Isdin Lambdapil Fortifying Hair Mask was formulated for men and women seeking to supplement their diet with essential nutrients for healthy hair. It is especially indicated during periods of hair loss associated with seasonal changes, stress, fatigue, hormonal changes, or other factors that may affect the normal hair growth cycle. The formula combines L-cystine, an amino acid that is part of the keratin structure, with biotin, zinc, and B vitamins. Zinc contributes to the normal synthesis of proteins, including keratin, and helps protect cells against oxidative stress. Biotin contributes to the maintenance of normal hair, while vitamin B6 participates in the regulation of hormonal activity. It also contains Serenoa repens, a plant extract traditionally used in supplements for hair wellness, which helps limit hair loss and promote hair growth. Equisetum arvense (horsetail) extract, a natural source of silicon, contributes to the strengthening and growth of hair. The presence of taurine complements the formula's action in supporting the hair structure. For best results, continuous use for at least three months is recommended, following the natural hair renewal cycle. As a food supplement, it should be integrated into a varied diet and a healthy lifestyle, and should not replace a balanced diet.