All that I know is that when I tried bulk nettle I did put on some size but lost libido. I noticed this with jungle warfare also, which has some kind of high speed nettle extract..... whatever.
Few I know have said same thing about Nettle they lost some libido . Tell you the truth I dont see that as a bad thing . You can function when you want but less of a drive but your workouts get an edge and thats the most important thing lol.
I didnt get much size on it but again dont know anyone (4 guys I know who take it) who lost hair on just nettle .
Nettle in theory does does "kill" DHT so if you put some size think nettle your best bet
Stinging Nettle
I have another link which I will find after work its about DHT and nettle its a plant use type objective link not a bodybuilding type link so its not selling or promoting nettle .