This serum is by far the best vitamin C serum I have ever come across. Not only is it extremely affordable it is also very effective. This little guy has helped me with my hyper pigmentation on my cheeks that was leftover by severe acne. It also makes my skin incredibly smooth which is an added bonus! The only downside to this product would be that it leaves a sticky finish as some others have been complaining about. I can easily overlook it though. I would not go a day without this serum. A definite must-have!