I used this previously and it really helps even out my skin tone. I have issues with PIH and this serum has significantly helped fade it out. Now, be aware that this is a L-AA Vitamin C serum, which is pretty unstable. So it oxidizes pretty quickly. I received this with little/no oxidation as can be seen with the clear liquid that comes out of it. To further slow down the oxidation process, I decanted it into an opaque airless bottle and keep it in the refrigerator.