From what I understand, no one in the PE community who has tried topical DHT has noticed results that can’t be attributed to greater erection quality.
Even if DHT did work, its not sold anywhere these days. The andractim sold by the cyprus pharmacy is definitely fake, and the same goes for that russian one. The only form of DHT you can buy from steroid sites is proviron and I am not sure how one could make this transdermal.
I think it all comes down to androgen receptor sensitivity. Your penis is fully grown once the androgen receptors are desensitised. If you were deficient in androgens during your developing years, the androgen receptors will still be sensitive and so additional dht or other androgens will lead to penis growth. Likewise, when androgens start to decline in old age, your penis will shrink a little and the androgen receptors will upregulate and become sensitive again. I think this is broadly why dht cream works for women, old men and hypergonadal men. The only way this could be replicated in normal young men is if the androgen receptors were somehow desensitized and then overloaded with androgens. A lot of research has been done on androgen receptor desensitization at propeciahelp.com, broadly there are two ways of doing it: 1, trying to sabotage androgen production so that receptors upregulate or 2, other methods that sensitize androgen receptors without shutting down androgens (I think squats and cannabis are two of the hypothesized methods). I believe that it is possible to resensitize androgen receptors and I also believe that if it is done, your penis will grow again, but penis growth takes months if not years, so you would have to be in a constant cycle of downregulating and upregulating androgen receptors for years to get anywhere. It wouldn’t be worth the time investment if nothing else.
I will add one more thing that I think people overlook. Obviously there are lifestyle and supplemental endeavours that can naturally raise your dht levels. If your androgen receptors are still sensitive, you would be able to induce penis growth by raising your dht levels. Furthermore, if your penis hasn’t grown naturally over the last few years, there is no reason to think that exogenous dht would grow it any more than the dht that you’ve naturally been supplying to it up until that point.