Kigtropin is a human growth hormone (HGH) manufactured by Kigtropin Biotechnology Co., LTD, China, using recombinant E. coli technology. Kigtropin is supplied in boxes containing a single 3ml/30iu cartridge. Each cartridge contains recombinant human growth hormone consisting of 191 amino acid residues, identical to that of a native protein, and produced in E. coli expression system.