injection b12 intramusculaire Activated Booster Compounded Methylcobalamin (Vitamin B12) Injection,

Neither the NAD+ cohort nor the placebo (saline) cohort experienced any negative side effects throughout the 6 hour infusion (10) At 8 hours following the start of the NAD+ infusion, it was shown that the NAD+ group had significant declines in the liver function enzymes gamma glutamyl transferase, lactate dehydrogenase, and aspartate aminotransferase as well as a large increase in plasma bilirubin (10)

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Its also possible that these associations have nothing to do with vitamin B12 and rather that it is an innocent bystander

Same principle