Mast cell stabilisers, leukotriene antagonists and antihistamines: A rapid review of the evidence for their use in COVID 19 The Centre for Evidence Based Medicine 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. The Importance of Glutathione in Health and Healing Dr. Todd Maderis Sensitized mast cells for targeted drug delivery and augmented cancer immunotherapy: Cell Mast Cells British Society for Immunology AAAAI Mast Cell Disorders Committee Work Group Report: Mast cell activation syndrome (MCAS) diagnosis and management Journal of Allergy and Clinical Immunology