What is the best supplement?

I would like to know what is the best supplement for optimum weight gain? I need to have something that can add on the most pounds the quickest. Flavor doesn't matter too much to me, as long as the product is good.
Looking for best suggestion...!  

best sup hands down is a multi-v.  

calories and protein brother.. any form you can get'em  

[QUOTE=A.B;107091]calories and protein brother.. any form you can get'em[/QUOTE]agreed