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Itching and skin rash are among the most common
They belong to different drug classes, work through different biology, are approved for different durations of use, and sit at opposite ends of the cost spectrum
doi:10.1111/cts.13142 212
Collagen comparison (thigh skin, 12 weeks): GHK-Cu improved collagen production in 70% of treated subjects, compared to 50% for vitamin C cream and 40% for retinoic acid (PMID 26236730)
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