Home - Diamond Nutrition USA Diamond Nutrition, supplements, manufacturer, hard-core bodybuilders, fitness fanatics, raw material, production, cutting-edge technology, manufacturing processes, supplements, athletes, muscle mass, muscle tone, protein powders, creatine, meal replacement, weight gains, weight loss, pre-workout, nutritional, amino acids, thermogenics, top qual We here at USA Diamond Nutrition INC. have been manufacturing our own line of supplements for a number of years with unequalled success.