Histidine is an essential amino acid. Only the L form of amino acids are constituents of protein. Histidine is one of the basic amino acids due to its aromatic nitrogen-heterocyclic imidazole side chain. Histidine is metabolised into histamine, an important physiological substance which is normally freely present in the intestine.
Histidine is one of the major ultraviolet absorbing compounds in the skin. Histidine is important in the production of red and white blood cells; used in the treatment of anemia. Histidine is used in the treatment of allergic diseases, rheumatoid arthritis and digestive ulcers.
Molecular Weight - 155.16
Occurence - 2.23%
Histidine Food Sources
Bananas and grapes, meat and poultry, and milk and milk products are high in Histidine. It is also found in root vegetables, wheat, rice and all green vegetables, though in lesser quantities.
Histidine Deficiency Symptoms
None known, but it is reported that histidine can cause pain in the bony joints. A low urine concentration of histidine has been reported to accompany rheumatoid arthritis.