Vitamin B6 is a group of closely related chemical compounds with similar names, pyridoxine, pyridoxal and pyridoxamine, which occur naturally in many foods. The Vitamin B6 group play an essential role in the energy-producing pathways of the body required during exercise, i.e., converting proteins, fats and carbohydrates into energy, and are used during the production and repair of cells. Our body also needs Vitamin B6 to make haemoglobin within red blood cells, a major determinant of oxygen delivery to the muscles during aerobic endurance exercise. An insufficient intake of Vitamin B6 can result in a reduced ability to perform high-intensity exercise and a decreased ability to repair and build muscle. Current research suggests that exercise may increase our requirements for this important nutrient.