I have started workout one and half month before already completed One 5lbs ON PRO COMPLEX GAINER and it helps me to increase 2 Kg weight. Now my GYM trainer advice me to take adrenaline nutrition deca mass for Weight Gaining.
if i were you, id look into a boladrol and trenazone stack(their legal, website is at the bottom where you can find them cheap)
or at least running a boladrol cycle and then a few months later a trenazone cycle and then stack them together but id advise ONLY looking into things like this if you have a few years of legit training under your belt
and your 18 or over.