The Histamine Intolerance Site - Coconut charcoal. If your symptoms are gut related, I have found that activated coconut charcoal seems to work particularly well, in an immediate reduction of the symptoms.
COCONUT CHARCOAL Detox and Gas Relief - One Life Natural Market NC
Bulletproof Coconut Charcoal Capsules – Natural Health Garden
Amazon.com: Bulletproof Activated Charcoal, 100% Coconut, Heartburn and Gas Relief, 90 Capsules : Health & Household
Amazon.com: Bulletproof Activated Charcoal, 100% Coconut, Heartburn and Gas Relief, 90 Capsules : Health & Household