L- carnosine was shown to be effective in both treating and preventing gastric ulcers, in both the stomach and duodenum,12 and has been effective in inhibiting H. pylori.13 In Japan, zinc and carnosine, is approved as an anti-ulcer drug.14
H. pylori is eradicable with mastic gum and L-carnosine. 
A small piece of ginger can be chewed some time before having meals. This stimulates digestion and also treats gastritis infection....
Top high antioxidant foods and herbs - Dr. Axe