Histamine support at its finest. If you suffer from histamine intolerance or Mast Cell Activation Syndrome (MCAS), supplementing with DAO can support histamine levels while you are working on the root cause of your condition. Containing Porcine Kidney Extract with 7% diamine oxidase enzyme (DAO), with supportive anti-histamine nutrients Vitamin C & Quercetin, these 'Natural' Anti Histamine tablets are perfect to carry with you. Packaged in a convenient tin, easy to carry with you at all times and for easy use prior to eating.