It is an amino acid which assimilates Vitamin B and acts as detoxifying substance when consuming various food supplements. It may be converted to glucose and utilised as the source of energy. Cystine is necessary for the immunity when fighting against cell damage and oxidative stress, it also has anti-inflammatory properties. This strong amino acid is considered one of the major factors for hair growth. L-Cystine is the main component of the hair, which plays an important role in alopecia – its deficiency may influence the mechanisms of hair loss.