Dihydrotestosterone is the androgen primarily responsible for penile development during puberty. Some guys have gone down the rabbit hole of DHT-boosting protocols hoping to reactivate some kind of growth. I've researched this extensively. The honest finding: penile growth from androgens ends with puberty when growth plates are closed and tissue is mature. Adult penile tissue does not respond to DHT stimulation by growing structurally. Some guys on DHT-boosting protocols report improved erection quality and libido — likely from the androgenic effect on vascular and neural function. Not size. The biology simply doesn't work that way post-puberty.
— DHT_Dave