Condition
Intermittent Claudication
Intermittent claudication is leg pain on walking caused by narrowed leg arteries (peripheral artery disease). The reference treatment is supervised walking exercise, backed by high-quality evidence for longer walking distances, and cilostazol, a prescription drug, also helps. Of the supplements, propionyl-L-carnitine has the best support: moderate-certainty evidence of a mild to moderate gain in walking distance. A Cochrane review found no clinically useful benefit from ginkgo. Walking improved less on long-term oral L-arginine than on placebo. Evidence for omega-3 and vitamin E is very uncertain. Leg pain at rest or a wound that won't heal needs prompt care, and a suddenly cold, pale leg is an emergency.
Sources: PMID 29278423; PMID 29627967; PMID 34192807; PMID 34954832; PMID 23744597; PMID 17592080; PMID 39470212; PMID 10796571; PMID 38877714; PMID 40025885
- Supplements studied
- 4
- Graded outcomes
- 2
- Trials
- 6
- People studied
- 1,221
What the evidence says
- Supervised walking exercise: strong evidence, and the reference point for everything else. In a Cochrane review, exercise programs lengthened pain-free walking by about 82 meters compared with no exercise (9 trials, 391 people), with gains seen for up to two years. A second Cochrane review found that supervised programs, usually three sessions a week, added about 210 meters of maximum walking after three months compared with walking advice alone.
- Cilostazol, for comparison: this prescription medicine lengthened pain-free walking by about 26 meters more than placebo across 6 trials with 1,722 people, with low-certainty evidence. It raised the odds of headache.
- Ginkgo: no clinically useful benefit. A 2013 Cochrane review of 14 trials with 739 people found ginkgo added 64.5 meters of maximum walking on a flat treadmill, a difference that was not statistically significant, and missing negative trials probably inflated even that. An earlier review of 8 trials found about 34 meters more pain-free walking, a modest effect of uncertain clinical relevance.
- L-arginine: the long-term oral trial was negative. In the NO-PAIN trial, 133 people with claudication took 3 g a day or placebo for 6 months. Walking distance improved less with L-arginine than with placebo, and blood vessel function did not improve. The earlier positive trial, in 39 people, gave L-arginine by infusion, 8 g twice a day for 3 weeks, not as capsules.
- Propionyl-L-carnitine: moderate evidence for a mild to moderate gain. A 2021 Cochrane review of 12 trials with 1,423 people found that 1 to 2 g a day lengthened maximum walking by 26% and pain-free walking by 31% more than placebo, with side effects similar to placebo. Many trials were backed by drug companies. Plain L-carnitine is a different form: in one small crossover study of 14 people, propionyl-L-carnitine did slightly better on maximum walking.
- Omega-3 and vitamin E: no clear benefit shown. A 2024 Cochrane review of 15 trials with 1,830 people found omega-3 may make little or no difference to pain-free or maximum walking distance, and the evidence is very uncertain. A Cochrane review of 5 small, generally poor-quality vitamin E trials with 265 people found too little evidence to tell whether it works.
Safety and when to see a clinician
- Ginkgo and blood thinners: a review of 15 published case reports found a possible link between ginkgo and bleeding, including 8 bleeds inside the skull, though 13 of the reports named other bleeding risks. Other case reports describe bleeding when ginkgo was taken with warfarin or aspirin, while controlled studies of one standard extract found no clear effect on clotting. If you take aspirin, clopidogrel, warfarin or another blood thinner, ask your clinician before adding ginkgo.
- Fish oil: across 11 trials with 120,643 people, omega-3 did not raise bleeding overall, and taking an antiplatelet drug made no clear difference. High-dose purified EPA raised the relative risk of bleeding by 50%, a small absolute rise of 0.6%. Tell your clinician if you take fish oil with a blood thinner.
- Vitamin E: in a review of 19 trials, doses of 400 IU a day or more were linked to a small rise in deaths from any cause. In a separate review of 9 trials, vitamin E raised the risk of bleeding strokes by 22%. High doses may add to bleeding risk with warfarin or aspirin.
- Claudication signals artery disease that carries a three- to six-fold higher risk of dying from heart and blood vessel disease. Get a diagnosis and a plan from a clinician first, and don't swap a prescribed medicine for a supplement.
