I'll go ahead and wait before i try adding in histidine and cysteine, or anything in general. but i like what i read. i also like that either gboldeuv or tubzy (i forget who mentioned it), said that they got the libido aspect increased from doing such. up until 2 or 3 months ago, i was all super high energy, but no libido. then i fucked up by using creatine and excessive daily use of nutrabio brand tribulus. this concept interests me because ironically i tried some zinc, and it pulled me out of the hole from that creatine and excessive tribulus experiment that lowered my energy. and some days had a good reaction to it. and other things like selenium. ive noticed feeling good after eating tuna that had selenium in it. and this was months ago. Glycine works for me too as far as a sleep aid too (sometimes).
I keep reading that there are 2 cases when it comes this. i read about such awhile back too. many guys will respond to certain things, and then ill go ahead and try it, and i wont get a response. i was a user of the orginial/oldschool propecia, back from about 2003-2011. that old propecia was deadly.