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In smokers, a single dose of the xanthine oxidase inhibitor allopurinol restores the acetylcholine-induced endothelium-dependent relaxation response in forearm arteries to nonsmoker levels but does not affect the endothelium-dependent relaxation response in nonsmokers [73]
The B12 intake for most Americans is well above the RDA
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Vitamin B12 deficiency from the perspective of a practicing hematologist
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