Lactobacillus casei is a type of beneficial bacteria commonly found in the human gut and various fermented foods. It plays a crucial role in digestion by helping to break down lactose, making it easier for people who are lactose intolerant to consume dairy products. This bacterium is also known for its ability to produce lactic acid, which helps maintain a healthy balance of gut flora. In addition to its digestive benefits, Lactobacillus casei is often used in probiotic supplements and dairy products like yogurt and cheese. Research suggests that it may support the immune system and improve overall gut health, contributing to better well-being.