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.
Stearic acid is a naturally occurring fatty acid commonly derived from plant or animal sources. In skincare products, it functions as an emollient and emulsifier, helping to soften skin, improve product texture, and stabilize formulations by allowing oil and water to mix together.
Benefits
Softens and moisturizes skin by forming a protective barrier
Improves product texture and stability
Helps other active ingredients penetrate the skin more effectively
Potential concerns
May cause mild irritation or sensitivity in people with very sensitive skin
Can leave a slight waxy residue if used in high concentrations
Science: Research indicates stearic acid acts as a permeation enhancer, potentially improving how active ingredients cross the skin barrier. It is well-established in cosmetic formulation design and has a strong safety history in topical products.
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.
Titanium dioxide is a mineral powder that sits on top of your skin to physically block both UVA and UVB rays from the sun. It's one of the most commonly used active ingredients in mineral (physical) sunscreens and is also used in tinted formulations to provide visible light protection.
Benefits
Provides broad-spectrum UV protection (UVA and UVB)
Physical blocker that doesn't require absorption into the skin
Generally well-tolerated and suitable for sensitive skin
Offers additional visible light protection when used in tinted formulations, which may benefit those with melasma or other pigmentation concerns
Potential concerns
Can leave a white or chalky cast on skin, though nanoparticle formulations minimize this
May feel heavy or occlusive for some users
Science: Titanium dioxide is a well-established, inorganic UV filter with a strong safety profile. Unlike organic sunscreen filters, it is not systemically absorbed and does not pose the environmental concerns (such as coral bleaching) associated with chemical filters. Recent research confirms its effectiveness in both standard and visible light protection applications.
