Mast cells are hypersensitive immune cells that release histamine and other inflammatory mediatorsoften in response to oxidative stress, environmental toxins, and immune imbalance. Many patients with MCAS have low levels of glutathione. Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification MCAS Treatment In Boston + Newton MA Five Journeys Mast Cell Activation Syndrome (MCAS): A Functional Approach to Histamine Intolerance MCCM Medical Cosmetics Glutathione 1500 IU 5 vials x 5 ml Cosmeselect