Medik 8 CE-Tetra is a revolutionary ultra-stable Vitamin C booster for daily use which helps combat sun-induced damage to the skin, trigger collagen synthesis, increase the skin’s elasticity & density as well as improve the skin’s texture & brighten the complexion. Designed for both men & women in their mid-20s to 40s. Regular vitamin C is very unstable & many typical vitamin C products are inactive by the time they are used on the skin, in some cases, they have become pro-oxidant & actually generate free radicals! Ground-breaking stability data on CE-Tetra guarantees real vitamin C activity & best of all, unlike L-ascorbic acid (regular vitamin C), C-Tetra will not exfoliate or irritate skin. CE-Tetra contains 7% Tetrahexyldecyl Ascorbate, the most potent & highly stable derivative of vitamin C available. CE-Tetra has been shown to have upto 4 times the potency L-ascorbic acid & other derivatives such as MAP (magnesium ascorbyl phosphate). in addition, CE-Tetra contains PP-2 (Polyolprepolymer-2) for enhanced penetration. Paraben & fragrance free. Unfortunately due to shipping restrictions, we are unable to send this product to customers outside of the EEA.