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

DMDM hydantoin slowly releases   formaldehyde   and works as a preservative by making the environment less favorable to   microorganisms .