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ingestible · for chronic fatigue syndrome

D-Ribose

Reviewed by the Nimbera editorial team · Last updated May 2026

An open-label uncontrolled pilot study (n=41 patients with CFS and/or fibromyalgia) found that 5 g of D-ribose three times daily produced significant improvements in all five VAS categories - energy, sleep, mental clarity, pain, and overall well-being - with approximately 66% of patients reporting meaningful benefit and an average 45% increase in energy scores (Teitelbaum et al., Journal of Alternative and Complementary Medicine, 2006; PMID 17109576). The study lacked a placebo control, which limits conclusions.$25-45/month

How to use

Mix 5 g (approximately 1 teaspoon) of D-ribose powder into water, juice, or a smoothie and take three times daily, ideally with meals. A typical trial period is 3 weeks; if no benefit is seen by then, it is unlikely to help. Some practitioners suggest a lower starting dose of 5 g twice daily for the first week to assess tolerance.

How it works

D-ribose is the five-carbon sugar backbone used to synthesize ATP (adenosine triphosphate); supplementation aims to replenish the cellular ATP pool that research suggests is depleted in ME/CFS and fibromyalgia.

Where to buy

Health food stores, online retailers (iHerb, Amazon). Available as an unflavored powder (most economical) or in capsule form. Look for pharmaceutical-grade D-ribose.

Typical cost: $25-45/month

Safety notes

D-ribose can lower blood glucose - use caution if you have diabetes or hypoglycemia and monitor blood sugar carefully. Do not use if you are on insulin or other glucose-lowering medications without medical supervision. May cause mild gastrointestinal symptoms (nausea, diarrhea, bloating) at higher doses. The evidence base for D-ribose in ME/CFS is weak; the key study was uncontrolled and small. Not recommended during pregnancy or breastfeeding. Stop use if symptoms worsen - in ME/CFS, pushing energy metabolism without adequate rest can trigger post-exertional malaise.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Teitelbaum et al., J Altern Complement Med 2006

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.