This has been a holy grail in my skincare routine for a while now. I use this after my treatment (usually niacinamide) and before my moisturiser. I researched into it and it is perfect to pair with niacinamide and most other serums. Leaves my skin hydrated and I do feel as though it is restoring my damaged skin barrier. cos rx is a great brand as well, Korean skincare is where its at!!!