br What is it Histidine is also a precursor of histamine, a compound released by immune system cells during an allergic reaction. It is needed for growth and for the repair of tissue, as well as the maintenance of the myelin sheaths that act as protector for nerve cells. It is further required for the manufacture of both red and white blood cells, and helps to protect the body from damage caused by radiation and in removing heavy metals from the body. In the stomach, histidine is also helpful in producing gastric juices, and people with a shortage of gastric juices or suffering from indigestion, may also benefit from this nutrient. Sexual Vigor It is reported that an increase in the intake of this nutrient helps with the lengthening of orgasms and also more intense sexual enjoyment. Dose Some people take 1,000 mg of histidine two to three times per day in capsule or tablet form but it is best to work out the dosage requirements as 8-10 mg per day per kilogram of body weight.