Finding a spot clearing serum, which does not contain silicons (I am allergic), is one of the most difficult tasks I have ever undertaken. All the other alternatives were so expensive. I was about to give up, when I found Makeup Revolution's Skin Dark Spot Corrector, and my life is forever changed. This serum not only contains Vitamin C, but also Niacinamide, which is an essential when it comes to the effective targeting of blemishes and pores. I noticed changes within two weeks of alternate day usage. Highly recommend.