MPO and gastric ulcer: Research shows that menthol intervention in a rat model of an ethanol-induced gastric ulcer demonstrated a protective impact on stomach health, evidenced by alterations in myeloperoxidase (MPO), glutathione (GSH), glutathione peroxidase (GSH-Px), glutathione reductase (GR), superoxide dismutase (SOD), IL-6, IL-10, and TNF-α levels [65].