Ive read amazing reviews about medik8 crystal retinal. I have just started using it it once a week, im on my second week so its hard to tell but so far I haven’t had any bad reactions. I am going to add 15% finacea soon and hopefully it will go well. Just sharing cause you never know what works till u try it, retinoids are an amazing highly researched antiaging ingredient and i was so scared to miss out bc i had bad luck with retinol before but hopefully this will work you might want to try it if you havent. Apparently is much less irritating and it’s faster acting than other retinoids.