This doesnt mean never using physical exfoliation while using retinol, but it requires careful consideration
A 2022 review notes that much of the previous research on collagen supplements has reported no side effects
Dodd S, Dean O, Copolov DL, et al
10.1021/nn406223e 61 WuJ.QinZ.JiangX.FangD.LuZ.ZhengL.et al (2022)
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For example, genetic polymorphisms in GSTs, GCL, and selenoprotein genes were shown to influence mercury body burdens among heavy fish consumers (measured as erythrocyte total mercury levels), as well as urine and hair mercury levels among dental professionals