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The effects of a B12 shot usually last one to two weeks, but the vitamin itself can stay in your system longer

The lyophilized (unreconstituted) powder is substantially more stable than the liquid form

doi: 10.1007/s11356-022-22941-w, 73

10.1002/advs.202204365 80 YinS.-Y.SongG.YangY.ZhaoY.WangP.ZhuL.-M.et al (2019)

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But here are few common signs of vitamin B12 deficiency: Tiredness, fatigue or weakness Numbness or tingling in the hands or feet Memory issues or loss of concentration Constipation Muscle weakness Dizziness NOTE: These are some signs of B12 deficiency that can benefit from a B12 regimen