Qualifying medical expenses include the costs of diagnosis, cure, mitigation, treatment, or prevention of disease, and the costs for treatments affecting any part or function of the body.

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Scientists thought for years that the protein's only function was to help shuttle cholesterol around the body.

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In reality, three hours is the upper limit for how long a body can remain in suspended animation and still return to normal function.

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"There is a significant body of scientific and clinical evidence supporting the safety and efficacy of ginkgo extract for both cognitive function and improved circulation, " said Mark Blumenthal, executive director of the American Botanical Council.

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