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To help bypass any barriers to absorption in the GI tract, many healthcare providers recommend B12 injections for deficiency, but research shows that very high doses of oral B12 (1,000 to 2,000 mcg once a day) can normalize serum B12 levels to a similar extent with minimal side effects

Vitamin B 12 is essential for three enzymatic processes: the conversion of homocysteine to methionine

In patients with suspected B12 deficiency, initial lab tests should include a complete blood count (CBC) with a peripheral smear and serum B12 and folate levels

Severe B12 deficiency is a health issue, not just feeling tired

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