JUMBO means BIG! JUMBO means STRONG! The original JUMBO was developed to help those with very fast metabolisms (skinny hardgainers), or people with extreme energy demands due to their activity levels. The nutrient ratios reflect these purposes. The popularity of JUMBO stemming from its quality and results warranted that we develop a specific formula for the more normal and athletic metabolisms, and for the demands of typical bodybuilding training. And the second member of the JUMBO family, JUMBO PROFESSIONAL was born! In JUMBO PROFESSIONAL we shifted the ratio towards a higher protein percentage. While providing 52 grams of high-quality protein (more than JUMBO), the serving size is smaller: 162 grams. This obviously means that the carbohydrate and caloric yield of the formula is lower, because it"s unnecessary to take in higher amounts for those people that fall under the specific body and activity types we had in mind when designing this product. JUMBO PROFESSIONAL is designed with whey protein. Dietary proteins are the source of nitrogen and indispensable amino acids, which the body requires for tissue growth and maintenance. Therefore, JUMBO PROFESSIONAL contributes to the growth and maintenance of muscle mass. Whey protein from milk is a so-called complete protein, because it provides the body with all necessary amino acids, including the 9 amino acids (i.e. Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, Valine) that are considered essential for life, because the body cannot synthesize them.