Evidence Level
Preliminary
D-ribose occupies an interesting niche in supplement science. The theoretical mechanism is sound: ATP resynthesis requires ribose, and the pentose phosphate pathway in muscle is slow. However, the translation to athletic performance has been disappointing. Healthy athletes rarely deplete ATP to levels where ribose availability is rate-limiting — normal training depletes ATP by only 10-20%, which recovers within 24-72 hours naturally. The clinical evidence is stronger in cardiac patients where ischemia causes severe ATP depletion that recovers very slowly. For athletes, creatine is a far more effective and proven approach to supporting the ATP system.