how long till b12 injections work Quickly Does a Shot Work? What to Expect Will my B12 Injection Work

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B12 shots work faster than oral sources of B12 and therefore are recommended for individuals who need rapid improvement

Neither route is universally superior

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The Vitamin B12 Shot retains more of the vitamin versus supplements which lose up to 88 percent of the vitamin

doi: 10.1038/s41586-021-03638-5