What is Essential Amino Acid?
Among 20 amino acids, 9 amino acids including Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, and Valine cannot be synthesized in the human body, therefore they are called Essential Amino Acids. In addition, Arginine, Cystein and Tyrosine are considered to be Essential Amino Acid for infants and children as they cannot be synthesized enough for human growth. Essential Amino Acids must be obtained from food or supplementation.
For instance, shortage of even one essential amino acid will result in failure of functional and structural role of amino acids.
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