b12 injection cause headache After Shot: Why It Happens & What to Do Why do I feel worse
Description
This study was supported by grants from the National Natural Science Foundation of China (Grant No

Individuals diagnosed with pernicious anemia, a condition where the body cannot absorb B12 from the digestive tract, are prime candidates for these injections

These meds can lower your bodys B12 levels by affecting absorption, so you might need to take a B12 supplement to keep those red blood cells in tip-top shape
doi: 10.2119/molmed.2008.00108