Ester C is patented form of Vitamin C that is more bio-available and more concentrated than other forms of Vitamin C. It protects cells from the damage caused by free radicals by providing anti-oxidant protection. Ester C is highly recommended by Nicholas Perricone in The Wrinkle Cure for the treatment of wrinkles, weather damaged skin, and general healing of tissue. Apply once daily to the face and around the eyes.