When you're selecting a probiotic drink, it's helpful to check the nutrition facts. Look for the strain of bacteria featured in the beverage. The best options are often those that contain several different strains and cultures. These probiotics can more effectively address a broad range of potential health concerns. A product like Siggi's or Lifeway Kefir offers multiple strains of probiotics. Look for the calories and sugar content on the label as well. Probiotic drinks come in many different flavors to help them appeal to a wider audience. In some cases, there are a lot of added sugars involved in getting these flavors. If you don't mind the tangy taste of probiotic drinks in their natural state, this is preferable to a drink with a lot of added sugar.