Will serostem help me gain weight?

Perhaps, but risky. Serostim is a human growth hormone used in a variety of conditions of inadequate growth or wasting syndromes such as in HIV patients. As such, it may help you gain weight, but it carries with it much risk. Unless you have a medical reason to use it, i wouldn't recommend it. Better to work on taking in more healthy calories. Here is a link for more info: http://www.Drugs.Com/cdi/serostim.Html.