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One cited study of 20 women found new collagen production in 70% of those treated with Cu-GHK after one month, compared with 50% for vitamin C and 40% for retinoic acid [2]

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Another meta-analysis study of 12 randomized controlled trials involving non-dialysis patients revealed that biotic supplements did not significantly reduce the serum creatinine levels compared to the placebo group (Liu F

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