B Complex Vitamin is a group of eight essential vitamins that are important for the body to function properly. These vitamins include Biotin, Niacin, and Choline. Biotin helps to metabolize fats, proteins, and carbohydrates, while Niacin helps to maintain healthy skin and nerves. Choline helps to support liver function and is important for normal brain development. All three of these vitamins are water-soluble and must be taken in through diet or supplementation.