The Peter Thomas Roth AHA / Kojic Acid Under Eye Brightener is an eye cream that helps to diminish the appearance of fine lines as well as brighten up skin discoloration that creates or worsens the appearance of dark circles. Animal Cruelty Free. Not for use on the upper eyelids. Use sparingly just once a day. May be combined into a dark circle regimen that uses Peter Thomas Roth Power K Eye Rescue, as well as another antioxidant.