I have combination and blemish skin. I choosed this Vit. c source as it has a lot of reviews and good price. This is my first experience of using an active form of Vit. c (ascorbic acid). Some time ago I tried vit c serum from Instanatural (stable derivative of Vit. C) and it do nothing with my postacne scars. Consequently, highly recomend to use Tiam Vit. C in nightime skincare routine and don't forget about SPF.