Description Actilife H. Pylori Defense is a probiotic blend of 12 strains of lactobacillus spp. and Bifidobacterium spp in high strength ? 60 billion and it defends against H.pylori, a bacteria that infect the lining of the stomach. These bacteria are responsible for up to 80%of gastric ulcers and 90% of duodenal ulcers.