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Medik8 C-Tetra® 30ml

Medik8 C-Tetra® 30ml

%0 4.73 | 756 reviews
Box

£39.00 (£1.30 per ML)

In stock

If you like we can let you know when we have some more.

Restore the appearance of skin radiance in just 7 days* with Medik8’s cult favourite C-Tetra serum.

Expertly formulated by their skincare experts with a stabilised form of vitamin C (tetrahexyldecyl ascorbate ), this lightweight serum reduces the appearance of fine lines and wrinkles and visibly brightens uneven skin tone - all while remaining gentle on sensitive skin.

The addition of antioxidant-rich vitamin E protects the skin against the damaging and ageing effects of free radicals for a more healthy, youthful-looking complexion overall. The perfect daily serum for those who are new to vitamin C, or have sensitive skin.
*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin.

Key Benefits:
Increased Skin Youthfulness
Proven to smooth the appearance of fine lines and wrinkles and visibly boost skin's radiance in 7 days*
*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin.

Brighter, More Even Complexion
Proven to visibly brighten the skin in 7 days* and reduce the appearance of wrinkles & dark spots in 4 weeks*
*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin.

Gentle, Lightweight Nourishment
The jojoba seed oil-based formula delivers non-greasy yet effective nourishment for visibly comforted and softer skin.
87% of sensitive skins agree this is the most gentle vitamin C serum they have ever used*
96% of sensitive skins agreed C-Tetra was gentle on the skin*
*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin.

Proven Results:
7 days to restored skin radiance*
7 days to visibly brighter
96% of sensitive skins agreed C-Tetra was gentle on the skin*
4 weeks to visibly reduced wrinkles & dark spots*
90% agree skin feels instantly softer*
*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin.

Key Ingredients:
Stabilised Vitamin C (tetrahexyldecyl ascorbate)
This stable, low-irritation form of vitamin C is incredibly effective on the skin; delivering exceptional protection against ageing free radicals. Supporting collagen production and brightening the skin tone, it leaves the complexion visibly more even, radiant and youthful-looking.

Vitamin E
Rich in antioxidants, vitamin E helps to protect the skin against ageing free radicals. It also helps to boost the power of vitamin C for maximum visible results.

Good to Know:
NO ARTIFICIAL FRAGRANCE
NO SYNTHETIC COLOURS
PARABEN FREE
CERTIFIED BY THE VEGAN SOCIETY

Directions

STEP 1
After cleansing in the morning, massage 4 drops across the face, neck and décolletage.

STEP 2
Leave to absorb before applying sunscreen. We recommend Advanced Day Ultimate Protect.

How to Layer C-Tetra
AM: Apply C-Tetra after cleansing and toning in your morning skincare routine. Always follow with sunscreen.

Ingredients

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

+Offer

FREE Press & Glow 200ml worth £32 when you spend £90 on Medik8.*

Medik8’s innovative answer to traditionally drying and stinging acid toners, Press & Glow is clinically proven to deliver glowing skin in just 2 weeks*. 

*One free gift per order. Valid until the 26th of May or whilst stock lasts. Your free gift will automatically add to the shopping bag page. Total value at order summary must be £90 or more worth of Medik8 products, after any Promotion Code, Brands You Love discount and before delivery charges are applied. Excludes Gift Voucher and Fragrance Gift Box purchases. Cannot be used in conjunction with any other Promotion and this offer is not applicable to previously made or pending purchases. This offer is available online at Sephora.co.uk to UK Mainland customers only.

Shop this offer

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Rated 5 out of 5 by from Happy Very thin consistency. Almost slips through the fingers. Dries really quickly on face. Nice scent
Date published: 2025-05-02
Rated 5 out of 5 by from Amazing vitamin C serum! C-Tetra from Medik8 is the first product I've tried, and I absolutely love it! After struggling to find the right vitamin C serum, I finally found one that works for my combination skin. Despite being oil-based, it feels lightweight and absorbs quickly, leaving my skin smooth and radiant. I also appreciate its 12-month stability after opening, compared to the 3 to 6 months of others. I'm excited to explore more Medik8 products and highly recommend C-Tetra!
Date published: 2025-05-01
Rated 5 out of 5 by from Silky smooth serum I haven’t been using this long but so far so good. It’s expensive but a little really does go a long way. It’s a lovely silky smooth serum that makes my skin feel amazing
Date published: 2025-04-30
Rated 4 out of 5 by from what`s not to love Love vitamin C serums of Medik8, results are noticeable
Date published: 2025-04-29
Rated 4 out of 5 by from Great vitamin c product Easy to integrate, quick absorbing, not a lot needed. Already seeing improvements in skin texture and evenness
Date published: 2025-04-28
Rated 5 out of 5 by from My Skin snd Makeup Like This The oil absorbs into my skin and sits nicely under makeup. This definitely keeps my age spots under control. My daughter has swiped it!
Date published: 2025-04-25
Rated 5 out of 5 by from C-Tetra vitamin C serum Really like this. I suffer from pretty hormonal skin at the moment and I was concerned that this might cause breakouts as has been the case with other serums from other companies. But my skin is looking brighter and the number of breakouts has reduced significantly.
Date published: 2025-04-24
Rated 5 out of 5 by from C -Tetra Love this product- skin a lot brighter . Will keep purchasing
Date published: 2025-04-24
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Can I use this serum under eyes?

Asked by: Anonymous
Yes absolutely! 
Answered by: Anonymous
Date published: 2023-05-24

What % vitamin c?

Asked by: Anonymous
The tetrahexyldecyl ascorbate (Vitamin C) in C-Tetra serum is 7%.
Answered by: Anonymous
Date published: 2023-05-24

What percentage of vitamin c does this contain?

Asked by: Anonymous
30%
Answered by: Anonymous
Date published: 2023-03-04
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