Histidine in Health and Disease: Metabolism, Physiological Importance . . . L-Histidine (HIS) is a nutritionally essential amino acid (EAA) with unique biochemical and physiological properties, which have created a good theoretical rationale to suggest the use of HIS as a nutritional supplement in a wide range of conditions
Histidine | Essential, Protein, Structure | Britannica histidine, an amino acid obtainable by hydrolysis of many proteins A particularly rich source, hemoglobin (the oxygen -carrying pigment of red blood cells) yields about 8 5 percent by weight of histidine