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Vitamin B12 injections begin working at a cellular level almost immediately after administration, though the timeframe for noticeable symptom improvement varies considerably between individuals

Most people feel a lift after a B12 shot, but a minority feel briefly worse

Within 24 to 48 hours : For others, it may take a day or two to notice a difference

Plus, to learn more about how to check your vitamin B12 status, see: Vitamin B12 Deficiency Test

(PubMed) Almeida OP, McCaul K, Hankey GJ, Norman P, Jamrozik K, Flicker L

If this is something you want to address in your breast lift procedure, be sure to connect with your plastic surgeon about this during your consultation