Histamines are biochemicals produced by normal human immune cells and gut bacteria. And they are fascinating. The first surprise? Histamines mainly function as neurotransmitters. It’s a brain chemical, like serotonin or dopamine. Antihistamines are sometimes used to treat anxiety! So, how come when we say histamines, most people think antihistamines, as in something to get rid of allergy symptoms? Histamines get connected to allergic response bec...

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