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If your high B12 is from supplements or injections, stopping or reducing the dose will allow levels to return to normal over weeks to months
Clinical ophthalmology (Auckland, N.Z.) , 1 (3), 201207
Berlin H, Berlin R, Brante G (1968) ORAL Treatment of pernicious anemia with high doses of vitamin B12 without intrinsic factor
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Vitamin B12 is one of the B vitamins
With an impaired immune system, the liver will become depleted from B12 reserves very rapidly
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