CRODASONE CYSTINE is a novel copolymer containing the amino acid cystine and silicone. Cystine is a disulfide-bonding amino acid known to penetrate the hair and plays a key role in its structure. Silicones are polysiloxane polymers known for their lubricity and distinct surface effect. As a copolymer of these two moieties, CRODASONE CYSTINE offers similar functionality and displays properties characteristic of both low and high molecular weight materials. More importantly, CRODASONE CYSTINE polymerizes on/in the hair during drying. Such crosslinking creates a heat-activated network of conditioning, enabling CRODASONE CYSTINE to impart sheen to the hair, as well as to repair and prevent cuticle damage caused by everyday grooming practices.