vitamin b12 injection reaction Why Do I Feel Worse After My Injection? Causes & Management – Bolt Pharmacy B-12 Shots at Neighborhood Medical
Description
In addition to excessive intake of dietary supplements, parenteral administration of vitamin B12 may be another cause of excess, which is likely associated with an immune system response to produce anti-TC II antibodies

Its called hemoglobinuria

Injection-site irritation is possible but uncommon

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