in a letter to the editor in a 1938 issue of Strength and Health a doctor says he has treated patients with testosterone proprionate.
Interesting..the following is the version of history that I'm familiar with:
AAS user in sports began in
October 1954, John Ziegler, a doctor who treated American athletes, went to Vienna with the American weightlifting team. There he met a Russian physicist who, over "a few drinks", repeatedly asked "What are you giving your boys?" When Ziegler returned the question, the Russian said that his own athletes were being given testosterone.
Returning to America, Ziegler tried weak doses of testosterone on himself, on the American trainer Bob Hoffman and on two lifters, Jim Park and Yaz Kuzahara. All gained more weight and strength than any training programme would produce but there were side-effects.[29] Ziegler sought a drug without after-effects and hit on an anabolic steroid, methandrostenolone, (Dianabol, DBOL), made in the US in 1958 by Ciba.[30][31]