Bacillus subtilis is a probiotic bacteria that forms a protective spore. This tough shell lets it survive stomach acid and germinate in the intestines. One common strain is DE111. Taking it daily with food or water can promote more regular bowel movements and a balanced gut microbiome. Some people notice digestive changes within a few days while others take it continuously for ongoing support.
Start with a lower dose if you are sensitive. Mild bloating or gas can happen at first as your gut adjusts. Do not use this supplement if you are immunocompromised or critically ill. Ask your doctor before combining it with medications or other probiotics.