Amino acid
Histidine
Histidine is an essential amino acid that has to come from food. The body uses it, among other things, to make histamine.
Also listed as L-Histidine
What does a normal portion provide?
USDA lists 1.138 g histidine per 100 g of grilled, skinless chicken breast, or about 0.968 g in an 85 g portion. This is a food-composition estimate for that preparation, not a supplement dose. 1