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Potential mild effects observed in animal and in vitro models include transient fatigue, mild nausea, or digestive discomfort related to metabolic acceleration

Vitamin B12 injections are far from the only way to get vitamin B12

doi:10.1016/j.jacc.2015.06.007 3.Grodin J, Verbrugge F, Ellis S, Mullens W, Testani J, Tang W

[8] In addition, drugs that affect blood cell production, such as certain chemotherapy agents or some HIV medications, may blunt the benefits of vitamin B or alter blood counts

If youre taking vitamin B12 supplements in addition to the vitamin-rich foods youre consuming, you could experience diarrhea, nausea, vomiting and headache