D-Ribose For Workout, Energy, and Recovery During strenuous exercise, large amounts of ATP, the body’s primary energy-carrying molecule, can be lost from the heart and skeletal muscle cells. d-Ribose is a simple 5-carbon monosaccharide, or pentose sugar, that is used by the body to synthesize nucleotides, nucleic acids, glycogen, and other important metabolic products. Supplemental d-ribose bypasses the rate limiting steps that are slow to replenish lost nucleotides,thus providing an efficient way to renew energy in a short amount of time.* Powder Option Available: 100, 200 Suggested Use: 1 rounded teaspoon daily. Allergies: Suitable for vegetarians. Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no starch, salt, preservatives, or artificial color, flavor or fragrance.