Cosmetic Topical Use of Vitamin C

The topical use of vitamin C as a cosmetic arouses much interest within the field of medicine and cosmetic dermatology. Its different forms of presentation have evolved over the years to increase its bioavailability. Its use in cosmetics generates significant amounts of money day after day. Is there scientific evidence of its usefulness and its absorption? Is there scientific support for the marketing campaigns on the cosmetic use of Vitamin C? Does it present any contraindication or can it be used universally? What is new in the topical use of Vitamin C? Are all cosmetic presentations effective? Is it as useful as the cosmetic industry tells us?