GnRH (gonadotropin-releasing hormone)
A hormone released by the hypothalamus that controls the pituitary gland's release of FSH and LH.
In plain English
It's the hormone at the top of the chain that tells your pituitary gland to release the hormones that drive your cycle.
Why it matters
Both agonist and antagonist drugs used in IVF work by acting on this hormone's pathway to control ovulation timing.
Related terms
Guides that cover this
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