krin-upLEI Description Food supplement that combines sulfur amino acids (L-methionine, L-cystine), Biotin, soy extract (titrated at 40% in soy isoflavones) and melatonin, designed to stimulate the regenerative activity of hair bulb cells, in order to reduce hair loss and restore health and vigor. The sulfur amino acids L-methionine and L-cystine are the fundamental components of keratin, the main structural protein of hair, which tends to