I've been using this product for about four months now, and there is a vast improvement in the appearance of my skin! I can tell when I don't use it for a couple of days. This BHA power liquid dissolves my blackheads and accelerates skin cell turnover, leaving me with glowier, softer skin. It's quite gentle - even using this in conjuction with the AHA liquid, I rarely overexfoliate or feel tight/dry. Recommended, especially in conjuction with the COSRX AHA liquid!