Medik8 C-Tetra

Medik8 Authentic
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Medik8 C-Tetra by Medik8

free shipping on all australian orders.

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.

The Medik8 C-Tetra has been 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).

This product cannot be shipped outside of Australia 


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


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, neck and decollete. 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 SPF25 or your preferred SPF hydrator/sunscreen.

Shipping & Returns

FREE EXPRESS shipping on orders over $50


FREE standard shipping within Australia!

Same day Melbourne delivery to select post codes.


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Reviews (10)
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Good enough to eat - 08-05-2018 by

Smells amazing, I’ve had great results with it. Initially my skin broke out, but that was because I had gone from never ever using products to suddenly having a routine.

Would recommend following with the medik8 c tetra day cream and then sunscreen.

Love this product - 29-04-2018 by

It has a good smell and absorb really quick. This vitamin c brightening my skin

Lovely Vit C Serum - 20-02-2018 by

Ive seen good results with this serum. It definitely brightens my skin and plumps it up. Strangely, I actually noticed this when I stopped using it for a few days - my skin looked duller. Once I started to use this serum again my skin just looked better.
It absorbs into the skin nicely & has a slight citrus scent to it. It will too will have your skin looking brighter and more radiant.

The best vitamin c on the market - 19-02-2018 by

So convenient in a liquid dropper bottle, it's easier to apply or mix.
It also smells amazing! I love it.

Awesome product! - 27-09-2014 by

The serum is easily absorbed, gives a youthful glow & brightness to the skin. I feel like it has been quite healing also

Amazing product - 31-08-2014 by

The Vitamin C serum is the most beautiful, nourishing serum I've found. It's healing properties are really quite remarkable and it smells good enough to eat! With sensitive, combination skin I found this serum did not encourage more oil, merely adapted to my skin type and I couldn't be happier with my purchase! Thank you, Adore Beauty and Medik8! Xxx

Will repurchase over and over! - 20-02-2014 by

Not only does a little bit go a long way, but I am seeing results after only 3 weeks of using this! I've been putting it on in the mornings after I use my SK-II Facial Treatment Essence and my gods, my skin already seems to be more even in tone and smoother!

I find three drops covers my whole face and neck (I like to use a little bit more to cover whatever parts of my decollete are showing).

For a vitamin C serum this is really not drying or uncomfortable - actually if anything my skin feels more hydrated once I've used it, and certainly a lot smoother. Plus, it smells really nice - like a very natural citrus scent. Lovely!

Evens skin tone - 14-09-2013 by

I love this serum I use it in the morning after cleansing and it it so moisturising and hydrating
I have found this has definitely evened out my skin tone. Another bonus it smells amazing!

Beautiful product!! - 20-06-2013 by

Although this serum seems expensive, it does go a long way and feels amazing on your skin. I only need 4 small drops and that covers my whole face & neck. I use it once a day (in the morning) and love it!

Good product from an excellent company - 20-05-2013 by

I really like the lack of packaging from Medik8. I was pleased with the information about each product on their website, as well as their stance on all things 'chemical' and environmental. I find that the serum is absorbed into my skin very quickly and I have only a short period to blend it over the rest of my face - not sure what that says about my face, but there does seem to be a specific method of application that works (direct onto skin and then blend quickly). I do think the texture of my skin has improved though I can't see anything significant for brightness.

Q & A
1 Question Ask a question
  • From Medik8 C-Tetra at 10/02/179:02 PM
    • Q: Can this be used to treat broken capillaries?
    • A: Hi Ruth,

      Thanks for your product question. The Medik8 Vitamin C is a wonderful, really stable formulation, and can help to reduce visible redness on the skin's surface and to strengthen your capillaries. It will not make your dilated capillaries disappear, but it will improve the appearance and help to prevent more from forming.

      I hope this helps. If you have any questions, please don't hesitate to contact our customer service team at, or by phoning us on (03) 9486 7179.

      Kind Regards,

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