what's in a vitamin b12 injection Are Shots Right for You? B12 Shots vs. IV Infusions:

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Taking in extra B12 through injections or supplements when your levels are already normal will not provide additional benefits

Clinical studies specifically monitoring glucose metabolism through oral glucose tolerance tests found no significant changes in glucose handling, and fasting insulin levels remained stable throughout treatment periods lasting up to 24 weeks

The injection of NAD+ may cause adverse reactions and side effects, such as headache, shortness of breath, constipation, increased plasma bilirubin, and decreased levels of gamma glutamyl transferase, lactate dehydrogenase, and aspartate aminotransferase (10,18)