Histamines
Histamines are chemicals released by the immune system in response to allergens, injury, or infection. They are responsible for triggering inflammation, causing blood vessels to dilate, and increasing the permeability of capillaries. This can result in symptoms such as itching, sneezing, runny nose, and swelling. Histamines also play a role in regulating stomach acid production and neurotransmission in the brain.