With hundreds of studies on the effectiveness of topical Vitamin C on reducing hyperpigmentation, supporting collagen growth and overall skin health by neutralizing free radicals, proving that topical Vitamin C is effective in these areas, oral Vitamin C, on the other hand, is absorbed through small intestines and then circulated through the bloodstream to tissues all around the body, including the skin. 

Since the amount of Vitamin C ingested will be distributed to other body tissues as well, topical Vitamin C provides more local results in treatment of specific skin problems. Also, since Vitamin C is water soluble, any excess in dietary Vitamin C intake will just be excreted out along with urine, so by ingesting more than needed will not lead to more Vitamin C in the skin or body.

[Explore Skin Need collections that contain Vitamin C]