Medik8C-Tetra Advanced
Unlock next-generation brightening and antioxidant defence with C-Tetra® Advanced, powered by 20% stabilised vitamin C and skin barrier science. Clinically proven to brighten skin and visibly reduce wrinkles in just 7 days* with 0% barrier disruption,* this high-strength serum delivers transformative results without compromising skin health.
Featuring restorative phyto exosomes for deep, controlled delivery and omni-antioxidant acetyl zingerone to neutralise ageing free radicals, C-Tetra® Advanced provides targeted, age-defying protection and a visibly smoother, more radiant complexion.
*Proven via independent clinical study conducted over 4 weeks on 32 participants.
KEY BENEFITS
Dramatic Skin Brightening
Clinically proven to visibly brighten and even skin tone in just 7 days, revealing a radiant, luminous complexion.*
Enhanced Skin Barrier Support
Phyto exosomes deliver key signalling molecules, including peptides and nutrients, to support the skin barrier with 0% barrier disruption.*
Defence Against Premature Ageing
Shields skin from free radicals, pollution, and daily environmental stressors to help prevent premature skin ageing.
Smoother, More Even Texture
Clinically proven to improve skin smoothness and texture in 7 days, leaving a soft, polished finish.*
Lightweight, Fast-Absorbing Feel
The gel-serum texture hydrates, smooths, and primes skin, leaving it instantly refreshed and ready for the day.
20% Stabilised Vitamin C (Tetrahexyldecyl Ascorbate)
A highly potent yet gentle form of vitamin C for dramatic skin brightening and powerful antioxidant protection against premature skin ageing.
Phyto Exosomes
Encapsulated by nature, our phyto exosomes intelligently deliver proteins, lipids, and messenger molecules to skin cells. Together, alongside our supercharged vitamin C, they help prevent & reduce premature skin ageing by supporting healthier-looking, more resilient skin.
Acetyl Zingerone (pronounced ‘a-sea-tul')
A super-antioxidant that works synergistically with vitamin C, enhancing its efficacy while neutralising ageing free radicals and shielding skin from environmental stressors.
Multi-Weight Hyaluronic Acid
Draws moisture into the skin to instantly plump and deeply hydrate for a soft, supple complexion.
KEY INGREDIENTS
20% Stabilised Vitamin C (Tetrahexyldecyl Ascorbate)
A highly potent yet gentle form of vitamin C for dramatic skin brightening and powerful antioxidant protection against premature skin ageing.
Phyto Exosomes
Encapsulated by nature, our phyto exosomes intelligently deliver proteins, lipids, and messenger molecules to skin cells. Together, alongside our supercharged vitamin C, they help prevent & reduce premature skin ageing by supporting healthier-looking, more resilient skin.
Acetyl Zingerone (pronounced ‘a-sea-tul')
A super-antioxidant that works synergistically with vitamin C, enhancing its efficacy while neutralising ageing free radicals and shielding skin from environmental stressors.
Multi-Weight Hyaluronic Acid
Draws moisture into the skin to instantly plump and deeply hydrate for a soft, supple complexion.
N-Acetyl Glucosamine (NAG)
A barrier-supporting, gentle, skin-refiner that smooths the look of pores, while helping to increase the skin's own natural hyaluronic acid levels over time.
7 days to visibly reduced wrinkles<1>
0% barrier disruption<1>
7 days to visibly smoother skin texture<1>
Reduces 90% of pollution damage to the skin's surface<2>
<1> Proven via independent clinical study conducted over 4 weeks on 32 participants.
<2> Proven via in vitro protein carbonylation data against particulate matter pollution on the stratum corneum and epidermis.
Featuring restorative phyto exosomes for deep, controlled delivery and omni-antioxidant acetyl zingerone to neutralise ageing free radicals, C-Tetra® Advanced provides targeted, age-defying protection and a visibly smoother, more radiant complexion.
*Proven via independent clinical study conducted over 4 weeks on 32 participants.
KEY BENEFITS
Dramatic Skin Brightening
Clinically proven to visibly brighten and even skin tone in just 7 days, revealing a radiant, luminous complexion.*
Enhanced Skin Barrier Support
Phyto exosomes deliver key signalling molecules, including peptides and nutrients, to support the skin barrier with 0% barrier disruption.*
Defence Against Premature Ageing
Shields skin from free radicals, pollution, and daily environmental stressors to help prevent premature skin ageing.
Smoother, More Even Texture
Clinically proven to improve skin smoothness and texture in 7 days, leaving a soft, polished finish.*
Lightweight, Fast-Absorbing Feel
The gel-serum texture hydrates, smooths, and primes skin, leaving it instantly refreshed and ready for the day.
20% Stabilised Vitamin C (Tetrahexyldecyl Ascorbate)
A highly potent yet gentle form of vitamin C for dramatic skin brightening and powerful antioxidant protection against premature skin ageing.
Phyto Exosomes
Encapsulated by nature, our phyto exosomes intelligently deliver proteins, lipids, and messenger molecules to skin cells. Together, alongside our supercharged vitamin C, they help prevent & reduce premature skin ageing by supporting healthier-looking, more resilient skin.
Acetyl Zingerone (pronounced ‘a-sea-tul')
A super-antioxidant that works synergistically with vitamin C, enhancing its efficacy while neutralising ageing free radicals and shielding skin from environmental stressors.
Multi-Weight Hyaluronic Acid
Draws moisture into the skin to instantly plump and deeply hydrate for a soft, supple complexion.
