Supplement analysis backed by scientific evidence · PT

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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.

Evidence last reviewed: August 2026

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.

Scientific references

Where to buy

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