Doctor’s Best Fully Active B Complex with Quatrefolic contains all eight important B vitamins; thus, it’s the best vitamin B supplement for professional athletes. The formula is a full spectrum designed for optimal absorption and supports overall health and well-being. Enriched with Quatrefolic, the most bioavailable form of folate, this supplement will support energy production, the body’s genetic blueprint, proper cell division, and mental and emotional well-being. In addition, the product is vegan, non-GMO, gluten-free, and soy-free.