probiotics lactobacillus acidophilus.

acidophilus bacillus background bacteria bacterial bacterium bifidobacteria biological biology blue colony color contain dietary digestion digestive fermentation fermented flora food gastrointestinal germ good green gut health healthy human icon illustration infection intestinal intestine label lactic lactobacillus medical medicine microbe microbiology microorganism microscope positive prebiotic probiotic probiotics stomach supplement tract yeast yoghurt yogurt