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Medik8 C-Tetra® 30ml

Medik8 C-Tetra® 30ml

%0 4.73 | 768 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.

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Rated 5 out of 5 by from Lovely product, feels really nice Lovely product, feels really nice when applied to the skin and definitely makes my skin look brighter and my complexion look more even. I wouldn’t use another product goods forward
Date published: 2025-05-15
Rated 5 out of 5 by from The best serum I'm in. love with the vit C serum. It leaves my skin so soft and i can see the change which is better than before.
Date published: 2025-05-14
Rated 5 out of 5 by from Really good! Feels lovely on the skin and I've noticed a difference in my skin, it looks less dull!
Date published: 2025-05-13
Rated 3 out of 5 by from Hoping it needs longer………. I’m hoping this product just needs a little longer to get to work and show a noticeable difference. If I had to say if it had made a difference I would say very very slightly. I think the area around the brown patch has changed probably mor3 but the 2 brown patches on my face are still very present but hopefully fading, it’s only been 2-3 weeks so still hoping it will work……………………
Date published: 2025-05-12
Rated 5 out of 5 by from Clearer, softer skin Absolutely love this product. My skin is a lot clearer, softer and feels more moisturised. Would highly recommend.
Date published: 2025-05-11
Rated 5 out of 5 by from C tetra I use this every morning and it makes me look glowy. Love it!
Date published: 2025-05-11
Rated 5 out of 5 by from Glowy and smooth Easy to measure out with the pipette, goes on face easily and does not feel sticky or oily at all. Sinks in fast. Skin looks glowy
Date published: 2025-05-09
Rated 5 out of 5 by from Love this! I’ve used this for a few years as part of my morning skincare routine. It’s an oil-based serum, but the texture is not greasy at all. It gets absorbed into my skin so well, only leaving it with a smooth and soft complexion, ready for makeup. I can’t live without this!
Date published: 2025-05-07
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Can I use this serum under eyes?

Asked by: Ganna
Yes absolutely! 
Answered by: Tracy
Date published: 2022-10-04

What % vitamin c?

Asked by: Momina
The tetrahexyldecyl ascorbate (Vitamin C) in C-Tetra serum is 7%.
Answered by: Zowie
Date published: 2023-03-11

What percentage of vitamin c does this contain?

Asked by: Amanda
30%
Answered by: Malwina
Date published: 2023-02-28
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