Essential amino acids cannot be synthesised by organism in the body and are obtained from plants e.g., valine, leucine, isoleucine, phenylalanine, threonine, lysine, tryptophan, methionine. Non-essential amino acids can be synthesized by the organism and may not be the requisite components of diet e.g., serine, tyrosine, aspartate, cysteine, glutamate, proline, glycine, alanine, aspargine, glutamate and tyrosine.