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Vitamin B12 injections are an extremely effective method of treating Vitamin B12 deficiencies and many people receive regular injections both through the NHS or privately
Studies have demonstrated that daily oral administration of crystalline cyanocobalamin effectively normalizes serum cobalamin levels in deficient patients, although it is unsuitable for rapid supplementation in cases of severe deficiency due to the limited passive absorption
doi:10.1016/S0140-6736(13)62674-4
B12 is often added to IV therapy visits, and many patients schedule a B12 shot the week between their IV appointments
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