headache from b12 injection Why Do I Feel Worse After My Injection? Understanding Post-Injecti – Oxford Origins B12 Headache: The Link Between

You will start to feel the effects within 48-72 hours

This is certainly not a good sign

10.1007/s00415-020-09934-w 227

This seems to have taken me back to almost the same as my first rounds

When Re-Testing May be Appropriate Borderline levels: 36 months High levels: 13 months During B12 therapy: Monthly until normalized With new symptoms: As needed Additional Testing Your Doctor May Consider Complete B12 panel Kidney function Absorption testing When Additional Care May be Warranted Persistent high MMA despite supplementation Progressive neurological symptoms Symptoms of severe B12 deficiency (extreme fatigue, difficulty walking) Signs of pernicious anemia (severe macrocytic anemia) Bibliography References 1