D-ribose
Summary
D-ribose is a simple sugar used to make ATP. In a 153-person heart-failure trial, 15 g/day for 12 weeks improved symptom scores and ejection fraction versus placebo. Exercise trials are mixed, and fatigue data come from an uncontrolled pilot. Oral D-ribose lowers blood glucose and raises insulin within an hour, which matters for people on diabetes drugs.
Key facts
- 153 adults with HFpEF: 15 g/day D-ribose alone improved KCCQ symptom score, ejection fraction and BNP versus placebo over 12 weeks[2]
- Single doses of 2.5–10 g lowered serum glucose by up to 26.3 mg/dL (30.3%) within 60 minutes, with a dose-related insulin rise[3]
- A Cochrane review of McArdle disease treatments found no benefit from D-ribose and notes diarrhoea and hypoglycaemia-like symptoms (light-headedness, hunger) with oral ribose[8]
- 6 graded human outcomes on this page
- October 13, 2026
How it works
ProposedRibose forms the sugar backbone of ATP and other nucleotides. Supplying it is proposed to speed ATP rebuilding in heart and skeletal muscle after ischaemia or hard exercise. Oral ribose is absorbed within 18–30 minutes and triggers an insulin response, which lowers blood glucose.[3][5][1]
What the human research says
Human trials only, one row per outcome. The form column shows what each trial actually tested. Grades follow our evidence-grading policy.
At a glance: strongest evidence per outcome
| Outcome | Grade | Effect | Strongest evidence | Rows |
|---|---|---|---|---|
| Heart failure | Grade D | Improved | RCT · n = 153 · 2022 | 1 row |
| Fatigue | Grade D | Improved | Open-label · n = 41 · 2006 | 1 row |
| Exercise | Grade D | Mixed | Crossover RCT · n = 26 · 2017 | 4 rows |
Every graded row
| Outcome | Effect | Grade | Best evidence | PMID |
|---|---|---|---|---|
| Symptoms, ejection fraction and BNP in heart failure with preserved ejection fraction | Improved | Grade D | RCT · n = 153 · 2022 Adults aged 50 and over with HFpEF (USA); 4 arms, 37 on D-ribose alone Form: D-ribose powder · Dose: 15 g/day (alone or with 600 mg/day ubiquinol) · Duration: 12 weeks Versus placebo, D-ribose alone improved KCCQ clinical summary score, ejection fraction and BNP; 6-minute walk distance and septal E/e′ did not change. | 35644694 (opens PubMed)Source [2] |
| Energy, sleep, pain and well-being in fibromyalgia or chronic fatigue syndrome | Improved | Grade D | Open-label trial · n = 41 · 2006 Adults with fibromyalgia and/or chronic fatigue syndrome (USA) Form: D-ribose · Dose: 5 g three times daily (15 g/day; 280 g in total) · Duration: 280 g in total (about 19 days at 15 g/day) All five symptom scales improved; about 66% of patients improved significantly, with energy up 45% and well-being up 30% on average. | 17109576 (opens PubMed)Source [1] |
| Power output, exertion and muscle damage over repeated exercise days | Mixed | Grade D | Crossover RCT · n = 26 · 2017 Healthy adults split by fitness level (USA) Form: D-ribose versus dextrose · Dose: 10 g/day · Duration: 5 days (2 loading + 3 exercise days) In less-fit participants, mean and peak power rose and perceived exertion and creatine kinase were lower with D-ribose than dextrose; no differences in fitter participants. | 29296106 (opens PubMed)Source [5] |
| Muscle soreness after plyometric exercise | Improved | Grade D | RCT · n = 21 · 2020 Untrained male college students (China) Form: D-ribose solution · Dose: 15 g at 5 time points around exercise (1 h before to 36 h after) · Duration: 2 days around one exercise session Soreness at 24 and 48 hours was lower than in the D-ribose group's own first session; at 24 hours creatine kinase, LDH, myoglobin and malondialdehyde were lower than placebo. Muscle strength and antioxidant markers did not differ. | 32778175 (opens PubMed)Source [6] |
| Anaerobic capacity and metabolic markers in cyclists | No effect | Grade D | Crossover RCT · n = 12 · 2005 Moderately trained male cyclists Form: Ribose with folate · Dose: 3 g ribose (plus 150 µg folate) before and during exercise · Duration: Single session No effect on repeated 30-second sprint performance or adenine nucleotide breakdown. | 16521849 (opens PubMed)Source [7] |
| Sprint power (three 30-second Wingate tests) | No effect | Grade D | Crossover RCT · n = 11 · 2006 Men (USA) Form: Ribose · Dose: 625 mg before exercise · Duration: Single dose No differences in peak power, mean power or power decline versus placebo. | 16937963 (opens PubMed)Source [4] |
Forms
| Form | Elemental % | Absorption (human data) | GI tolerance | Studied for |
|---|---|---|---|---|
| D-ribose powder (dissolved in water) | Varies[3] | Peak blood levels at 18–30 minutes; exposure rose more than proportionally with dose and fell 41–65% when taken with a meal; 4–7% appeared in urine.[3] | Generally well tolerated at 2.5–10 g single doses; diarrhoea and hypoglycaemia-like symptoms have been reported.[3][8] | Heart failure (15 g/day), fatigue (15 g/day) and exercise trials (0.6–15 g) |
Studied doses
Doses studied in human trials ranged from single 625 mg and 3 g doses before exercise (no effect) to 10 g/day for 5 days and 15 g/day for about 3 weeks (fatigue pilot) or 12 weeks (heart failure).[4][7][5][1][2]
Interactions
Published interactions only: each row cites a source. No row means none was found in our sources, not that a combination is safe.
