Sunscreen does two important jobs. It is largely used for its UVB protection benefits – blocking the rays that cause sunburn and are a major contributor to the development of skin cancer. But it also blocks UVA radiation, filtering out the rays that lead to signs of ageing.
Vitamin C does neither of these things, says Rosalind Simpson, a professor of dermatology at the University of Nottingham. That said, it is thought to help prevent sun damage in a different way.
