Probiotics are microbial food supplement with beneficial effects on the consumers. They are defined as live microorganisms that, when administered in adequate amounts, confer a beneficial effect on the health of the host. Most probiotics are actually lactic acid-producing bacteria and are normally consumed in the form of yogurt, fermented milks (such as kefir) or other fermented foods. The main benefit of probiotics is to improve the intestinal tract health.

Indeed, the intestinal microbial flora consists of diverse bacterial species that inhabit the gastrointestinal tract. These good bacteria are integral to the origin, development and regulation of the immune system, protection of the body from infection, and maintenance of intestinal metabolic equilibrium. So, probiotics improve the intestinal health tract by adhering and colonizing the gastrointestinal tract, interacting with a wide range of specific human epithelial cells, thus modulating and improving the immunity of the gastrointestinal tract.

In addition, some of the beneficial effects of lactic acid bacteria consumption include: reducing symptoms of lactose intolerance, synthesizing and enhancing the bioavailability of nutrients, enhancing the immune systems, decreasing the prevalence of allergy in susceptible individuals, controlling symptoms of inflammation/arthritis, controlling hypertension and reducing the risk of certain cancer.