How can Ginkgo biloba affect blood circulation?

Ginkgo may improve blood circulation. Improvements are documented for patients with insufficient peripheral blood flow (intermittent claudication) taking Ginkgo biloba. Among patients with intermittent claudication that was confirmed by X-rays, both total walking distance and pain-free walking distance increased significantly for those randomized to receive Ginkgo compared to those who received a placebo. However, the ultrasound measure of the rate of circulation through the legs (Doppler index) was unaffected.

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