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Lyophilized preparations should remain sealed and stored at -20C away from light and moisture
Chemosphere 184, 747752
The Human Tripeptide GHK-Cu in Prevention of Oxidative Stress and Degenerative Conditions of Aging Oxidative Medicine and Cellular Longevity GHK-Cu levels decline from 200 ng/mL at age 20 to 80 ng/mL by age 60
If you're concerned about purging, starting with a copper peptide moisturizer rather than a serum provides a gentler introduction
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