Supplement analysis backed by scientific evidence · PT

← All supplements
Limited evidencePhysical performance

D-Ribose

D-ribose is sold on a plausible mechanism — refilling depleted adenine nucleotide pools — but controlled trials in trained people consistently find no performance benefit, and the fatigue and fibromyalgia data everyone quotes come from an uncontrolled open-label study.

What the science says

  • No ergogenic effect in trained athletes Limited evidence

    Nineteen trained males took 10 g/day (2 x 5 g) for 5 days in a randomized double-blind trial and showed no significant change in peak power, average power, torque, fatigue index, lactate, ammonia, glucose or uric acid across repeated 30-second Wingate sprints; the authors concluded that oral ribose does not affect anaerobic exercise capacity. A separate trial dosing ribose before and during intense exercise reached the same conclusion for anaerobic capacity and metabolic markers.

  • The fibromyalgia and chronic fatigue evidence is open-label and uncontrolled Limited evidence

    The widely cited study gave 5 g three times daily (15 g/day, 280 g total) to 41 patients with fibromyalgia and/or chronic fatigue syndrome and reported about 66% improving, with energy up 45% and well-being up 30% on visual analogue scales. There was no placebo group and no blinding — precisely the design in which subjective fatigue and pain scores respond most strongly to expectation. This is hypothesis-generating, not evidence of efficacy.

  • Cardiac claims outrun the data Limited evidence

    Small short trials in ischemic cardiomyopathy have reported improvements in diastolic function and quality-of-life scores, and this is the most biologically defensible use case, since ATP depletion in ischemic myocardium is real. But the trials are small, brief and unreplicated at scale, and ribose appears in no heart failure treatment guideline. Do not substitute it for prescribed heart failure therapy.

Dosage & safety

Studied dosePerformance studies used 10 g/day (2 x 5 g) for 5 days, or 3-5 g taken around training. Symptom studies used 15 g/day as 5 g three times daily. Ribose is a sugar: 15 g/day is roughly 60 kcal of carbohydrate, which matters for anyone tracking intake.
SafetyDoses above about 10 g at one time commonly cause hypoglycaemia-like symptoms — lightheadedness, sweating, shakiness, hunger — because ribose transiently lowers blood glucose; take it with food or carbohydrate and split doses. GI upset, nausea and diarrhoea are also common at higher intakes. Use caution with insulin or sulfonylureas, where additive glucose lowering is a real risk. Ribose metabolism increases uric acid, so caution with gout or a history of urate stones. It can interfere with some blood glucose assays and may lower measured HbA1c-related readings. Not established in pregnancy or breastfeeding. Not banned in sport.

Scientific references

Where to buy

California Gold Nutrition, D-Ribose Powder, Unflavored, 10.6 oz (300 g)

View on iHerb

Referral link — this site may earn a commission on purchases.

Related in Physical performance