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One for drawing and injecting the BAC water into the vial, and a separate one for administering your research doses

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Further Reading For additional peer-reviewed research on this topic, see: PubMed research on GHK-Cu gene expression and NIH review of copper peptide wound healing mechanisms

only the composition per vial differs

If you notice the stopper surface deteriorating or if the vial no longer holds vacuum (you don't hear a slight hiss when first puncturing), replace the vial or transfer contents to a fresh sealed container

Efficacy and absorption issues: Glutathione supplements have limited ability to pass through the digestive tract and be effectively absorbed