Ammonia and thioglycolic acid free. This amino acid perm , develops its action by means of a modified natural component obtained in the laboratory called “cystine and cysteine”, already present in human hair keratin. Through various laboratory procedures, the cystine acid part is eliminated leaving the alkaline part unchanged. Highly conditioning, makes hair look extremely natural, soft and wavy. Long lasting style definition, even for very curly hair. Does not cause any damage. Leaves hair in very good shape. Biological Neutralizing (Neutral pH). This innovative product is totally hydrogen peroxide free. This feature guarantees very good results even on coloured-hair, leaving colour and brightness unaltered.