An androgen prohormone, or proandrogen, is a prohormone of an anabolic-androgenic steroid. Wikipedia

A prohormone is a committed precursor of a hormone consisting of peptide hormones synthesized together that has a minimal hormonal effect by itself because of its expression-suppressing structure, often created by protein folding and binding additional peptide chains to certain ends, that makes hormone receptor binding sites located on its peptide hormone chain segments inaccessible. Wikipedia

Precursor to a hormone Wikidata