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.
it's not test testosterone that's responsible for the development of the penis in a baby that has an X chromosome and a y chromosome it's a different Androgen Androgen is just a category of hormones that includes testosterone but testosterone is converted in the fetus to something called dihydrotestosterone and that's accomplish through an enzyme called five Alpha reductase
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because the early penile development and the scroll sac development depends on DHT which is a much much more potent activator of the androgen receptors. If you can't have DHT then testosterone alone cannot masculinize the external genitalia.
well dht is this hormone that is absolutely critical for neonatal development early childhood development and then pubertal development and the reason we know this is because you know those men from papua new guinea that we mentioned earlier who lack that type 2 5-alpha reductase enzyme so they have that genetic deficiency where they don't produce that type of dht in development they actually develop develop as pseudo-hermaphrodite so what that means is that they have ambiguous genitalia until hitting puberty and then they develop genitalia but they're much smaller than normal
Like you will still be markedly male probably if you have adequate testosterone production but you won't get full maturation if you have you know zero DHT from a defect in the enzyme that encodes for five alpha reductase or something.