OptiMass™ Beef Gainer is an outstanding weight gainer based on branded beef protein isolate HydroBEEF® (hydrolyzed beef peptides) and high-quality carb-matrix. OptiMass™ Beef Gainer is very low in fat and absolutely free of lactose. Beef protein isolate HydroBEEF® is one of the best protein sources. Beef protein intake in strength athletes is of the long tradition. Opti-Mass™ Beef Gainer is intended for everybody who wants to increase muscle mass and strength.