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A separate comparative study - measuring actual collagen production via skin biopsies - found that 70% of women using GHK-Cu showed increased collagen production after one month, compared to 50% for vitamin C cream and 40% for retinoic acid cream
Garca Prado E, Garca Gimenez MD, De la Puerta Vsquez R, Espartero Snchez JL, Senz Rodrguez MT (2007) Antiproliferative effects of mitraphylline, a pentacyclic oxindole alkaloid of Uncaria tomentosa on human glioma and neuroblastoma cell lines
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