Follicle stimulating hormone (FSH) - Definition

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FSH, or follicle stimulating hormone, is a hormone produced by the pituitary gland located in the brain. In women, it plays a role in the maturation of follicles which are small sacs containing unfertilized eggs. It also acts with another hormone, the luteinizing hormone (LH), in the release of the egg at the beginning of each cycle. In men, it stimulates the production of sperm. Elevated levels of FSH most often indicate the stop of reproductive function (menopause in women, andropause in men) or a possible disorder of the reproductive system.