Lactobacillus

a "friendly" type of bacteria. Usually found in digestive, urinary, and genital systems without causing disease. Also in some fermented foods like yogurt and in dietary supplements.

According to the US National Institutes of Health, lactobacillus is:

Likely effective for...

 * Diarrhea in children caused by a rotavirus.

Possibly effective for...

 * Preventing diarrhea in children caused by antibiotics, in hospitalized adults, due to traveling, caused by the bacterium Clostridium difficile, or due to cancer treatment (chemotherapy).
 * Colic in babies.
 * Lung infections.
 * Treating a ulcerative colitis.
 * Treating irritable bowel syndrome (IBS).
 * Treating vaginal infections caused by bacteria.
 * Treating and preventing eczema in infants and children who are allergic to cow’s milk.
 * Helping prescription medications treat Helicobacter pylori (H pylori) infection, which causes stomach ulcers.

Possibly ineffective for...

 * Vaginal yeast infections after taking antibiotics.
 * Crohn's disease.
 * Reducing symptoms of too much bacteria in the intestines.

Insufficient evidence to rate effectiveness for...

 * Urinary tract infections (UTIs).
 * General digestion problems.
 * Necrotizing enterocolitis (NEC) in babies born prematurely.
 * High cholesterol.
 * Sensitivity to milk (lactose-intolerance).
 * Lyme disease.
 * Hives.
 * Fever blisters.
 * Canker sores.
 * Acne.
 * Cancer.
 * Boosting the immune system.
 * Common cold.
 * Preventing infections in people on ventilators.
 * Other conditions.