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.
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.
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.
Potassium hydroxide is a strong alkaline chemical used in skincare products primarily as a pH buffer and emulsifier to neutralize acids and help blend oil and water-based ingredients. In cosmetics, it's used in very small amounts to adjust and maintain product pH.
Benefits
pH adjustment and stabilization
Helps create stable emulsions in creams and lotions
Enables mixing of incompatible ingredients
Potential concerns
Can cause skin irritation or chemical burns if used at high concentrations
May disrupt skin's natural pH if product formulation is inadequate
Requires careful formulation to ensure safe levels for consumer use
Science: The provided research discusses potassium hydroxide only as a laboratory diagnostic tool (KOH wet-mount preparation for fungal testing), not as an active skincare ingredient. Limited peer-reviewed data exists specifically on potassium hydroxide safety in cosmetic formulations at consumer-use concentrations. Safety depends entirely on proper dilution and formulation by manufacturers.
