Your skin contains natural antioxidants that work to defend against free radicals from the environment. When these free radicals from the environment outweigh the antioxidants of your skin, the skin can no longer protect itself.

Free radicals attach to the defenseless skin cells and cause irreparable damage, ultimately leading to premature skin aging.

C-Tetra works to protect the skin from free radical damage, with Vitamin C to boost the skin's natural antioxidant defence levels.

Vitamin C is an important pillar of our CSA philosophy, as it is one of the most powerful vitamins to prevent the signs of premature skin aging.

Vitamin C also helps boost collagen production and can disrupt the overproduction of melanin to lighten dark spots and uneven skin tone.

The result? Visibly radiant, healthier, more youthful-looking skin. C-Tetra contains tetrahexyldecyl ascorbate, a form of vitamin C that is a stabilized modification of ascorbic acid (the purest form of vitamin C) that is gentle on skin and proven to deliver visible results.

Vitamin C and Vitamin E work synergistically as 'network antioxidants', enhancing the overall antioxidant effect of the serum to keep skin protected all day long.

C-Tetra is based on jojoba seed oil, for lightweight nourishment and a radiant appearance. The natural emollient oil glides effortlessly into the skin barrier, delivering the benefits of vitamin C with ease.

When combined, Vitamin C and sunscreen provide skin with ultimate protection from the sun and the environment all day long, helping to minimize signs of premature skin aging.

Buy our recommended SPF day cream Advanced Day Total Protect.

• Daily GlowThe silky serum with jojoba oil makes the skin shine effortlessly and provides a visible, healthy glow.
• Antioxidant powerVitamins C and E provide daily protection against harmful free radicals generated by sun exposure, which can cause premature skin aging.
• Soft yet effectiveTetrahexyldecyl ascorbate is a stabilized, gentle form of vitamin C, making it perfect for those new to vitamin C or for sensitive skin types who don't want to compromise on results.
• Looking for more power?Check out C-Tetra Luxe, with double the concentration of Vitamin C than C-Tetra and additional brightening and nourishing ingredients for super-charged results.

Increased strength.

Free from synthetic colours, Free from artificial fragrances, Paraben free, Phosphate free, Palm oil free, Alcohol free, Cruelty free, Vegan.

Massage 4 drops into face, neck and décolleté in the morning after cleansing.

Allow to absorb before applying sunscreen. We recommend Advanced Day Total Protect.

Key Ingredients:

• Tetrahexyldecyl Ascorbate:A fat-soluble form of Vitamin C that provides exceptional antioxidant protection against damaging free radicals while boosting collagen production for youthful-looking skin.
• Vitamin E:A fat-soluble antioxidant naturally present in the skin, Vitamin E protects the skin from free radicals and is regenerated by Vitamin C for optimum strength.