They create energy (ATP), but this process also creates byproducts that can damage the mitochondria themselves
Wang L, Yi H, Liang X, Xu F, Li T, Yang X, et al
J Endocrinol Invest (2017) 40:2817
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doi: 10.1016/0006-2952(84)90598-7
B-12 Vitamin injections have many reported benefits which include: Increased energy levels Boosts your immune system Reduced fatigue Enhances Good Mood and Helps Fight Depression Improved metabolism, which could improve appetite, sleep and energy levels Enhances Healthy Cells in Nails, Hair, and Skin Reduced risk of heart disease, stroke, and other medical conditions Reduced neuropathy (nerve damage) in people with diabetes FREQUENTLY ASKED QUESTIONS WHAT IS B-12