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This introductory guide will help you recognize that it might be time to contact a medical professional if you are facing symptoms that indicate a B12 deficiency
Image: Peter Dazeley/Getty Images About the Author Marygrace Taylor, Health Writer About the Reviewer Pieter Cohen, MD, Contributor Disclaimer: As a service to our readers, Harvard Health Publishing provides access to our library of archived content
Early warning signs include persistent fatigue that does not improve with rest, difficulty concentrating or brain fog, tingling or numbness in hands and feet, weakness in the legs, dizziness when standing up, pale or yellowish skin, and a sore or swollen tongue
Again, independent third-party COA testing is the minimum standard before considering any product
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