Stop or reduce vitamin B12 supplements if you are taking them
Review multivitamins, energy drinks, and fortified foods for added B12
Ask a clinician whether your B12 injections or high-dose oral B12 can be adjusted
Repeat the blood test to confirm the result and rule out lab variation
Check for causes of high B12 such as liver disease, kidney disease, inflammation, or blood disorders
Treat any underlying medical condition contributing to elevated B12
Avoid self-treating with additional B12 unless prescribed
Follow up with a healthcare professional for monitoring and guidance