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Pharmaceutical Research (1999) 6
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In a landmark human trial comparing topical GHK-Cu to vitamin C and retinoic acid (tretinoin), GHK-Cu produced measurable collagen increases in 70% of study volunteers outperforming both comparator treatments (Abdulghani et al., 1998)
10.1002/med.21513 14
doi: 10.3382/ps/pey353 142 ChenXYiZChenGMaXSuWDengZet al
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