Jintropin is prouced at Genescience Pharmaceuticals by recombinant DNA technology in E.coli secretion expression system. Jintropin has the same amino acid sequence with 191 residues as the native human growth hormone produced in the human body. Jintropin is used to treat GH deficiency and a few other legitimate disorders (see Growth hormone treatment). It also has a number of controversial uses (see HGH controversies).