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For more on where B12 comes from and how to increase your intake through food, you can read our short guide on the best dietary sources of B12

Administration Routes Discussed in Medical Literature Administration routes discussed in the literature include oral study tablets, intravesical administration, intra-articular injection in a clinical report, and IV or IM administration in animal pharmacokinetic studies [10] [12] [13] [14]

Vitamin B12 is not a substitute for folic acid and since it might improve folic acid deficient megaloblastic anemia, indiscriminate use of vitamin B12 could mask the true diagnosis

The preprint did not indicate whether these findings were statistically significant

The reason to show it long-hand rather than just stating the answer is that on the 10 mg vial the draw is tiny, and a reader who understands the chain can catch an error the moment a number looks wrong