Steareth-21
Ingredient Info
Steareth-21 is an emulsifier—a helper ingredient that blends oil and water together in creams and lotions. It's made by combining stearic acid (a natural fatty acid) with ethylene oxide, creating a molecule that stabilizes skincare formulations and keeps them from separating.
Benefits
- Helps create stable, smooth emulsions in creams and lotions
- Improves product texture and spreadability
- Allows other active ingredients to be evenly distributed
Science: Research shows that steareth-21 used in oil-in-water emulsions significantly reduces skin penetration of certain sunscreen agents compared to other emulsifier systems, suggesting it creates a stronger barrier effect. This makes it a preferred choice in protective formulations where controlling ingredient absorption is desirable.
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