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B12 injections are an effective and rapid treatment for your body to quickly and efficiently absorb the vitamin it needs (NIH, n.d.)

The powder will dissolve completely within a minute or two

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doi: 10.1016/j.jsps.2019.08.001

The treatment duration limit stems from animal safety data

What I would suggest is that you start low at first, and then increase your dosage as your body gets accustomed to it