Eating foods rich in probiotics and maintaining a healthy intestinal flora can help a person maintain a more efficient immune system. One study indicated that subjects who were given fermented milk drinks instead of regular milk had a higher level of lymphocytes in their systems. Women's Health An improper balance between good and bad bacteria inside the vagina can cause serious uncomfortable infections such as yeast infections and bacterial vaginosis. Some studies have shown that probiotics such as L. acidophilus, when taken as vaginal suppositories, can support antibiotics in the prevention and treatment of vaginal infections. Safety of Probiotics Studies have shown that probiotics can trigger an allergic reaction, which can manifest itself through diarrhea, mild stomach upset, bloating and flatulence in the first few days of application. Some probiotics have been shown to negatively affect metabolic pathways such as carbohydrate metabolism or overstimulation of the immune system. For this reason, if you suffer from serious illnesses or certain intestinal problems, avoid use