Butylene glycol is a humectant—a type of ingredient that draws water into the skin and helps it stay hydrated. It's a small, lightweight molecule commonly used in moisturizers to improve hydration without leaving a heavy feel on the skin.
Benefits
Increases skin hydration and moisture retention
Lightweight and absorbs quickly
Helps other active ingredients penetrate the skin more effectively
Science: Research demonstrates that butylene glycol, when combined with other humectants (like glycerin and hyaluronic acid) and occlusive ingredients in moisturizers, significantly improves skin hydration in both healthy skin and compromised skin conditions such as atopic dermatitis. It is recognized as a safe, effective humectant in dermatological formulations.
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.
Citric acid is a naturally occurring organic acid commonly used in skincare products as an exfoliant and pH balancer. It belongs to a group of ingredients called alpha-hydroxy acids (AHAs) that help remove dead skin cells from the surface.
Benefits
Gentle exfoliation to improve skin texture and appearance
Helps reduce the appearance of keratosis and acne
Balances product pH to maintain skin compatibility
Potential concerns
Can cause irritation, redness, or sensitivity in some users, especially with prolonged or frequent use
May increase sun sensitivity — sunscreen use is recommended when using AHA products
Not suitable for very sensitive or compromised skin without caution
Science: Citric acid is an established AHA used in cosmetics for superficial peeling and skin appearance improvement, though research emphasizes that caution should be exercised due to potential adverse reactions. It is widely produced industrially and well-established in skincare formulations.
Silica is a mineral powder derived from silicon dioxide that's commonly used in skincare and makeup products. It works primarily as a texture enhancer and absorbent, helping to mattify skin, improve product feel, and absorb excess oil.
Benefits
Mattifies skin and reduces shine
Improves product texture and spreadability
Absorbs excess sebum and moisture
Creates a smooth, refined appearance
Potential concerns
When used as nanoparticles, potential for skin penetration remains under study
Inhalation of silica powder (primarily occupational concern) has known health risks; topical use in cosmetics is considered lower risk
Listed among potential carcinogenic substances in cosmetic formulations, though safe use levels and regulatory limits are established in the EU and US
Science: A 2023 review of European facial cosmetics identified silica among potential carcinogenic ingredients present in commercial products, though this reflects presence rather than proven harm at typical use concentrations. Research on silica nanoparticles suggests they are being developed for cosmetic use, but percutaneous penetration and long-term safety data remain limited. Regulatory agencies (EU, FDA) have established safe concentration limits for cosmetic use.
Xanthan gum is a natural thickener derived from fermented bacteria that helps give skincare products a smooth, gel-like texture. It stabilizes formulas and prevents ingredients from separating, while also helping products spread evenly on skin.
Benefits
Creates smooth, pleasant texture
Stabilizes emulsions and prevents separation
Improves product spreadability and application
Science: Xanthan gum is an FDA-approved, anionic polysaccharide with a long history of safe use across food, pharmaceutical, and cosmetic industries since 1969. Its performance as a thickener and stabilizer is well-established in scientific literature, with no notable skin irritation concerns reported.
