Ingredient
Styrene/Isoprene Copolymer
What is Styrene/Isoprene Copolymer?
Styrene/Isoprene Copolymer is a synthetic polymer made from the chemical compounds styrene and isoprene. It is created through a process called copolymerization, where these monomers are chemically combined to form a long-chain polymer.
This copolymer is primarily used in cosmetics and personal care products, especially in makeup, as a film-forming agent. It helps in making products durable and long-lasting by forming a flexible, continuous film on the skin. Health evidence on styrene/isoprene copolymer is limited, and there are no significant studies confirming adverse effects specific to its use in cosmetics.
When you see it on a label, it's generally included to improve the product's texture and longevity. Though not inherently risky, it's wise to approach with caution if sensitive to synthetic ingredients.
Commonly found in: lipsticks, eyeshadows, mascaras, cosmetic coatings
What to watch
- The long-term effects of consistent exposure to cosmetic-grade styrene/isoprene copolymer are not well studied.
Benefits
- It enhances the durability and wear of cosmetic products.
The FDA does not specifically regulate styrene/isoprene copolymer in cosmetics, but general safety guidelines for polymers in personal care apply.
Research on styrene/isoprene copolymer is limited; most concerns focus on raw materials rather than the polymerized form in cosmetics.
Styrene/Isoprene Copolymer is synthetic and not animal-derived, aligning with vegan practices.
Sources: Cosmetic Ingredient Review
Scout's take
Synthetic rubber-based polymer. Styrene is classified as a possible human carcinogen. Used as a film-former but raises concerns about residual monomer content.
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