FSH is a product containing a highly purified preparation of human follicle stimulating hormone (FSH-HP) extracted from the urine of postmenopausal women. Third generation of urinary gonadotrophins FSH-HP;Use of monoclonal antibodies specific to FSH resulted in further refinements in manufacture, and the production of highly purified (HP) urinary FSH. The presence of LH is less than 0.1% per 75 IU of FSH & Unidentified urinary proteins are less than 5% in Human FSH-HP. FSH consists of two non-covalently linked glycoproteins designated as the alfa and beta subunits. The alfa subunit has 92 amino acids of which two are modified by attachment of carbohydrates. The beta subunit has 111 amino acids of which two are modified by attachment of carbohydrates. FSH is a sterile, lyophilized powder intended for subcutaneous (SC) or intramuscular (IM) injection after reconstitution with sterile 0.9% Sodium Chloride Injection. Each vial of FSH contains 75 International Units (IU) of Follicle Stimulating Hormone (FSH) which is reconstituted with diluents. The in vivo biological activity of Urofollitropin (FSH) for injection, purified is determined by using reference standards calibrated against the First International Standard for follicle- stimulating hormone (FSH, Urofollitropin), Urinary, and Human for Bioassay, National Institute for Biological Standards and Control (NIBSC) at its 46th meeting in 1995. FSH is a glycoprotein that is acidic and water-soluble.