Acidophilus, a bacterium found in the intestine, mouth, and vagina, is used as a probiotic. Probiotics refer to the good bacteria that are beneficial for overall health. They are similar, or the same bacteria already present in the body. Acidophilus is found in fermented foods, dairy products such as yogurt, and supplements. These supplements are available as tablets, powders, capsules, wafers, and vaginal suppository. Acidophilus helps to treat digestive disorders and vaginal inflammation. It also helps boost the growth of good bacteria.