Several herbs have been studied for their potential to target Helicobacter pylori, the bacteria linked to stomach ulcers and gastritis. These include mastic gum, licorice root (especially deglycyrrhizinated), turmeric, green tea, garlic, ginger, oregano oil, and cranberry extract. They may help reduce bacterial load, support gut health, and soothe inflammation, but should be used alongside medical guidance, especially for persistent infections.