The vitamin c serum is like finding the fountain of youth. This serum was the perfect solution for my dry aging skin.When used after exfoliation, my skin was brighter and firmer. My skin tone was more even. Even the dark circles under my eyes which I thought were hereditary began to slowly disappear. My husband was the first one to notice and comment on my "radiant skin." After have used high even products for years with little improvement in my skin, I was skeptical about using the vitamin c serum. However, the product was remarkable. The serum did not irritate my sensitive skin, I love the way my skin looks and feels!