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For example, dogs who cannot absorb Vitamin B12 in their intestines do not respond to oral vitamin B12 supplementation

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

Quickstart Highlights GHK-Cu is a naturally-occurring copper tripeptide glycyl-L-histidyl-L-lysine bound to copper(II) that the body produces and that declines with age [1] [2]

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Take high-quality photographs of your scalp from multiple angles including crown, hairline, and sides