Gaining

Trying out protein powders

i was thinking about buying serious mass from gnc and i was wondering if people advice on how much i should buy and the best way to use it to gain as much as i can. i plan to be using it for 4 weeks
also if there are any other powders that may lead to a better gain please let me know
www.gnc.com/mass-gainers/OptimumNutritionSeriousMass.html
6 years