C-tetra intense incorporates all the benefits of medik8’s best-selling c-tetra serum, with additional brightening and nourishing ingredients, including maracuja oil, vitamin f and red ginseng. this hydrating anti-ageing serum stimulates the production of collagen and elastin, to diminish the appearance of fine lines and wrinkles. powerful antioxidant protection combats sun- and pollution-induced damage. c-tetra’s water-free formula is 100% stable, ensuring the vitamin c within does not degrade over time.