This lactic acid product smells wonderful like lemon 🍋 and goes on smooth. It can sting and I would recommend applying it after your nighttime oil or serum. I usually put it on after my oil to dampen any tingle.
It is expensive at $88 a bottle but I figured I had some beauty cash and I would finally try it. It does seem to be helping with my dark marks and is keeping my acne at bay with only a few whiteheads now and then. The 30 mL bottle used nightly will last you about two months give or take a week.