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.
Propylene glycol is a lightweight humectant and solvent commonly used in skincare formulations. It helps draw moisture into the skin and improves the texture and spreadability of products.
Benefits
Hydrates skin by attracting and retaining moisture
Enhances product texture and makes formulas easier to apply
Helps active ingredients penetrate the skin more effectively
Improves stability and shelf life of formulations
Potential concerns
May cause contact dermatitis or irritation in sensitive individuals
Can occasionally trigger allergic reactions in susceptible people
High concentrations may feel sticky or heavy on some skin types
Science: Research confirms propylene glycol acts as a penetration enhancer in topical formulations, improving skin uptake of active ingredients. The ingredient is widely studied and considered safe at typical cosmetic concentrations, though individual sensitivity varies.
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.
Methylparaben is a preservative used in skincare and cosmetic products to prevent bacterial and fungal growth, extending shelf life. It's one of the most commonly used preservatives in the beauty industry and has been approved for use in cosmetics across most regulatory regions.
Benefits
Prevents microbial contamination and product spoilage
Allows products to remain safe and effective throughout their shelf life
Cost-effective preservation at low concentrations
Potential concerns
Classified as a potential carcinogen in recent literature reviews; however, regulatory bodies consider approved concentrations safe
Some studies suggest parabens may have weak estrogenic activity, though real-world risk at cosmetic-use levels remains debated
May cause contact sensitivity or allergic reactions in individuals with paraben sensitivity
Science: A 2023 review identified methylparaben among potential carcinogenic substances in analyzed cosmetics, though the authors note these are used 'within allowable range of established concentrations.' Current EU and regulatory approval suggests approved concentrations are considered safe for consumers, but long-term exposure studies at cosmetic levels remain limited.
Propylparaben is a preservative used in skincare products to prevent bacterial and fungal growth, extending shelf life. It's one of several paraben preservatives commonly found in cosmetics and personal care products.
Benefits
Prevents microbial contamination
Extends product shelf life
Cost-effective preservation
Potential concerns
Potential endocrine-disrupting properties at high concentrations
Detectable in human urine, suggesting systemic absorption from cosmetic use
May reduce fecundity in animal models at very high exposures
Science: Research in Drosophila models shows propylparaben has estrogenic properties and can reduce fecundity at high concentrations (200 mM), though typical cosmetic use involves much lower levels. Human biomonitoring studies confirm paraben absorption through skincare products, but long-term health effects at cosmetic exposure levels remain understudied in humans.