- Leg or foot pain at rest, or a sore or wound that won't heal, can mean chronic limb-threatening ischemia, the end stage of peripheral artery disease, which raises the risk of amputation: see a vascular clinician promptly. A leg that suddenly becomes painful, pale, cold, numb or weak is an emergency: call 911.
Evidence by supplement
- Strong
- Moderate
- Limited
- Very limited
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| Blood Flow Small Increase | Improves (the measure goes up) | Small effect | 1 study | 39 people | ||
| Nitric Oxide | Improves (the measure goes up) | 4 studies | 39 people | |||
Studies that measured nitric oxide
| ||||||
| Intermittent Claudication Symptoms | Changes; see studies | 39 people | ||||
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| High-density lipoprotein (HDL) Small Improvement | Improves (the measure goes up) | Small effect | 39 people | |||
| Low-density lipoprotein (LDL) | Improves (the measure goes down) | 10 studies | 39 people | |||
Studies that measured low-density lipoprotein (ldl) | ||||||
| Total cholesterol | Improves (the measure goes down) | 3 studies | 39 people | |||
Studies that measured total cholesterol
| ||||||
| Intermittent Claudication Symptoms | Improves (the measure goes down) | 1 study | 39 people | |||
Studies that measured intermittent claudication symptoms | ||||||
Ginkgo Biloba
- Intermittent Claudication Symptoms: improves
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| Intermittent Claudication Symptoms | Improves (the measure goes down) | 5 studies | 415 people | |||
Studies that measured intermittent claudication symptoms
| ||||||
L-Carnitine
- Intermittent Claudication Symptoms: improves
| Grade | Outcome | Effect | Size | Studies | People | Studies list |
|---|---|---|---|---|---|---|
| Intermittent Claudication Symptoms | Improves (the measure goes down) | 3 studies | 570 people | |||
Studies that measured intermittent claudication symptoms | ||||||
Key findings
- Blood FlowImproves (the measure goes up)
- High-density lipoprotein (HDL)Improves (the measure goes up)
The Intermittent Claudication Support protocol
2 primary supplements · 3 supporting supplements
- Ginkgo Biloba120–240 mg standardized extract daily
- L-Arginine3–6 g daily in divided doses
Shop the evidence-backed picks
Support alongside medical care. These supplements are not a treatment for Intermittent Claudication. If you are being treated for it, talk to your clinician before adding one: supplements can interact with medicines.
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Studies cited
21 studies from PubMed
- Exercise for intermittent claudication.
- Supervised exercise therapy versus home-based exercise therapy versus walking advice for intermittent claudication.
- Cilostazol for intermittent claudication.
- Propionyl-L-carnitine for intermittent claudication.
- Ginkgo biloba for intermittent claudication.
- L-arginine supplementation in peripheral arterial disease: no benefit and possible harm.
- Omega-3 fatty acids for intermittent claudication.
- Vitamin E for intermittent claudication.
- New Horizons in Peripheral Artery Disease.
- [Acute limb ischaemia].
- Ginkgo biloba extract for the treatment of intermittent claudication: a meta-analysis of randomized trials.
- Restoring vascular nitric oxide formation by L-arginine improves the symptoms of intermittent claudication in patients with peripheral arterial occlusive disease.
- Spontaneous bleeding associated with ginkgo biloba: a case report and systematic review of the literature: a case report and systematic review of the literature.
- Herb-drug interactions: a literature review.
- Potential interaction of Ginkgo biloba leaf with antiplatelet or anticoagulant drugs: what is the evidence?
- Bleeding Risk in Patients Receiving Omega-3 Polyunsaturated Fatty Acids: A Systematic Review and Meta-Analysis of Randomized Clinical Trials.
- Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality.
- Effects of vitamin E on stroke subtypes: meta-analysis of randomised controlled trials.
- Vitamin E (α-Tocopherol): Emerging Clinical Role and Adverse Risks of Supplementation in Adults.
- Lower extremity critical limb ischemia: A review of clinical features and management.
- A systematic review and meta-analysis of propionyl-L-carnitine effects on exercise performance in patients with claudication.