Riboflavin (Vitamin B2), folic acid (Vitamin B9), and niacinamide (Vitamin B3) are essential vitamins that play various roles in the body's metabolism, energy production, and cell growth. Lactic acid bacillus is a probiotic bacterium that helps maintain a healthy balance of gut bacteria and may support digestive health. These ingredients are often combined into a single tablet to provide a comprehensive supplement for overall health and well-being.