Cysteine, a nonessential amino acid, is one of the 20 building blocks of protein. It is a part of organic molecules containing an amino group, which can combine in linear arrays to form proteins in living organisms. And it is believed to play a role in the normal growth rate of hair. mail me now, lusior806(at)lusior(dot)com or lusior806(at)hotmail(dot)com.
L-cysteine