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Biessels, G
Look for HPLC purity above 98%, confirmed peptide molecular weight by mass spectrometry (intact GHK-Cu complex is approximately 340 Da), copper content by ICP-MS, and absence of residual solvents
You will see an instant brightening effect, but long-term changes like fading dark spots take 68 weeks
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doi: 10.1002/ptr.8193 15 GravandiMMAbdianSTahvilianMIranpanahAMoradiSZFakhriSet al
This product is supplied as a lyophilized research peptide , not as a cosmetic or topical serum
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