Follicle Stimulating Hormone (FSH) Human, Native Protein is a glycoprotein produced from urine of post-menopausal women and has a total molecular mass of 30,000 Dalton. FSH is a heterodimeric hormone consisting of 92 amino acids a chain and 111 amino acids b chain. The FSH is purified by proprietary chromatographic techniques. FORMULATION: Sterile-filtered white lyophilized (freeze-dried) powder. The FSH was lyophilized with no additives. CONTAMINANTS: Less than: 0.1% hCG, 0.5% TSH, 0.5% LH, 0.5% GH, and 0.5% Prl. Free of HbsAg, antibodies to HIV and HCV. OTHER NAMES: Follitropin subunit beta, Follicle-stimulating hormone beta subunit, FSH-beta, FSH-B, Follitropin beta chain, FSH.