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Jiang Z, Shen H

The lack of biomarkers constitutes another central bottleneck

Some studies suggest that GHK-Cu fragments or metabolites might still have biological activity even if the intact peptide is not fully absorbed

However, despite recent reports of off-label uses that have popped up in the news over the past few months, the only FDA-approved use for methylene blue is for the treatment of methemoglobinemia, a rare condition that restricts the ability of red blood cells to deliver oxygen throughout the body

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