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.
Hexylene glycol is a lightweight humectant and preservative booster used in skincare products to help retain moisture and improve product stability. It also enhances the penetration of other active ingredients into the skin.
Benefits
Helps skin retain moisture
Improves product texture and spreadability
Enhances effectiveness of preservative systems
Potential concerns
May cause mild irritation or redness in sensitive individuals (occurs in roughly 3% of eczema-prone skin)
Potential for delayed allergic contact reactions in susceptible people, though this is uncommon
Less irritating than propylene glycol under occlusion, but still worth avoiding if you have known sensitivities to glycols
Science: A 1989 study found hexylene glycol caused visible skin reactions in 2.8% of eczema patients at high concentrations (30-50%), with potential for delayed allergic sensitization in rare cases. It was less irritating than propylene glycol. One case report mentions hexylene glycol as a potential allergen in medical formulations, though reactions are uncommon at typical cosmetic concentrations.
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.
Disodium cocoamphodiacetate is a mild, plant-derived cleansing agent (surfactant) made from coconut oil. It removes dirt and oil from skin while being gentler than many traditional detergents, making it a common choice in facial cleansers and body washes.
Benefits
Effectively cleanses skin without harsh stripping
Well-tolerated by sensitive skin types
Mild enough for daily use in facial products
Plant-derived ingredient
Science: A 2010 clinical study of 105 patients found disodium cocoamphodiacetate to be one of the most well-tolerated surfactants tested, with no allergic reactions or irritation observed. It is recognized in dermatological literature as a mild amphoteric surfactant suitable for sensitive skin formulations.
