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How quickly do Vitamin B12 injections start working
Published large human clinical-trial data is not available, so a regulator-grade answer to that question does not exist

M., Rahman, S., Sabico, S., Yakout, S., Wani, K., Al-Attas, O
The largest Phase 2b trial (502 participants, 24 weeks) did not show statistically significant weight loss versus placebo

For weight management purposes specifically , B12 injections are not recommended unless an underlying deficiency is confirmed

I think it was just my own Dave Tilley: Googling