Initial Posting: 1/14/2015    Last Update: 8/4/2017
Answer: Since the effects of individual bacteria strains vary, the first thing to consider when choosing a probiotic supplement is the reason you are taking it. Certain strains, for example, may help with weight loss, lower cholesterol or reduce allergy symptoms, while others have been shown to help with digestive issues, such as diarrhea from antibiotics and irritable bowel syndrome. The uses and evidence for various strains are summarized in a reference table in the Probiotic Supplements Review (be aware that certain strains should be avoided by people with milk allergies or people taking certain medications).
Once you have identified the right strain or strains, it's important to find a product that provides a dose that's been shown to be effective, and that contains it's labeled dose (ConsumerLab.com tests have found some probiotic supplements to contain less than half the amount of organisms claimed on the label!) To get test results for popular products, plus additional tips for choosing a probiotic supplement, see the Probiotic Supplements Review >>