vit C is proven for collagen boosting and natural radiance it also is an effective barrier against sun da,age. regular use of vit C will also reduce sun damage. these are all the reasons i love this serum. At R195 it is well priced when compared to other serums on the market and has a high vit C content of 20% which is great. may not go well with sensitive skins but on my combo skin is a gem.