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Although taking these meds doesnt automatically equal deficiency, your doctor should keep an eye on your B12 levels, especially if youve been taking acid-blockers for longer than a year or metformin for more than four months, according to an article in the journal, American Family Physician (9)
Because of this, I recommend any patient who is symptomatic and has suboptimal levels of vitamin B12 (as defined above) consider a trial of sublingual B12
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