Didn't seem to do much for acne scars. Guess it's not really formulated for that, but it did improve the texture and tone of my skin.
It depends on how dark your acne marks are. My were pretty red. It did not make them disappear completely, but the other scars that weren't as red lightened up. You will probably see a big difference the first week or two of using the serum. After that there won't be anymore noticeable difference. If you have early signs of again and brown spots it will fade them. I had a light brown spot on my forehead from tanning too much. The brown spot wasn't that noticeable so by using the serum it did vanish.