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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
Both metformin and long-term use of proton pump inhibitors have been linked to reduced B12, and the same goes for many people past 50
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What to Expect Before Your Procedure Pre-Treatment Instructions Vitamin B12 injections require minimal preparation
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