There are twenty-two amino acids, nine of which are classiﬁed essential. Essential meaning: the human body can not produce those nine amino acids endogenously. Subsequently, the nine essential amino acids must be obtained through diet and supplementation. The nine essential amino acids are; Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, and Valine.
These Amino acids are structural no different then “semi-essential” or “nonessential” amino acids, other than our body’s inability to naturally produce them (the body can produce semi-essential and nonessential amino acids naturally). A balanced diet and healthy intake of foods or supplements high in certain amino acids is a crucial aspect of wellness, especially in middle to older ages.