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C-Tetra®

Medik8 C-Tetra® 30ml

%0 4.73 | 884 reviews
Box

£45.00 (£1.50 per ml)

In stock

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

Product Description

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.

This list of ingredients may be subject to change, please consult the packaging of the product purchased.

See more...

Rated 5 out of 5 by from Would not go without it now that I have tried it I love this serum as it really makes my skin feel fresh and hydrated in the morning. This is my second bottle and will continue using it in combination with the vitamin C cream. It works well on sensitive skin. My skin feels smoother now.
Date published: 2026-01-15
Rated 5 out of 5 by from Obsessed Obsessed with this product! Skin is so much brighter, will repurchase again and again!
Date published: 2026-01-13
Rated 5 out of 5 by from Medic8 C tetra A little ray on sunshine in the morning! Gives my skin a glow and evens out the skin tone - can’t be without now
Date published: 2026-01-09
Rated 5 out of 5 by from I have been using this I have been using this for about 3 years and I couldn't go without it
Date published: 2026-01-09
Rated 5 out of 5 by from My favorite 🤩 This vitamin C serum is absolutely perfect for sensitive and combination skin. It brightens the complexion, adds a healthy glow and helps even out skin tone without any irritation. The texture is lightweight, absorbs quickly and works beautifully under moisturiser and SPF. My skin looks fresher, smoother and more radiant. One of the best vitamin C serums I’ve tried.
Date published: 2026-01-08
Rated 5 out of 5 by from Love how easily this absorbs Love how easily this absorbs into my skin without leaving any oiliness behind.
Date published: 2026-01-04
Rated 5 out of 5 by from Best product I use! The absolute best product available! Immediately notice a difference to my skin when using it. Texture is easy to wear under makeup which means I easily use it daily. I’m a repeat customer of Medik8, but especially for this vitamin C because I love it so much! Would recommend for anyone with redness, uneven tone and generally for balancing your complexion.
Date published: 2026-01-02
Rated 5 out of 5 by from Been using this product for Been using this product for years and everyone says my skin looks good
Date published: 2026-01-02
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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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