First of all, pure vitamin C serums are either clear or very pale. This one was a dark orange which means the vitamin C has oxidised and is of no benefit to the skin at all. Second, Its consistency is oily and sticky, It leaves a sticky residue, like a film on the face which leads me to believe it isn’t a professional serum, and majority of the product is just GLYCERIN. Third, It doesn’t do what it says, (mostly because the vitamin C was oxidised already, but even the rest of the ingredients had absolutely no effect, which just goes to prove the main ingredient is plain old glycerin) Fourth, It clogged up and also ENLARGED the pores on my nose in one day! Fifth, for the price there are much better Vitamin C options out there. (like The Ordinary, for instance) Very Disappointing.
Update: My skin hasn't broken out in years, and this also made my skin breakout in painful acne.