vitamin B12
technically, antipsychotic medication will (antipsychotics do the opposite to your body what amphetamines do because they lower dopamine instead of increase it). but it isn't worth it unless you are willing to sleep 16 hours a day.
anyone tried that, using antipsychotics, ssri's, mood stabalizers, etc for weight gain? i have no intention of doing so but i wonder if anyone else has.