Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra
Medik8 C-Tetra


Medik8 C-Tetra

Sale price$68.80 Regular price$86.00
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Enhance skin radiance and fight ageing with C-Tetra, a lightweight daily serum containing 7% Vitamin C (Tetrahexyldecyl Ascorbate). Perfect for those new to Vitamin C, its antioxidant properties from Vitamins C and E reverse visible signs of ageing.

Enhance skin radiance and combat signs of aging with C-Tetra, a lightweight vitamin C serum. Vitamin C and E work together to provide antioxidant benefits, protecting against sun and pollution damage. This uplifting formula fights fine lines and wrinkles, brightens the complexion, and evens out skin tone. By using a lipid-soluble form of vitamin C, known as tetrahexyldecyl ascorbate, it delivers potent antioxidant protection without causing irritation. C-Tetra's water-free formula is carefully crafted for 100% stability, ensuring long-lasting effectiveness. Keep your formula potent from the first use to the last with this vitamin C serum. Its nourishing oils and anti-aging properties make it perfect for rejuvenating skin. Great for those new to vitamin C or wanting to upgrade from C-Tetra Cream or Daily Radiance Vitamin C.

Medik8 C-Tetra is suitable for all skin types, although the emollient base is most likely to be enjoyed by those with dry to dry combination skin types. Anyone concerned with premature ageing, or environmental ageing will see the benefits of Medik8 C-Tetra Lipid Vitamin C Antioxidant Serum.

Medik8 C-Tetra is suitable for use during pregnancy or when breastfeeding.


Your skin is packed full of natural antioxidants that defend against free radicals from the environment. When these environmental free radicals outweigh your skin’s antioxidants, the skin can no longer protect itself. Free radicals latch onto the defenceless skin cells, causing irreparable damage, which ultimately leads to premature 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 helps 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. 

Medik8 C-Tetra benefits:

  • Brightens and restores radiance
  • Fights and repairs free radical damage
  • Hydrates and smoothes skin
  • Promotes collagen and elastin production
  • Leaves skin soft, plump and radiant
  • Vegan and cruelty-free


Key Ingredients 

Tetrahexyldecyl Ascorbate a lipid-soluble form of vitamin C that provides exceptional antioxidant protection from harmful free radicals, while helping prevent the appearance of ageing for a youthful complexion.
 Vitamin E a lipid-soluble antioxidant that is naturally present in the skin. Vitamin E protects the skin from free radicals and is regenerated by vitamin C for optimum power.

Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.

We believe in the right product for the right person. We want our product information to be useful to you, so we have done our best to provide you with the most up to date ingredients list.

Please note that from time to time, products are innovated without notice. For the most accurate information please consult the product box. 

If you spot an error, please let us know! We will update this ingredients list as soon as possible.


After cleansing in the morning, massage 4 drops across the face, neck and décolletage. Leave to absorb before applying moisturiser.

If this product is sealed, please ensure the seal is intact prior to using the product.


All Orders Same Day Dispatch by 2pm M-F (Sydney Business Days) any orders placed after 2pm will leave the following (Sydney Business Day). Please note during big sale periods this can be delayed by a day or two.

FREE for orders $49+ via Australia Post e-Parcel road. Express Post Air add $6.95 via Australia Post

Any orders under $49 will have two options for shipping $4.95 e-Parcel post standard shipping by road via Australia post or $9.95 Express Post express shipping by air via Australia post.

If it's not right and you haven't opened it yet, you are welcome to Return It within 30 days. Reach out to our team for authorisation prior to returning to us in original sealed condition.

Already opened or used the product? We can only accept returns if product is faulty, not if you dislike the product! please reach out to us first and we can discuss your options as each brand is different. We can help you understand if a return is possible.

We unfortunately cannot accept returns without return authorisation prior to sending to us.

Customer Reviews

Based on 4 reviews
So glowy!

Have never used Vit C before, but wow I’m so glad I introduced this to my routine! The Medik8 C-Tetra has a lovely faint scent and noticeably brightens my face in the morning. Will definitely be a regular addition to my routine. Also was very happy with how CSH packaged my order, the little treat was a nice touch and the info card on morning / evening product order was actually so helpful for me!

Awesome item

This has done wonders for my skin. Great potent product

Marianne Jones
It works

I’ve always have a problem finding a good, reliable vit C. And having tried the c-tetra made me a lifetime user. My skin’s always bright even with little sleep. Thanks for a product that works.

Holly Farthing

Medik8 C-Tetra Lipid Vitamin C Serum 30ml