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Your GP agrees to a blood test

doi: 10.1038/ni.2631 67 VerschoorANeuenhahnMNavariniAAGraefPPlaumannASeidlmeierAet al

On the other hand, individuals with a slower metabolism or mild deficiency might experience prolonged benefits

Volume of Vitamin B12 Laboratory Tests in Ontario for Fiscal Years 2005/2006 to 2010/2011

B-12 deficiency is more common than most people realize, affecting around 6% of Americans younger than 60 and around 20% of those older than 60, though the exact numbers vary
