Health Aids Acidophilus plus 4 billion is a dietary supplement of acidophilic probiotic strains for good gastrointestinal health. The healthy intestinal (digestive) system has a delicate balance of intestinal flora. Friendly bacteria constantly compete with unfriendly (pathogenic) bacteria to maintain a healthy balance. In some cases, this balance is disrupted, for example, by certain foods (mainly rich in sugars), antibiotics, stomach disorders, diarrhea or even taking contraceptives. This disruption of the intestinal flora can cause various complex problems such as irritable bowel syndrome and candidiasis. Health Aids Acidophilus plus 4 billion increases the number of friendly bacteria, creating a healthy flora, which helps with digestion and, by extension, the overall good health of the body. It contains prebiotics and is lactose and gluten free.