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Even if you do not fall into the strict "avoid" categories, you should exercise heightened caution and consult a physician before using GHK-Cu if you: Are currently pregnant or breastfeeding Have a known copper metabolism disorder (like Wilson's disease) Have a history of severe allergic reactions to cosmetics or metals Have significant underlying medical conditions affecting the liver or kidneys How Long Does GHK-Cu Take to Work

What sets GHK-Cu apart in the research literature is scale: naturally occurring levels of the peptide in human plasma decline from roughly 200 ng/mL at age 20 to about 80 ng/mL by age 60, a drop researchers have used as a starting point for studying its potential connection to age-related changes in tissue repair

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CNS Neurosci Ther (2019) 25:46575

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