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People who have Allergies to methylcobalamin or cyanocobalamin liver or kidney disease If you have Eye issues like Lebers disease A recent infection If consuming bone marrow medication You should consult your medical consultant or doctor about the above conditions before getting B12 injections

References [edit] "Inorganic Cyanide as Protecting Group in the Stereospecific Reconstitution of Vitamin B 12 from an Artificial Green Secocorrinoid" (PDF)

Now, compare that to children from other places: Although American teenagers have similar normal B12 levels in females and males to Turkish teenagers in Konya, B12 levels swing wildly across other countries

Lot tracking allows recall management if quality concerns arise