Gaspari size on is a good creatine product, but if you really really want to gain mass, the best way to do it is to eat a lot and lift heavy. You really don't need a product for that. You will find several threads here for mass gainers that are cheap and easy to prepare in your home. Just search and you will find it on this forum.
If you really want to get a product, I would recommend something along these lines:
Prolab N-Large II
Optimum Serious Mass
BSN True-Mass
Good luck.....



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