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.
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.
Aminomethyl Propanol (AMP) is a pH buffer and preservative used in skincare formulations to maintain product stability and prevent microbial growth. It helps keep products at a safe pH level while extending shelf life.
Benefits
Helps preserve product and prevent bacterial contamination
Balances pH to prevent irritation
Allows brands to reduce reliance on traditional preservatives
Potential concerns
May interact with amino acids naturally present in skin (taurine), potentially affecting biological function—though significance in topical skincare remains unclear
Can cause contact dermatitis or irritation in sensitive individuals
Limited safety data for use in products for infants and very sensitive skin
Science: Recent research (2024) suggests AMP forms hydrogen bonds with taurine, an important amino acid in the body, which could affect its biological functions—though this was studied in controlled laboratory conditions and the relevance to topical skincare exposure is not yet established. AMP is increasingly used as a preservative alternative in cosmetics, including infant formulations, but dermatologists note it may pose irritation risks for sensitive populations.
Pentylene glycol is a lightweight humectant—a ingredient that draws water into the skin to improve hydration and texture. It's commonly used in serums, sunscreens, and moisturizers as a preservative booster and skin-conditioning agent.
Benefits
Improves skin hydration by attracting moisture
Lightweight feel, absorbs quickly without heaviness
Helps preserve product stability and extends shelf life
Potential concerns
Rare contact allergy reported in sensitive individuals
Emerging evidence suggests it may be an uncommon cosmetic allergen—if you have sensitive or reactive skin, patch test first
Science: Safety studies show a high margin of safety at standard use levels (87–671 in adults), with minimal skin penetration due to the ingredient's volatility. However, recent dermatological reports flag pentylene glycol as an emerging contact allergen in some individuals, warranting attention for those with sensitive skin.
Caprylyl Methicone is a silicone-based conditioning agent that creates a smooth, lightweight film on the skin. It's used in skincare products to improve texture, reduce tackiness, and help other ingredients spread evenly across the skin.
Benefits
Smooths skin texture
Reduces greasy or sticky feel
Improves product spreadability and absorption
Science: Limited peer-reviewed data available for this ingredient. It is a volatile silicone commonly used in cosmetics with a strong safety history and low skin penetration due to its molecular structure.
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.
Biosaccharide Gum-4 is a natural polysaccharide (sugar-based) ingredient used as a film-forming agent and thickener in skincare products. It helps create a protective layer on the skin's surface and improves product texture and stability.
Benefits
Creates a smoothing film on skin
Improves product texture and spreadability
Helps with moisture retention
Potential concerns
Potential for allergic contact dermatitis in sensitive individuals
May cause skin irritation in rare cases
Science: A 2013 case study documented allergic contact dermatitis in a patient exposed to Glycofilm® 1.5P (a product containing this ingredient) in an anti-wrinkle cream. While this represents an isolated case rather than widespread concern, it confirms that sensitive individuals may react to this ingredient.
Potassium cetyl phosphate is an emulsifier and skin-conditioning agent that helps mix oil and water together in creams and lotions. It also helps create a protective barrier on the skin to lock in moisture.
Benefits
Helps create stable, smooth-textured creams
Improves skin hydration by forming a protective moisture barrier
Enhances skin softness and spreadability of products
Science: Research shows potassium cetyl phosphate works effectively as part of lipid complexes to improve skin hydration and barrier function, particularly when combined with other fatty acids and ceramide-like ingredients. It creates organized lipid structures on the skin that help reduce water loss and support skin density improvements.
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.
Hyaluronic acid is a naturally occurring molecule found in your skin that acts like a sponge, holding water to keep skin hydrated and plump. In skincare products, it helps improve skin moisture, reduce the appearance of fine lines, and support overall skin texture and firmness.
Benefits
Boosts skin hydration and moisture retention
Helps reduce the appearance of fine lines and wrinkles
Supports skin firmness and elasticity
Well-tolerated and safe for most skin types
May enhance effects of other anti-aging treatments
Science: Multiple clinical studies confirm hyaluronic acid is highly effective and well-tolerated for improving skin hydration and signs of aging. Research shows it works as an effective standalone treatment and also enhances results when combined with other anti-aging procedures, with benefits sustained over extended use periods.
