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Patel: Ill answer this last question first, and then Ill tell you about the stories in the book afterwards

Despite the common belief that B12 injections should leave you feeling energized and revitalized, some individuals experience the opposite effect

Led by researchers at NYU Grossman School of Medicine, the study reveals key details about how cells process fuels like carbohydrates and fats (metabolism), and how cysteine depletion affects tissues

Vitamin B12 plays an important role in metabolism by helping your body turn carbohydrates (the main source of energy in the body), fats, and proteins into glucose (a type of sugar) for energy

Other products in your routine can either support or undermine its effects

Mol Nutr Food Res 52:12351246 Stuss M, Michalska-Kasiczak M, Sewerynek E (2017) The role of selenium in thyroid gland pathophysiology