DMDM hydantoin is is an antimicrobial formaldehyde releaser preservative with the trade name Glydant. DMDM hydantoin is an organic compound belonging a class of compounds known as hydantoins. It is used in the cosmetics industry and found in products like shampoos, hair conditioners and skin care products.

DMDM hydantoin works as a preservative because the released formaldehyde makes the environment less favorable to the microorganisms. Cosmetic Ingredient Review Expert Panel has evaluated DMDM hydantoin and determined that it is safe as a cosmetic ingredient.

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