According to Healthline , like almost anything your ingest or inject in your body, when getting B12 shots, there is also a possibility that you may experience an allergic reaction or sensitivity
However, low levels are rare in most healthy adults because the human liver stores vitamin B12 over time
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For adults, its about 2.4 micrograms of B12 daily
The review confirmed that glutathione peroxidases detoxify peroxides by a reaction coupled to GSH oxidation to GSSG with GSSG converted back to GSH by glutathione reductase and NADPH
Conclusion In recent years, research has unearthed a number of vitamin B12 side effects, including positive effects, such as its ability to improve energy levels, enhance mood and keep your heart healthy, and negative effects that may occur when theres too much in the body