The original, bestselling C-Tetra serum. A gentle yet effective lightweight vitamin C serum for restoring the appearance of skin radiance and minimising the visible signs of ageing.

C-Tetra contains tetrahexyldecyl ascorbate, a super-stable form of vitamin C that boosts the antioxidant defence levels in the skin. Ever the multi-tasker, it also stimulates collagen production to reduce the appearance of fine lines and wrinkles, leaving the complexion plump, radiant and youthful looking. As a lipid-soluble form of vitamin C, it is able to penetrate the skin’s defensive lipid barrier with ease; delivering benefits deep within the skin. Vitamin C and vitamin E work together synergistically as 'network antioxidants', boosting the serum’s overall antioxidant effect to keep skin protected throughout the day.

The serum’s brightening power is supercharged by maracuja oil, which is naturally awash with vitamin E and nourishing fatty acids. Alongside this, the intense version of our cult serum is packed full of nourishing vitamin F and squalane which help to reinforce the skin’s natural protective barrier against free radicals. Meanwhile, optimised red ginseng boosts the serum’s brightening powers for a luminous, even complexion.