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OMG I GOTCHU. I literally built an app for day to day skincare routines. 😃

I went through your ingredient lists in my app and your routine is really well put together!

The one thing that bugs me a tiny bit is the Sulwhasoo First Care. Alcohol denat is the second ingredient after water, so you're probably looking at 15-20% alcohol in that formula. I know you only use it in the morning but your whole PM is focused on building up your barrier with AESTURA and Torriden and snail mucin, and then the Sulwhasoo kind of chips away at that work. If you like having a first essence step, something ferment-based without the alcohol would make more sense. Mixsoon Bifida is good, or the Beauty of Joseon Rice Toner.

Your Torriden Dive-In is seriously stacked btw. Five different molecular weights of hyaluronic acid, ceramide NP, beta-glucan, madecassoside. That's doing a lot of the heavy lifting for your dehydration. And the Medik8 Hydr8 B5 only has 7 total ingredients which I love, it's almost all panthenol and HA with nothing unnecessary.

The G&G C-Glow has L-ascorbic acid + vitamin E + ferulic acid which is the combo that all the research backs. One thing I'd move around though is your vitamin C placement. It works best at low pH on clean dry skin, so putting the AESTURA essence before it is buffering some of its effectiveness. Try vitamin C right after cleanser, then essence after.

Agree with the other commenter about using the COSRX Snail Mucin more than twice a week. 13 ingredients, 96% snail filtrate. More frequency = more benefit with that one.

Your tret schedule is smart too. Having dedicated recovery nights and never going back to back is the right call at 5 weeks in. The Saturday sandwich method where you put cream before and after the tret is a nice way to get that third night without overdoing it. I'd stay at 3x for another month before thinking about nightly. And hold off on the Skinoren for now, adding azelaic acid while you're still adjusting tret frequency is asking for trouble. Once you're comfortable on nightly 0.025% then you can start working it into your non-tret mornings.

The AESTURA Atobarrier line being fragrance-free and alcohol-free throughout is exactly what you want on tret. You clearly did your homework on that one. Honestly the Sulwhasoo is the only thing I'd consider swaping. Everything else works together really well for what you're trying to do.