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How Long Do the Effects of B12 Shots Last
Long-term safety is unknown
We typically recommend weekly injections for the first month, and then monthly maintenance injections after that
A 2020 study of "wellness" B12 injections in non-deficient adults found no improvement in energy, mood, or cognitive function versus placebo at 4 weeks (Wolffenbuttel et al., Nutrients , 2020)
But whether you suspect that youre low on B12 or youre currently in remission from a B12 deficiency, waiting for symptoms to dissipate can feel frustrating
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