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Pignon JP, Tribodet H, Scagliotti GV, Douillard JY, Shepherd FA, Stephens RJ, et al
& Ju, J

Enhancing Retinols Effects with GHK-Cu GHK-Cu is a game-changer when it comes to enhancing the effects of retinol in skincare

However, Instead of a single change point, they reported three slopes resulting in two change points and three subgroups
