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This is why sourcing diligence and independent verification matter for research-grade material
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attributing skin changes to GHK decline specifically is a plausible hypothesis, not a proven mechanism
A CL Member asked if water pitcher filters can remove radium from drinking water
(4) Fangru Jiang, Yanan Wu, Zhe Liu, et al (2023) Synergy of GHK-Cu and hyaluronic acid on collagen IV upregulation via fibroblast and ex-vivo skin tests Journal of Cosmetic Dermatology, 2023 Sep, Volume 22 (Issue 9), Pages 2598-2604
The vertex (crown) often shows different permeability than the frontal hairline, which may explain why some areas respond differently to topical treatments
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