Stop or reduce vitamin B12 supplements
Stop multivitamins or energy products containing B12
Review fortified foods and drinks for added B12
Limit intake of animal-based foods high in B12 if advised by a clinician
Avoid unnecessary B12 injections or high-dose oral B12
Check all medications and supplements for hidden B12
Re-test B12 levels after changes
Consult a healthcare professional before making major dietary changes