Ribose or d-ribose improves energy levels both during the day and during workouts. Ribose is a simple sugar that appears to increase endurance energy. For me, it has worked during workouts and if I need an energy boost at work.
The dosage varies depending on the product you choose. I tend to follow the instructions. For workouts you can go with 5-10g with your pre- and post-workout shakes.
Ribose is a pricey supplement but is well worth the investment. Especially for those of us over the age of 40.
Ribose has a negative glycemic index reading and has been known to cause hyperactivitely or even symptoms similiar to low blood sugar. This can be resolved by either lowering the dose of ribose or taking ribose with food.
The Life Changing Power of D-Ribose
Ribose for Cellular Energy
Supplements of Yesteryear
Vera. "Rev up with ribose: optimize energy levels, improve sleep, and enhance mental clarity with this natural supplement. " Better Nutrition. 72.2 (Feb 2010): 22(1).
The Encyclopedia of Supplements. Jim Stoppani. Flex. 29.10 (Dec. 2011): p196.