are b12 injections or tablets better vs Oral Supplements: Which more effective? Vitamin B-12 Injections Vs Oral
Description
This phenomenon is predominantly caused by cobalamin release during hepatic cytolysis and/or decreased cobalamin clearance by the affected liver

People with Crohns disease or celiac disease might not absorb B12 well

(2019) 6:e82130

Did the pharmacy make a mistake

Genuine symptoms directly attributable to B12 overdose are poorly documented and exceptionally rare
The pattern is dose-dependent in community reports