The Key Health Benefits of S Acetyl Glutathione Water for Health Mast Cell Activation Syndrome and Its Impact on the Lymphatics Allergy Research Group Acetyl Glutathione 100 mg 60 Scored Tablets 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.