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Summary: Vitamin B12 toxicity from supplementation is extremely rare, but persistently elevated serum levels may indicate underlying liver disease, kidney dysfunction, or haematological disorders requiring medical investigation

Some of the symptoms of low vitamin B12 can include fatigue, headaches, and burning or pins-and-needles sensation of the hands or feet

Further, heterocycle or heterocyclic ring moiety may be unsubstituted or substituted by one or more groups selected from halogen, haloalkyl, hydroxy, alkoxy, carbonyl, alkylamido, nitro, amino, dialkylamino, carboxy, thio or thioalkyl

Body composition considerations Your body composition can influence which sites work best for you practically, even if absorption remains equivalent