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An injection can be directly administered into the body which can then be better absorbed and processed with greater efficiency

If youre taking B12 supplements, make sure they are sublingual as it then bypasses the digestive tract and is absorbed directly into the bloodstream

Needle size matters because it decides which layer of tissue the B12 reaches, how comfortable the injection is, and how cleanly it goes in

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However, if youre highly deficient, you may feel tired for a short period as your body adjusts