D-ribose might be unfamiliar to you, but is an entirely natural compound made by your body throughout life. Technically, D-ribose a pentose sugar, or a 5-carbon sugar (more familiar sugars like glucose and fructose have 6 carbon atoms). As part of RNA and DNA, D-ribose is needed for cell maintenance and growth. But the exciting thing about D-ribose is that it initiates the production of the critical energy molecule ATP. ATP is the primary energy source for cells but is rapidly depleted in muscle tissue by strenuous exercise. Since, creatine helps to recharge spent ATP (known as ADP) and D-ribose initiates the production of ATP, combining creatine with D-ribose is a great way to support robust cellular energy levels. NOW D-ribose powder in the economical 8 oz jar is becoming a core supplement for customers looking to maximize their energy levels in a healthy way, without the drawbacks of stimulant ingredients. D-ribose is available in tablets or powder; most people use the powder. NOW D-ribose is a neutral tasting, slightly sweet granular powder that's very easy to take 'straight', or can be mixed into other liquids. Most people take D-ribose directly, first thing in the morning with a glass on water and a second dose later in the day. A serving of NOW D-ribose is 5 grams, and most people take 5-20 grams daily.