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Energy and Metabolism High AbsorptionVitamin SupplementSwanson brings you a breakthrough in vitamin B12 supplementation with methylcobalamin the biologically active form of B12. Traditional B12 supplements give you cyanocobalamin a form that the body must convert into methylcobalamin to harness its neuro-nourishing potential. Our methylcobalamin completes this conversion for you so your body gets more active B12 faster for the health of your entire nervous system.