| abstract |
(57) [Summary] PROBLEM TO BE SOLVED: To have an excellent protective action on hair, to prevent hair damage, to recover damaged hair, to have excellent gloss, moisture, smoothness, combability, etc. And a hair protecting agent that imparts SOLUTION: A hydrolyzed peptide or a derivative thereof obtained by hydrolyzing a protein derived from a natural product such as an animal, a plant or a microorganism in water or a base containing water as a main component is added to the hydrolyzed peptide or a derivative thereof. By the amide bond between the amino group of the derivative and the carboxyl group of cystine, a cystine-introduced peptide containing cystine is contained to constitute a hair protecting agent. The content of the cystine-introduced peptide in the hair protecting agent is preferably 0.1 to 20% by weight. |