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At a molecular weight of approximately 340 Da as the free tripeptide (see the GHK-Cu compound overview), it sits below the 500 Da threshold commonly associated with good dermal penetration a key reason GHK-Cu topical serum formulations achieve dermal absorption where many larger cosmetic peptides do not
New England Journal of Medicine, 384(11), 989-1002
It is not intended for human or animal consumption, nor for diagnostic or therapeutic use.
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