Pregnenolone is a steroid hormone produced by the adrenal gland synthesized directly from cholesterol. Pregnenolone sits on top of the hormone pathway creating all other steroid hormones such as testosterone, DHEA, estrogens, cortisol, aldosterone and progesterone.
The level of pregnenolone peaks around the mid-twenties and then gradually decreases to the mid-seventies where levels approach zero.
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