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PDF) Effect of Cigarette Smoking on Serum Homocysteine and Vitamin B12 Levels in Apparently Healthy Male Smokers A large recent study found that older adults with higher blood levels of vitamin B12 tended to experience slower declines in thinking and memory over several years compared with people who had Vitamin B12 Blood Test: Uses, Normal Range, and Results Vitamin B12 Deficiency: Causes, Symptoms, and Treatment
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