vaccine contraindication hypersensitity to arginine Arginine is a conditionally essential amino acid, meaning most of the time it can be manufactured by the human body, and does not need to be obtained directly through the diet. The biosynthetic pathway however does not produce sufficient arginine, and some must still be consumed through diet. Individuals who have poor nutrition or certain physical conditions may be advised to increase their intake of foods containing arginine. Infants are unable to meet their requirements and thus arginine is nutritionally essential for infants. disposition Oliver He