Not sure
Maybe it takes time and after use this product must apply sunblock when going out

Good!
It helps my bigger whiteheads but it takes some time to work.

Really nice

I use it before applying clay mask. First I steam my face to open up the pore, then apply this and the BHA liquid and wait for about 20 min. After that I apply the clay mask. Together they help reduce sebum production and reduce number of blackheads and whiteheads. Note: you will need to use it more than a few times to see results. So be patient if you don't notice immediate difference.

Works well
COSRX BHA gave me chemical burn, so I did not have high hopes for COSRX AHA. To my surprise, I find it quite gentle and it clears most of my white head.

liquid

This did not work well for me as i have very stubborn whiteheads maybe it would work on others.