im almost 21 years old and am 6ft 1 215lbs ~16%bf, im no noobie by any means im just getting the jitters cause ive never used ANY supps and ive been lifting for a while, but never really had any goals, i definitely wanna gain muscle, just not size, i wanna come out leaner. ive researched about pcts, i just dont know where to get them, i was told i cant just walk into gnc and pick em up, right?