Most skincare experts agree that the most effective percentage of vitamin C is between 10% to 20%. Products with a higher concentration can be irritating to the skin, and in very high doses can be ...

Every item on this page was chosen by an ELLE editor. We may earn commission on some of the items you choose to buy. Almost every skin consultation with a dermatologist or esthetician arrives at ...

In his experiment, Ishigami gave just enough vitamin C to sustain life to 20 mice incapable of producing it. 05:45 All of the normal mice survived for at least ten months.