Medik8 C-Tetra

Ultra-stable vitamin C serum

  • Helps combat sun-induced damage to the skin
  • Increases the skin’s elasticity and density
  • Improves the skin’s texture and brightens your complexion

Size: 30ml | 1.0 Fl OzFree USA Shipping


In stock

Medik8 C-Tetra® is a revolutionary ultra-stable vitamin C serum which helps combat sun-induced damage to the skin, trigger collagen synthesis, increase the skin’s elasticity and density as well as improve the skin’s texture and brighten the complexion. Designed for both men and women in their mid-20s to 40s.

Regular vitamin C is very unstable and many typical vitamin C products are inactive by the time they are used on the skin, in some cases, they have become pro-oxidant and actually generate free radicals! Ground-breaking stability data on C-Tetra guarantees real vitamin C activity and best of all, unlike L-ascorbic acid (regular vitamin C), C-Tetra will not exfoliate or irritate skin.

C-Tetra® contains 3% Tetrahexyldecyl Ascorbate, the most potent and highly stable derivative of vitamin C available.
C-Tetra has been shown to have up to 4 times the potency L-ascorbic acid and other derivatives such as MAP (magnesium ascorbyl phosphate).

Medik8 C-Tetra Explained

C-Tetra Benefits

  • Protects skin against oxidative stress the main cause of photo-ageing
  • Complements sunscreen creams. Once applied, C-Tetra® absorbs immediately and cannot be washed off
  • Adds a luminous glow to the skin, evens out skin tone and leaves it supple, bright and well hydrated
  • Protects against free-radicals, the high energy particles which damage collagen, the skin’s natural scaffolding
  • Can contribute to the stimulation of collagen and elastin synthesis, causing the skin to appear tighter and erasing minor lines and wrinkles
  • Alleviates skin inflammation and UV-induced erythema (sunburn)
  • Actively fights against hyperpigmentation and post-acne blemishes
  • Increases physical resistance to capillary damage and thereby has a benefit to redness-prone skin
  • Improves the lipid barrier of the skin and stimulates the production of ceramides
  • Formula is non-acne aggravating and non-comedogenic (does not clog the pores)

The Medik8 C-Tetra Technology

Tetrasubstituted Lipophilic Ascorbates are the holy grail of vitamin C derivatives and tetrahexyldecyl ascorbate (C-Tetra) is the leader in the class. Medik8 offer tetrahexyldecyl ascorbate in a very simple vehicle to ensure the absence of interference from other ingredients that would be present in a regular emulsion cream or gel. Contrary to the misguided assumptions of even some expert skincare formulators, adding more antioxidant types or just loading concentration of one antioxidant in a formula can actually reduce the antioxidant effect of the product. Medik8 antioxidants have been tested throughout development and Medik8 have patents pending on innovations following this pioneering antioxidant research.

C-Tetra activity has been strengthened by the addition of a natural form of vitamin E (d-alpha isomer). Natural vitamin E and vitamin C work together synergistically in order to stabilize and ‘recharge’ each other. They prevent each from oxidizing when they are co-applied to the skin.

How to Apply C-Tetra

C-Tetra has been formulated for direct application to the face.

In the morning, after cleansing, apply 3-4 drops directly to the skin and blend evenly across the whole facial area, including eyes, neck and décolleté. Alternatively, place a drop on your finger and massage into the skin. Leave to absorb for 2-3 minutes.

Follow with the application of Hydr8 Day or your preferred hydrator.

C-Tetra Key Ingredients

  • Vitamin C (Tetrahexyldecyl Ascorbate) – lipid-stable vitamin C.
  • Vitamin E (d-Alpha Tocopherol) – antioxidant, helps to protect the skin from free radical damage and act as a network antioxidant with vitamin C.

Medik8 C-Tetra Ingredients

Simmondsia Chinensis Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Tocopherol (d-Alpha)

Official Medik8 USA Online Supplier

Leading results for Skin Ageing, Hyperpigmentation, Blemishes, Dryness & Redness

We are proud to introduce Medik8 – a British based Skin Research Company pioneering the latest cosmeceutical technologies. These breakthrough products yield incredible results — even for the most sensitive skin. Apart from being kinder to the skin, this new technology is also kinder to the planet. This “Green Cosmeceutical Brand” has discovered how to make ingredients less aggressive without reducing potency – all the gain without the pain.

Medik8® – Complete skincare range – Members Get 10% OFF at Every Checkout  JOIN NOW


There are no reviews yet.

Be the first to review “Medik8 C-Tetra”

Get 10% Off every purchase by instantly becoming a member

Join Now for Free