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& Cheng, A
GHK-Cu is a naturally occurring copper peptide found in human plasma, saliva, and urine, with plasma levels that decline from approximately 200 ng/mL at age 20 to 80 ng/mL by age 60
That said, sometimes lifestyle changes aren't enough to raise glutathione levels, especially if you're dealing with higher oxidative stress, inflammation, or conditions like insulin resistance or liver disease
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