25 % Select options GXN (Greenex Nutrition) Whey Stak Rated 4.70 out of 5 Whey Stak is an advance whey protein formula, which is formulated for ripped muscle growth. Each serving (33.5g) of whey stak includes 24g of protein, and absolutely “ZERO ADDED SUGAR”. It is a perfect combination of calories & protein for rapid growth in muscle mass as well as muscle size. It contains all 9 essential amino acids including BCAA that helps you to provide strength and stamina for an endurance workout. Whey stak, whey protein supplement can be used as a post-workout supplement to repair the muscle tissues and enhance muscle growth.