pct stands for Post Cycle Treatment. Mainly anti-armatese supplements. most steroids are aromatic, meaning they produce estrogenic side effects. By takeing anti aromatic supplements you stop the production of estrgen. thus you lower the possibilities of balding, hardening of the nipples, **** like that. but when you get off your cycle, your estrogen sky rockets and you completely lose all sources of testosterone. your pretty much a female. so you gotta take pcts until your natural testosterone levels come back into play. i suggest nolvadex or 60XO. 60XO is pretty legit. get info on the juice your takein and go from there. its good to take these during your cycle too.