Biolatte Subtilis is a resistance-boosting product containing patented Bacillus subtilis, a strain of intestinal microbe (not a lactic acid bacterium) that produces the natural antibiotic subtilin. Bacillus subtilis activates antibody-producing cells, thus warding off viruses and pathogenic bacteria. In addition, zinc supports fatty acid metabolism, pH balance and normal immune system functions. Lactose and gluten free.