Epitestosterona, o isotestosterona, también conocido como 17α-testosterona o androst-4-en-17α-ol-3-ona, Es un esteroide endógeno y un epímero de la hormona sexual andrógena testosterona.. Es un antagonista competitivo débil del receptor de andrógenos. (Arkansas) y un potente inhibidor de la 5α-reductasa.
estructuralmente, La epitestosterona se diferencia de la testosterona sólo en la configuración en el carbono que contiene hidroxi., C17. Epitestosterone is believed to form in a similar way to testosterone; a 1993 study found that around 50% of epitestosterone production in human males can be ascribed to the testis, although the exact pathway of its formation is still the subject of research. It has been shown to accumulate in mammary cyst fluid and in the prostate.Epitestosterone levels are typically highest in young males; sin embargo, by adulthood, most healthy males exhibit a testosterone to epitestosterone ratio (T/E ratio) of about 1:1
