Its an old wives tale, says David Heber, M.D., director of UCLAs Center for Human Nutrition
in Cell Metabolism note that SIRT1 activation improves mitochondrial efficiency and promotes a shift toward lipid utilization for energy, which can be especially beneficial in endurance and fat-loss settings (Price et al., Cell Metabolism )
Allergic reactions to B12 shots are rare, Foxx notes, but they can occur
Cardiovascular exercise can be incorporated but is not necessarily superior to resistance training for fat loss purposes
Want to see what B12 can do for you
Research & Education Tool Vitamin B12 Injection Dosage Calculator Enter the vial amount, diluent volume, and target amount to estimate concentration, draw volume on a 1 mL U-100 syringe, and approximate vial yield