Progressive Labs D-Ribose offers support for the heart, cells, and energy. D-Ribose is a unique sugar that serves as the foundation for many important compounds, including DNA, RNA, and most importantly, ATP (adenosine triphosphate), the "energy currency" of the cells. This simple 5-carbon sugar is the structural backbone of ATP, driving both its synthesis and recycling. 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 healthcare professional before using this product if you are diabetic, insulin dependent, pregnant or lactating.