孕烯醇酮（英语：Pregnenolone，3-羟基孕固烯-20-酮）是一种涉及到孕酮、盐皮质激素、糖皮质激素、雄激素以及雌激素类固醇生成的类固醇激素，因此它是一种激素原。

羊毛甾醇 · 7-烯胆甾烷醇 · 7-脱氢胆固醇 · 胆固醇

医学导航：遗传代谢缺陷

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药物(A16/C10)、中间产物(k,c/g/r/p/y/i,f/h/s/o/e,a/u,n,m)

Pregnenolone (3β-hydroxypregn-5-en-20-one), also known as P5, is an endogenous steroid hormone. It is the precursor of the progestogens, mineralocorticoids, glucocorticoids, androgens, and estrogens, as well as the neuroactive steroids. In addition, pregnenolone is biologically active in its own right, acting as a neurosteroid.