This pathway is rate limited by the availability of ribose in tissue. (healingedge.net)
High intensity workouts tend to deplete ATP very fast, while ribose supplements are marked as a way for speeding up the muscle recovery, alleviating the sense of fatigue after training. (fitnessandpower.com)
So in the end, you add in the creatine with Ribose Size, the prices are roughly equal. (bodybuildingforyou.com)