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It is created in a lab and makes it one of the most stable forms of B12

These results help you and your doctor figure out if your issue is likely dietary or something more complex

In elderly patients with renal disease, methylmalonic acid accumulates so levels in urine, like serum, are elevated leading to a decreased specificity for B12 deficiency

Potential Side Effects While Vitamin B12 injections are generally safe, some people may experience mild side effects, including: Pain or redness at the injection site Mild diarrhea Itching or rash Headache Dizziness Severe allergic reactions are rare but require immediate medical attention

Or are they more sporadic and variable, often changing in form and frequency (hyperactivity)