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Louisiana Fertility Clinic
In a natural cycle, follicle stimulating hormone (FSH) is released by thepituitary gland, which is under the influence of the hypothalamus. FSHdirectly stimulates the ovaries to produce ovarian follicles each of whichcontains an egg.
In an "unstimulated cycle" the hormonal feedback mechanisminvolving luteinizing hormone, estrogen, and FSH signals the pituitary toreduce FSH production as the follicles mature. Conversely, FSH is given byinjection in an IVF cycle, which bypasses the normal feedback/regulationmechanism resulting in the development of multiple eggs.