Lamberts® L-Histidine is a pure, free-form amino acid that is ready to be absorbed by the body without needing to be broken down by digestive enzymes. This product is made in the UK in a factory working to pharmaceutical GMP standards and each capsule provides a full 500mg of L-Histidine HCl. Histidine is considered a non-essential amino acid for adults, however dietary sources (meat, fish and dairy products) of histidine probably account for most of the total found in the body. Histidine is involved with the regulation and utilisation of several essential trace minerals in the body including zinc, copper, manganese and iron. It is also used in the formation of red and white blood cells.Daily Intake: 1 to 6 capsules.