Dealing with mast cell activation syndrome (MCAS)? Discover which supplements can help and why improving gut health might reduce mast cell reactivity—particularly for those with postviral conditions like ME/CFS.

If you have headaches, nasal congestion, low blood pressure, heart palpitations, hives, itching, or digestive distress, you may be histamine intolerant.

An intolerance to histamine is not considered a typical food allergy, but a pseudo-food allergy. Just as with a typical food allergy, avoidance is key. Read what foods are highest in histamine.