Medicines
- Diabetes medicines (risk of low blood sugar)PK studyOral D-ribose lowered serum glucose by up to 26.3 mg/dL within an hour and raised insulin in healthy adults; hypoglycaemia-like symptoms were reported in McArdle disease trials. Adding it to glucose-lowering drugs could deepen lows; not studied in people with diabetes.[3][8]
- Other glucose-lowering agentsPK studyAdditive glucose lowering is possible given the measured drop in blood glucose; no combination data.[3]
Who should be careful
- People with diabetes or prone to hypoglycaemia
- D-ribose lowers blood glucose and raises insulin within an hour; anyone on insulin or sulfonylureas should monitor closely and talk to their prescriber.[3][8]
- Before surgery
- Because of its blood-sugar effect, people should tell their surgical team they use it; no ribose-specific surgical data exist.[3]
- Pregnancy, breastfeeding and children
- Trials enrolled adults only, so there are no safety data for these groups.[1][2][3]
- Sensitive digestion
- Diarrhoea is a reported side effect of oral ribose.[8]
Talk to your pharmacist or clinician before starting a supplement, especially if you take prescription medicines.
How to read the label
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Frequently asked questions
Does D-ribose help heart failure?
One 12-week trial in HFpEF found 15 g/day improved symptom scores, ejection fraction and BNP versus placebo, but walk distance did not change. It needs confirmation.[2]
Does it boost exercise performance?
Not at small doses. 625 mg and 3 g did nothing for sprints; 10 g/day helped only less-fit people in one crossover study.[4][7][5]
Does it help chronic fatigue or fibromyalgia?
An uncontrolled 41-person pilot reported better energy and well-being, but there was no placebo group.[1]
Is D-ribose safe for people with diabetes?
Caution is needed: it lowered blood glucose by up to 26 mg/dL within an hour in healthy adults, so it could add to insulin or sulfonylureas.[3]
Sources
- [1]The use of D-ribose in chronic fatigue syndrome and fibromyalgia: a pilot study.. J Altern Complement Med, 2006. open-label
- [2]Effects of Ubiquinol and/or D-ribose in Patients With Heart Failure With Preserved Ejection Fraction.. Am J Cardiol, 2022. RCT
- [3]Evaluation of D-ribose pharmacokinetics, dose proportionality, food effect, and pharmacodynamics after oral solution administration in healthy male and female subjects.. J Clin Pharmacol, 2014. PK-study
- [4]Effects of ribose as an ergogenic aid.. J Strength Cond Res, 2006. crossover-RCT
- [5]The influence of D-ribose ingestion and fitness level on performance and recovery.. J Int Soc Sports Nutr, 2017. crossover-RCT
- [6]Effect of D-ribose supplementation on delayed onset muscle soreness induced by plyometric exercise in college students.. J Int Soc Sports Nutr, 2020. RCT
- [7]Effects of ribose supplementation prior to and during intense exercise on anaerobic capacity and metabolic markers.. Int J Sport Nutr Exerc Metab, 2005. crossover-RCT
- [8]Pharmacological and nutritional treatment for McArdle disease (Glycogen Storage Disease type V).. Cochrane Database Syst Rev, 2014. systematic-review
What changed
- Independent adversarial review: maker funding disclosed: the 2017 exercise-recovery trial was funded by Bioenergy Life Sciences (D-ribose supplier); heart-failure trial now notes it was stopped early (153 of 276 planned randomised; 139 completers) and NIH-funded; DOMS row corrected: soreness was a within-group comparison, while CK/LDH/myoglobin/MDA were lower than placebo; McArdle Cochrane review now also states it found no benefit from D-ribose.
- Second-pass self-review: every PMID re-checked against NCBI esummary (title, year, no retraction or expression-of-concern flag), every dose, n and duration re-read against the PubMed abstract or PMC full text, grades held conservative, and interactions limited to what a cited source supports.
- First draft. Source titles and years taken from NCBI E-utilities esummary; abstracts read for every evidence row.