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People who don't get enough of the essential vitamin can experience nausea, fatigue, dizziness or depression among other symptoms

[DOI] [PubMed] [Google Scholar] 109.Chang C.H., Tsai W.C., Lin M.S., Hsu Y.H., Pang J.H.S

Pill capsules and gummies are commonly available oral options

The two strategies are therefore not substitutes, and they have very different evidence profiles

Key Takeaways: B12 shot effects stay for about one to two weeks Some people notice benefits lasting up to a month If absorption is an issue, weekly injections might be necessary Energy, mood, and metabolism can improve at different paces Your past health impacts how long the effects stay