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It's also required for the body to properly metabolize fats and proteins into usable energy, which is why low B12 levels are so often linked to fatigue

Williams gynecology (4th ed.)

Research has also shown that Covid-19 vaccines effectively protect us against the current dominant Covid-19 strain the Delta variant

Berlin R, Berlin H, Brante G, Pilbrant (1978) Vitamin B12 body stores during oral and parenteral treatment of pernicious anaemia