BioGaia Osfortis is a probiotic dietary supplement containing the patented lactic acid bacterium L. reuteri Osfortis™ (L. reuteri ATCC PTA 6475) and vitamin D3. Vitamin D contributes to the maintenance of normal bones. Because L. reuteri Osfortis naturally colonizes humans it has a strong adaptation to persist and interact with humans. L. reuteri Osfortis has been tested in clinical trials and proven effective and safe.