Effects of Dietary Components on Mast Cells: Possible Use as Nutraceuticals for Allergies? Glutathione Reductase from bakers yeast (S. cerevisiae) How Mast Cells Contribute to Autoimmune Brain Disorders Mast cell activation syndrome (MCAS) is one of the most misunderstood conditions I see in my telehealth functional medicine clinic. and it's often the missing piece for people who feel like they're Role of glutathione in oxidative stress. During oxidative stress there Download Scientific Diagram 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.