Been using this for only 2 weeks, and it has made a huge difference I have a lot of acne scarring (dreaded purple splotches!) and within a few days, I noticed them becoming more pink and lighter. Now, after a short time, they are almost gone!
It is possible that darker pigmented spots will take longer, but it certainly worked faster than I expected it to. It does dry the skin, so follow with a really good moisturizer!