Medik8 C-Tetra is a revolutionary, stable vitamin C serum to help combat sun-induced damage to the skin and maintain collagen production, increase the skin's elasticity and density, as well as improve the skins texture and brighten the complexion. This formula also contains vitamin E, which synergistically boosts the antioxidant effect. The level of vitamin C in C-Tetra is well tolerated by those sensitive to vitamin C irritation and is ideal for people in their 20's and 30's. Protects the skin from free radicals, helps maintain levels of collagen and elastin, helps to diminish pigmentation marks and minimises signs of premature skin ageing. Directions: After cleansing in the morning, apply 4 drops directly onto the skin and blend evenly across whole facial area, neck and décolletage. Alternatively, place a drop on your finger and massage into the skin. Leave to absorb before applying your regular Medik8 hydrator.