i have been using this serum for about a month now, and it has changed my skin in the best way possible. for reference, i have oily combination skin. after i started using this, i had no break outs at all. i know it’s only been a month but as someone that has new acne break outs every week, this has been a huge improvement for my skin. i doesn’t sting and of course it is unscented so i highly recommend this for sensitive and combo skin babes out there. my routine consists of a the soon jung whipped mild cleanser, this, the cosrx snail mucin essence and the soon jung hydro barrier moisturizer. i hope this helps!!