and Herbert et al.s Research on Multivitamins circa 1980 Potential Improvements in the Accuracy of Nutrition Labeling B12 Transport Proteins and Multivitamins Observational Study of B12 in Fortified Non-Dairy Milks Anecdotal Reports Dangers of Recommending Take a Multivitamin Conclusion Appendix A: Personal Experiment Bibliography B12 Supplement Safety Measuring B12: Why the Confusion
(PubMed) Vogiatzoglou A, Refsum H, Johnston C, et al
Other Drugs : Vitamin B12 can interact with other drugs, such as folic acid, affecting their efficacy or increasing the risk of side effects
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He reports that most vegans show adequate B12 levels to make clinical deficiency unlikely, but they may show restricted activity of B12-related enzymes, leading to elevated homocysteine levels, which has been linked to increased risk of heart disease and stroke