The COSRX BHA Blackhead Power Liquid makes my skin smoother, but the pore-shrinking effect is really temporary. Like really temporary. Maybe I just have to keep using it. Also I can only use it every four days, which I don't mind. If I use it too often then my face ends up hurting and feeling raw, which obviously means I exfoliated too often. I'm pretty sure it's not breaking me out... However I can get closed comedones with this, and those have a tendency to progress to cystic acne. I suspect I'm sensitive to the niacinamide in the product. The niacinamide is a pretty low percentage though, so it's not as bad as the Galactomyces Essence. Otherwise I do like this exfoliant and I'm happy when it's time to use it again lolll.