amino acids are the building blocks of proteins and they can be categorized into three groups namely in dispensable , conditionally indispensable and dispensable. In dispensable amino acids must be consumed in the diet while conditionally indispensable amino acids can be synthesized by human body under most conditions but may required dietary supplementation under certain patho-physiological conditions such as catabolic stress or neonatal prematurity. Five amino acids are dispensable, meaning that they can be synthesized from other amino acids or complex metabolites