The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
And that's accomplished through an enzyme called 5-alpha-reductase. Now dihydrotestosterone has important effects later in life too. We will talk about those. In fact, if you just want to know, dihydrotestosterone is what we would call the dominant androgen in males.
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So the action of dihydrotestosterone which is a derivative of testosterone from a single enzyme you know five five alpha reductase converts testosterone and makes it into dihydrotestosterone or DHT. The action of DHT is best understood on the external genitalia. So DHT acts on the same receptor as testosterone does the androgen receptor except it binds at much higher affinity. So it's a much more potent activator of the receptor. And this activation of the receptor in the external genitalia tissue really is what gives you masculinization of the penis and the scal sack.
DHT is anywhere from oh i don't know i think it's about three to six times more powerful than testosterone and by powerful i just mean has a greater binding affinity for the androgen receptor