Lactobacillus acidophilus naturally occurs in the digestive tract and is one of the most commonly studied probiotic bacteria strains. It has been studied as a solution for an array of digestive issues, including reducing the symptoms of lactose intolerance and reducing abdominal pain and symptoms in individuals with IBS. Cellular studies have found that L. acidophilus may increase the presence of anti-inflammatory signaling molecules and decrease the presence of pro-inflammatory signaling molecules. L. acidophilus may support a strong immune system: in one study of children, consuming L. acidophilus in combination with B. lactis (which is also present in our probiotic powder) was associated with a shorter duration of acute respiratory infections.