I have used probably a couple dozen brightening/fading serums in my lifetime and hands down, this one is the best. Within 2 weeks my PIH is GONE gone and I'm glowing! No greasy vit c feeling, pairs well with makeup and doesn't oxidize in 2 days! I just ordered my second bottle as well as the toner pads & essence. If you have hyperpigmentation or just want an amazing glow get it!