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Is GHK-Cu better than retinol for wrinkles

The findings of this in vitro study regarding the negative effects of increasing disc degeneration on the cervical range of motion are consistent with the results of in vivo studies 14,15,16

Psychiatry (2016)

doi: 10.1016/j.expneurol.2009.08.014

Let's break down everything you need to know about these two popular ingredients, from how they work to which one might be right for your skin goals
