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How GHK-Cu Compares to Retinoids, Vitamin C, and Other Anti-Aging Ingredients The 1998 head-to-head trial by Abdulghani measured procollagen synthesis side by side, and the copper-binding peptide outperformed both vitamin C and tretinoin

This is a common consideration in clinical practice

307 (3), G274G285 (2014)

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This study gives information of practical value about which fluorescent proteins to use for in vivo experiments, as well as a tool for researchers to use to evaluate the spectra of different fluorescent proteins relative to their own imaging resources

Any contaminants could introduce their own cardiovascular effects, completely muddying the waters and invalidating your data