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Journal of Endocrinology and Metabolism, 3(12), 715.

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Frequency of Administration: The Fifth Key Guideline The frequency of B12 injections is key to effective treatment

The same is true of B vitamin complex supplements, which deliver 50 to 500 micrograms (i.e., 20 to 200% of the RDA), as well as for most supplements containing only vitamin B12, which deliver up to 1,000 micrograms (about 400% of the RDA)