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GNC AMP Amplified Mass XXX Powder Chocolate Flavored Powder is the ultimate sports supplement, loaded with high-quality protein and complex carbohydrates that help build lean muscle. Helps deliver 50g of protein and 748 kcal that help keep the body active and build serious muscle. Not only this, GNC supplements are approved by the World Anti-Doping Agency (WADA) and certified by Informed Choice. Products with these logos have been tested for banned substances.