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It is extremely difficult to have too much B12 in your system

Research References CITATION NOTICE: The following references represent published scientific research conducted in controlled laboratory and preclinical settings
Results Eleven patients had a history of gastrectomy and 11 did not
A 2.5mg dose is 25 units

If not it could simply be the type you injected which will not be in your system for too long

doi: 10.1016/j.scr.2010.11.003