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Injectable vitamin B12 allows direct absorption and is commonly used by individuals with low or deficient B12 levels or those seeking an alternative to oral supplementation
These effects are generally no more bothersome than what you might feel after a flu shot or a routine blood draw
When liver cells are damaged by alcohol, viral hepatitis, fatty liver disease or cirrhosis, stored B12 leaks into the bloodstream and the liver clears haptocorrin less efficiently
Thyroid concerns arose during drug development due to C-cell hyperplasia and medullary thyroid carcinoma seen in rodent studies
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