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The thin tissues under the tongue and inside the cheeks allow certain compounds to enter the bloodstream directly
However, once opened, the vial should be used within 28 days to maintain safety and efficacy, after which it should be discarded
When tissue is damaged by injury, inflammation or oxidative stress extracellular matrix proteins (notably collagen and SPARC) are broken down, releasing peptide fragments including GHK
DOI: 10.1172/JCI5461
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