Progressive Labs D-Ribose Peak ATP 309g offers support for the heart, cells, and energy. Ribose is a naturally occuring substance used by every cell in the body to build energy. It is the critical compound in heart energy and the most fundamental building block of adenine triphospate (ATP), the primary source of energy for every cell in the body. This product also contains PEAK ATP developed through a proprietary fermentation process, PEAK ATP delivers the exact molecule the human body needs to create energy. Recommended use: Mix 5 grams (2 teaspoons) with 6-8 ounces of water, stir briskly and drink. Take twice daily, or more, on an empty stomach 30 minutes before meals, or as directed by a healthcare professional. Consult a health care professional before using this product if you are diabetic, insulin dependent, pregnant or lactating.