Probiotics release antimicrobial and antibacterial agents, improving specific and nonspecific immunity, by activating macrophages, releasing cytokines, and increasing the level of immunoglobulins; ensures adequate intestinal pH by releasing butyric acid, lactic acid, and propionic acid; facilitates the digestion of proteins and lipids and improves lactose intolerance by producing lactase; and has competitive action with pathogens for nutrients and growth factors. Here, LCT is linked to lactose intolerance.