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Other gauges may also be acceptable

Long-term use of certain medications can also deplete your B12 levels

The Cleveland Clinic reports that 15% of adults over 60 have B12 deficiency, yet many experience unexplained fatigue, pale skin, and rapid heartbeat that doctors often dismiss as stress

Silverstein said he decided to investigate the over-prescribing of B12 shots, because "as an internal medicine resident, I have seen many patients come into the emergency department, and they were getting B12 injections without having a really good reason for it." His study could not determine why family physicians were prescribing it inappropriately including whether it was initiated by the doctor or at the request of the patient