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 Amazon.com: Allergy Research Group ARG Acetyl Glutathione 100 mg Stabilized Bioavailable Glutathione Antioxidant & Immune System Support Well Absorbed Formula 60 Servings 60 Tablets : Health & Household The Role of Mast Cells in Health and Disease: Part 1 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.