Kerastim® S

Tetrasodium Disuccinoyl Cystine. Kerastim® S by Solabia is a water-soluble cystine derivative especially devoted to hair and nail care. The enzymatic grafting of succinic acid onto cystine, a keratin essential amino acid in the nails and hair, helps increase cellular bioavailability of cystine while stimulating keratinocyte metabolism. It increases ATP synthesis, prevents hair from falling out and promotes nail growth.