Histamine intolerance or HIT can cause a lot of uncomfortable symptoms for individuals who struggle with it. What is histamine? It is a neurotransmitter, produced from an amino acid, histidine, which helps deliver chemical messages to the body. Histamine is critical for important functions such as immune, digestion, blood vessel permeability, muscle contraction, and hormone regulation. It also is an important mediator of allergic reactions. Histamine is an inflammatory mediator bringing immune cells to the site where they are needed.…