Bsn true mass strawberry ultra premium lean mass gainer is packed with quality carbohydrates fats and of course plenty of protein so hard gainers can access all the nutrition they need to pack lean mass on their frame in one handy shake this lean mass gainer has been designed to give people who train hard or have a fast metabolism the additional support necessary to add lean muscle mass its a multi functional all day protein blend that feeds your muscles ideal for busy days post workout