MCAS and Quercetin Mast Cell Activation Syndrome (MCAS) Olive leaf extract (OLE) reduces mast cell mediated allergic inflammation ScienceDirect IRE1 determines ferroptosis sensitivity through regulation of glutathione synthesis Nature Communications GutBrain Inflammation and Disrupted Homeostasis Due to Activation of Mast Cells and Microglia Mast cell activation syndrome, neck pain and the vagus nerve