Even despite the nasty smell (which I can still smell from time to time, even after the product dries on my face), this has done great things for my skin. I incorporated this product a couple of weeks after starting the COSRX BHA, and I would use the AHA two days after the BHA. While the BHA does great things for the size of my pores and the number of blackheads I have, the AHA is better for lightening PIH (dark spots) and as a spot treatment on whiteheads or pimples. When I don't use this, I get a lot of milia and whiteheads under my eyes and on my cheeks. Definitely taking the BHA and AHA every time I travel from now on!