I would recommend u to start slow & start with low % . u may consider retinol from the inkey list or the ordinary as I heard they r quite gentle. use retinol max 3x times a week ( u may start with once a week first & slowly build up ur skin tolerance, use on dry skin aft cleansing. Rmb not to mix with ingredients like aha/bha or vitamin c, not forgotting daily sun protection too 😇😇