← All supplements
Limited evidenceHeart & metabolic

Circulation Support Formulas

Blends combining Ginkgo biloba with nitric-oxide precursors such as L-arginine or L-citrulline, sold for cold hands, heavy legs and vascular health. The individual ingredients have been tested; the finished blends have not, and the best evidence for the leg-circulation claim is negative.

Where to buy

View on iHerb

Ships to 180+ countries · welcome discount for new customers

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

What the science says

  • Walking distance in leg circulation problems Limited evidence

    A Cochrane review of 14 randomized trials (739 participants) found that Ginkgo biloba increased pain-free walking distance by about 64 metres versus placebo, a difference that was not statistically significant and likely inflated by publication bias. The authors concluded there is no evidence of clinically significant benefit in peripheral arterial disease.

  • Endothelial function markers Moderate evidence

    A systematic review and meta-analysis of L-arginine supplementation in people with cardiovascular or metabolic disease found improvements in flow-mediated dilation, a marker of blood-vessel function. The effect is on a laboratory marker, not on symptoms such as leg pain or cold extremities.

  • The blends themselves Limited evidence

    No published trial has tested a commercial multi-ingredient circulation formula as sold. Doses of each component in these products are often well below what the trials on ginkgo or arginine used.

Dosage & safety

Studied doseGinkgo extracts were studied at 120–240 mg/day of a standardized (EGb 761-type) extract; L-arginine trials generally used 3–6 g/day and L-citrulline 3–6 g/day. Many blends provide far less of each.
SafetyGinkgo may increase bleeding risk and should be stopped before surgery and used cautiously with anticoagulants or antiplatelet drugs; it has been associated with seizures in susceptible people. Arginine can lower blood pressure and should not be used after a recent heart attack without medical advice. Avoid in pregnancy and breastfeeding. Persistent leg pain on walking is a symptom of arterial disease and needs medical assessment, not a supplement.

How to take it

TimingTake arginine or citrulline 60 to 90 minutes before exercise; ginkgo timing does not matter.
With food?Arginine absorbs better on an empty stomach but causes more nausea and loose stools that way, so with food is the practical compromise.
Worth knowingCheck the label against the studied doses — most blends supply a token amount of each ingredient rather than a working dose of any.

Interactions

With medications

  • warfarin and other anticoagulants or antiplatelet drugs

    Ginkgo increases bleeding risk, with case reports of serious bleeds. do not combine without medical supervision, and stop ginkgo before surgery

  • blood pressure medication

    Arginine and citrulline lower blood pressure and add to the drug effect. monitor your blood pressure when you start

  • nitrates and PDE5 inhibitors such as sildenafil

    Additive vasodilation can cause a large drop in blood pressure. do not combine without medical supervision

  • anticonvulsants

    Ginkgo has been associated with seizures in susceptible people and may reduce seizure control. avoid ginkgo if you have epilepsy

With other supplements

  • beetroot or other nitric oxide boosters

    Additive blood-pressure lowering. do not stack several at once

  • fish oil, garlic or other antiplatelet supplements

    Additive bleeding risk on top of ginkgo. avoid stacking, especially before surgery

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Do circulation supplements work for cold hands and heavy legs?

Circulation support formulas combining ginkgo with L-arginine or L-citrulline are graded limited: the finished blends have never been tested in a published trial, and the best evidence for the leg-circulation claim is negative. Persistent leg pain on walking can signal arterial disease and needs medical assessment.

Does ginkgo improve walking distance in peripheral artery disease?

A Cochrane review of 14 randomized trials (739 participants) found ginkgo increased pain-free walking distance by about 64 metres versus placebo, a difference that was not statistically significant. The authors concluded there is no evidence of clinically significant benefit from ginkgo in peripheral arterial disease.

How much ginkgo and L-arginine is in an effective circulation formula?

The trials behind circulation support formulas used 120–240 mg/day of standardized ginkgo extract and 3–6 g/day of L-arginine or L-citrulline. Many blends provide far less of each, so check the label against those studied doses.

Are circulation supplements safe with blood thinners?

Ginkgo in circulation support blends increases bleeding risk, with case reports of serious bleeds, so do not combine it with warfarin or antiplatelet drugs without medical supervision and stop it before surgery. Arginine and citrulline also add to blood pressure medication, nitrates and PDE5 inhibitors such as sildenafil.

Scientific references

Related in Heart & metabolic