There isn't enough research to know if lactobacillus helps with Crohn's disease or necrotizing enterocolitis (NEC) in premature babies.
Infections. Many studies show that lactobacillus may help prevent infections. For example, it may help prevent lung infections in children in daycare centers. It also may help treat or prevent vaginal infections caused by bacteria.
But there isn't enough known about using lactobacillus for colds or urinary tract infections. And it isn't clear if it can boost the immune system or prevent infections in people on ventilators.
Researchers have used many different doses of lactobacillus. The optimal dose is not known. But a typical daily dose ranges from 1 to 10 billion living organisms pr day. You take this divided into three to four doses each day, ideally before or with meals. It may work better if the product is kept in the refrigerator.
Lactobacillus is called a probiotic when you take it in adequate amounts to help with health. However, supplement ingredients and quality may vary widely from maker to maker. This makes it hard to set a standard dose.