Natural Factors Hi Potency B Complex - 50 mg - B Complex vitamins are co-enzymes involved in energy production, and maintaining optimal intake levels and promoting proper absorption and utilization is critical for excellent overall health. The B vitamins are a group of eight water-soluble vitamins that support enzyme activity in many of the body’s essential functions. They are needed to effectively metabolize carbohydrates, proteins, and fats into energy. B vitamins also support normal growth and development, the formation of tissue and red blood cells, and healthy liver function. B vitamins may become depleted by lifestyle and environmental factors such as alcohol consumption, poor or restrictive diets, certain medications, and stress, making daily intake important.