Cyproheptadine
"Really WOW! I've taken this "Periactin / Ciptadine / Cyproheptadine" and I managed to gain 20kg in 2 months! I was skinny, 57kg and I'm now 77 kg! I can take it when my weight drops a bit and it works wonders. Really, if you struggle to gain weight or appetite, try this tab. It's unbelieveable!"