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Description
The FDA label includes a boxed warning regarding thyroid C-cell tumors observed in rodent studies, contraindicating use in patients with personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2

The Nutrition Source
Assessing vitamin B12 absorption and bioavailability: Read the label

If someone has a serious B12 shortage, it might take several doses to feel energized again
