In addition to a multivitamin, I have been taking vitamin B12 supplements (1,000 mcg) for a few years, hoping to increase my energy. My recent blood profile showed a high level of B12 (1,826 pg/ml). Should I stop taking B12? My energy is about the same.
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The editor in chief of the Harvard Health Letter introduces this year’s edition of a special issue comprised entirely of “By the way, doctor” letters from readers.
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