Gaspari took Sports Nutrition to the highest level with SizeOn, the original intra-workout creatine drink. As clinical research advances, so does Gaspari Nutrition which is why SizeOn has now evolved into the Ultimate Hybrid Intra-Workout Whey Hydosylate Creatine Formula. SizeOn now uses a high quality whey hydrosylate that contains over 50% di and tripeptides as well as a large array of anabolic promoting ingredients such as a high dose of L-Leucine (5 grams) to allow for unparalleled support in athletic performance, skeletal muscle recovery, explosiveness and most notably, immediate increases in muscle size while you are still training. Furthermore Gaspari Nutrition researchers have harnessed the power of pterostilbene - our patent pending and brand new insulin secretagogue - picked specifically to work in concert with our universally acclaimed and patent pending Outlast carbohydrate blend. This powerful combination initiates and promotes muscle volumization and anabolism to levels never seen before in a sports nutrition product. To top it off, we also included LOLA, our cutting-edge, ammonia scavenging amino acid salt of L-Ornithine and L-Aspartate to help battle fatigue. The bottom line is that Gaspari Nutrition has once again outdone itself and yet again redefined what an intra-workout supplement should be - a category of product we created years ago! What is the difference between SizeOn Maximum Performance and SizeOn Pre-Contest? SizeOn contains the revolutionary Outlast carbohydrate complex for maximal performance in the gym and recovery and it contains pterostilbene - our patent pending, naturally occurring insulin secretagogue - which helps to push those carbohydrates (and amino acids and other nutrients) into skeletal muscle cells to maximize glycogen synthesis, cell volumization and myogenesis. This formula is geared towards an athlete looking to "bulk up as fast as possible." SizeOn Pre-Contest does not contain the Outlast complex nor pterostilbene. What is the difference between the new version of SizeOn and the original? The new version of SizeOn contains high amounts of whey protein hydrosylate, leucine, along with more carbohydrates as well as pterostilbene to support insulin levels already within normal range. All in all, it is a much more advanced product based on cutting edge research. Can SizeOn only be used by bodybuilders or can athletes looking to build muscle mass and enhance their recovery use it as well? SizeOn can be utilized by anyone wishing to speed their recovery, build muscle mass, and increase performance.