates and plumps skin
Dissolves and delivers active ingredients
Maintains skin barrier moisture
Science: Water is the most extensively studied skincare ingredient with a century of dermatological evidence confirming its safety and essential role in skin hydration and product formulation.
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.
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.
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.
Dimethiconol is a silicone-based conditioning agent that forms a smooth, protective layer on skin and hair. It's used in cosmetics to improve texture, reduce moisture loss, and enhance the feel of products.
Benefits
Smooths and conditions skin surface
Reduces water loss from skin
Improves product spreadability and feel
Helps protect hair color from fading (in hair care products)
Science: The Cosmetic Ingredient Review Expert Panel concluded dimethiconol is safe for cosmetic use at current concentrations, noting it is not absorbed through the skin. Research confirms its effectiveness in hair conditioning and color protection, with no reproductive, developmental, or carcinogenicity concerns identified.
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.
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.
Octocrylene is an organic UV filter that absorbs ultraviolet radiation, primarily UVB and short-wavelength UVA rays. It's commonly used in sunscreens and other cosmetic products to provide sun protection and prevent UV damage to skin and product formulations.
Benefits
Provides UVB and short-wavelength UVA sun protection
Works synergistically with other UV filters (notably stabilizes avobenzone)
Feels pleasant on skin, which encourages regular sunscreen use
Helps prevent skin cancer and UV-induced skin damage
Potential concerns
Potential allergic or photoallergic reactions in sensitive individuals
Concerns about possible endocrine system effects (currently under ongoing regulatory assessment)
Not a complete broad-spectrum protector on its own (limited UVA coverage)
Science: Recent research indicates octocrylene is stable and provides UV protection with minimal adverse effects compared to other organic filters like oxybenzone. However, potential endocrine concerns have been raised and the ingredient remains under continuous safety review by regulatory agencies including the European Chemical Agency.
Triheptanoin is a specialized oil derived from medium-chain fatty acids that is primarily used as a therapeutic dietary supplement for rare metabolic disorders. In skincare, it functions as an emollient and skin-conditioning agent that helps soften and hydrate the skin barrier.
Benefits
Provides emollient properties to soften and smooth skin
Helps support skin hydration and barrier function
Light texture compared to heavier oils
Potential concerns
Not intended for internal consumption in cosmetic products — therapeutic use requires medical supervision
May cause sensitivity in individuals with fatty acid metabolism disorders
Science: Triheptanoin is clinically established as a therapeutic agent for carnitine-acylcarnitine translocase (CACT) deficiency, where it provides essential calories through a specialized metabolic pathway. Limited peer-reviewed data exists on its use as a cosmetic skincare ingredient; safety and efficacy in topical formulations would require additional consumer-focused research.
