Arginine200 is for those who have inborn errors of metabolism such as Urea Cycle Disorders; it's intended to use under strict medical supervision to provide the specific amounts of arginine unable to be achieved by dietary modification alone.. 4-gram packet contains 14 calories, 1.7 protein equivalent, 2,000 milligrams of L-Arginine; 1.9 total carbohydrate and no fat..