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These recommendations are for the cyanocobalamin form of B12 onlythe form in fortified foods and most supplements
Vitamin B12 deficiency typically becomes clinically significant after several years of continuous metformin therapy, with higher risk in patients taking metformin for more than three years or on doses of 2g or more daily
If youre vegan or mostly plant-based, oral or sublingual B12 is usually enough long term shots are typically for documented deficiency or absorption issues (NIH ODS)
Everyone can benefit from it
Research on 1000 mcg Dosage Effectiveness Studies say Vitamin B12 doses up to 1000 mcg help seniors a lot
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