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In human plasma, the GHK concentration is approximately 200 ng/mL at the age of 20, but declines to around 80 ng/mL by the age of 60
Zhang B, Cheng Z, Chen J, Zhang X, Liu D, Jiang H, et al
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With fewer sebaceous glands and lower baseline collagen turnover, expect a 30% to 40% improvement in wrinkle depth for mild-to-moderate photodamage over 12 to 16 weeks
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[PMID: 3833385] PubMed record related to this compound for laboratory literature review
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