Ribose is fast becoming one of the most popular supplements with sprint and endurance athletes. Ribose is a special sugar, which plays a unique role in maintaining muscle ATP levels during repeated sprints. ATP is required for any muscle contraction - as the muscle’s work rate increases more ATP is consumed and must be replaced in order for the muscle to keep moving. Research has shown that ribose maintains work output during intense exercise such as sprinting and interval training. Key Features: Helps maintain muscle output during intense exercise. Mix with water or electrolyte drink. 10g to 16g recommended daily serving size for improved performance. 500g tub.