For Gut Comfort. Probiotic Gut Health. Milk Free. Lactose Free. Gluten Free. BioGaia® Protectis® tabs is a dietary supplement containing the patented lactic acid bacterium Lactobacillus** reuteri Protectis (L. reuteri DSM 17938) that helps the good microorganisms keep a natural balance in the gut. Because L. reuteri Protectis naturally colonizes humans it has a strong adaptation to persist and interact with humans. L. reuteri Protectis has been tested in more than 150 clinical trials and proven effective and safe for children and adults.