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These include: Increased energy levels and reduced fatigue Improved memory, concentration, and mood Healthy red blood cell production Prevention of nerve damage Support for healthy skin, hair, and nails Boosted immune system function

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Acknowledgments We thank the study participants, and the investigators and study site staff who conducted the study

The thigh is best and most advisable for anyone who is self-administering a B12 shot

When comparisons were made, all relevant treatment groups were included

B12 shots deliver a single nutrient, vitamin B12, in one specific form such as cyanocobalamin or methylcobalamin