side effects of vit b12 injection Feeling worse after Injection: Answering concerns Are There Any Side Effects
Description
If you still think B12 is just about haematology or even haematology and neurology then you are woefully under-educated

Chemical Society Reviews

Unlike B12 deficiency, which produces recognisable neurological and haematological symptoms, excess vitamin B12 typically remains asymptomatic and is discovered incidentally during routine blood tests
Even some common medications, particularly those for managing acid reflux or diabetes, can interfere with this process over time
