Antioxidant Serum AM and Perfection C Gel products contain Tetrahexyldecyl ascorbate, clinically demonstrated to improve skin appearance. The gentle, acid-free vehicle is ideal for sensitive skin.  These products contain natural-source Vitamin E Acetate (d-stereoisomer) for enhanced lipid-based antioxidant activity. Green Tea is a mixture of xanthine compounds (e.g. caffeine) and antioxidant polyphenols. These non-acid formulas are useful for individuals with sensitive skin, eye area application and after in-office procedures where the skin barrier may be compromised, such as microdermabrasion, chemical peels, and light treatments.