vitamin b12 replacement side effects injection B12: Overdose and Vitamin B12 Deficiency - Harvard
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From there, your GP can help you work out what support makes sense

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if you take warfarin or a related drug, your clinician may schedule extra clotting-time tests

Nasal administration is not well studied, 1 and the difference in effect on B12 levels amongst individuals may be due to the route of administration
Cobalamin and cobalamin-binding capacity in human milk

For severe vomiting, lethargy, or prolonged symptoms, seek immediate vet attention
