Pregnenolone (3β-hydroxypregn-5-en-20-one), et quae P5 *, est endogenous steroid hormone. Praecursor progestogens est, mineralocorticoids, glucocorticoids, androgens, et estrogens, tum neuroactive steroids. Praeter, pregnenolone biologically activa in suo iure, agens pro neurosteroid. Sicut alii steroids, pregnenolone ex quatuor cyclicis hydrocarbonum connexis. Ketonum et hydroxylum continet coetus functionis, …