Here is my take on B12.. hope you learn something. Eat dead animal! = )
References:
Allen, L. H., Miller, J. W., de Groot, L., Rosenberg, I. H., Smith, A. D., Refsum, H., & Raiten, D. J. (2018). Biomarkers of Nutrition for Development (BOND): Vitamin B-12 Review. The Journal of Nutrition, 148(suppl_4), 1995S-2027S.
Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes (DRIs): Recommended Dietary Allowances and Adequate Intakes, Vitamins. Washington, D.C.: National Academy Press
National Institute of Health. Office of Dietary Supplements – Vitamin B12. (2020, March), from
