Penetration Enhancer
Penetration Enhancer — a substance added to a topical formula to temporarily increase how easily other ingredients cross the skin's outer barrier and reach deeper layers. Common examples include certain alcohols, glycols, fatty acids, and surfactants, which work by loosening the tightly packed lipids of the stratum corneum. Because they can raise absorption of both active and irritating ingredients, formulators use them at carefully controlled levels.
Key points
- Penetration enhancers work mainly by disrupting or fluidizing the lipid matrix that holds skin cells together in the outer barrier.
- Ingredients such as propylene glycol, ethanol, oleic acid, and some surfactants can act as penetration enhancers.
- They are used to improve the delivery and efficacy of poorly absorbed actives in cosmetic and pharmaceutical products.
- Because they lower the barrier's resistance, they can also increase the chance of irritation or sensitivity if used in excess.
Frequently asked
Are penetration enhancers safe in skincare?
When used at established cosmetic levels, common penetration enhancers are generally considered safe, though higher concentrations may increase the risk of irritation for some people.
Do penetration enhancers make active ingredients work better?
They can improve how much of an active reaches deeper skin layers, but the overall benefit depends on the specific ingredient, its concentration, and the full formula.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
