After a month os use, this has helped me a lot with my hiperpigmentation, I can cleary see the effects. But on the other side, it gave me blackheads... I don't see many people with this problem on the reviews of this product or AB communities, but with a google search I found out blackheads are not an uncommon problem with Vit C serums in general, not this product in particular, the solution seems to be using less product. Because of that, after the first month, I stopped using this for about 3 weeks, and started again when my skin cleared from blackheads.

Other than brightning, I haven't experimented more benefits. Good results are supposed to be more evident after six months, so I haven't lost hope on this product lol.