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Heat and freezing are not, and both can end a vial's usable life well before its printed date
Oral vitamin B(12) versus intramuscular vitamin B(12) for vitamin B(12) deficiency
Contact your doctor as soon as possible if you experience any new or changing symptoms after using vitamin B12 injections or supplements
This occurs through multiple mechanisms
18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms
Retrieved 15 February 2018
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