KEY INGREDIENTS
20% Stabilised Vitamin C (Tetrahexyldecyl Ascorbate)
A highly potent yet gentle form of vitamin C for dramatic skin brightening and powerful antioxidant protection against premature skin ageing.
Phyto Exosomes
Encapsulated by nature, our phyto exosomes intelligently deliver proteins, lipids, and messenger molecules to skin cells. Together, alongside our supercharged vitamin C, they help prevent & reduce premature skin ageing by supporting healthier-looking, more resilient skin.
Acetyl Zingerone (pronounced ‘a-sea-tul')
A super-antioxidant that works synergistically with vitamin C, enhancing its efficacy while neutralising ageing free radicals and shielding skin from environmental stressors.
Multi-Weight Hyaluronic Acid
Draws moisture into the skin to instantly plump and deeply hydrate for a soft, supple complexion.
N-Acetyl Glucosamine (NAG)
A barrier-supporting, gentle, skin-refiner that smooths the look of pores, while helping to increase the skin's own natural hyaluronic acid levels over time.
Directions
After cleansing in the morning, apply evenly across the face, neck & décolletage using upward strokes.
Test results
7 days to visibly brighter skin<1>7 days to visibly reduced wrinkles<1>
0% barrier disruption<1>
7 days to visibly smoother skin texture<1>
Reduces 90% of pollution damage to the skin's surface<2>
<1> Proven via independent clinical study conducted over 4 weeks on 32 participants.
<2> Proven via in vitro protein carbonylation data against particulate matter pollution on the stratum corneum and epidermis.
Ingredients
Aqua (Water), Tetrahexyldecyl Ascorbate, Isododecane, Propanediol, Acetyl Glucosamine, Squalane, Tocopherol, Acetyl Zingerone, Camellia Sinensis (Green Tea) Leaf Vesicles, Hydroxyacetophenone, Sodium Hyaluronate, Cellulose, Avena Sativa (Oat) Kernel Extract, Glycerin, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Citrus Grandis (Grapefruit) Peel Oil, Sucrose Stearate, Tetrasodium Glutamate Diacetate, Ethylhexylglycerin, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Sodium Benzoate, Cellulose Gum, 1,2-Hexanediol, Polysorbate 60, Sorbitan Isostearate, Citric Acid, Phenoxyethanol, Citral, Linalool, Limonene.
This list of ingredients may be subject to change, please consult the packaging of the product purchased.
+Offer
FREE Press & Clear 150ml when you spend £100 on Medik8.*
Reveal visibly clearer skin in just 7 days - without irritation* with Medik8’s Press & Clear.
*One free gift per order. Valid until the 10th of May or whilst stock lasts. Your free gift will automatically add to the shopping bag page. Total at order summary must be £100 or more worth of Medik8 products, after any Promotion Code, Brands You Love discount and before delivery charges are applied. Cannot be used in conjunction with any other Promotion and this offer is not applicable to previously made or pending purchases
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Rated 5 out of
5
by
Muni from
The best Vit-C
[This review was collected as part of a promotion.] This is my second bottle, and I absolutely love it. It has really helped transform my hyperpigmentation, and it's very lightweight, easy to layer
Date published: 2026-05-01
Rated 5 out of
5
by
Christine P. from
Great Product
[This review was collected as part of a promotion.] Great product. I can definitely see and feel the difference in the texture of my skin. The uneven pigmentation has definitely improved. Skin looks so much brighter. It has a great smell too.
Date published: 2026-04-29
Rated 5 out of
5
by
Angela K. from
Lovely product. Have just ordered
[This review was collected as part of a promotion.] Lovely product.
Have just ordered my second bottle.
Date published: 2026-04-28
Rated 5 out of
5
by
jaclyn s. from
Insanely good
[This review was collected as part of a promotion.] There literally aren’t better products than Medik8.
And this one is obscenely good.
The brightness and coverage - it’s last ages and really is user friendly.
I also have the small sample on for my travel bag as I can’t live without it now.
Their whole vitamin C range is amazing but I love the texture of this. And the glow from my face speaks volumes
Date published: 2026-04-26
Rated 4 out of
5
by
James H. from
Satisfying to use vitamin C serum
[This review was collected as part of a promotion.] I see my skin visibly brighter from first applying the serum soaks in very quickly and feels moisturised. I prefer the texture of this serum to the oil based vitamin C I find the advanced is absorbed by my skin better and my skin looks a lot brighter compared to the oil.
Date published: 2026-04-26
Rated 5 out of
5
by
Leah B. from
IN LOVE
[This review was collected as part of a promotion.] I always used the Medik8 retinals and figured I should branch out and try the Vit C range and I am so glad I did! Results are fantastic leaving my skin glowing no longer dull and my hyperpigmentation is definitely fading! I recommend this product 1000%
Date published: 2026-04-24
Rated 5 out of
5
by
Zuzanna from
Best vit-c serum I've ever used!
Great product! Perfect texture, good quality Vit-c. Absorbs very well and leaves skin fresh and protected from all the environmental challenges out there. Work well under the make up. After a year of using, I would never go back to cheaper products. I love that Madik8 displays all the ingredients and the consantration and type of Vit-c used, which is paramount in deciding wether the product is worth it's price!
Date published: 2026-04-21
Rated 5 out of
5
by
LINDSAY from
Love Love Love
light weight and best Vitamin C i used medik8 and this is outstanding, some vitamin C smell awful but this is sweet and doesn't have a strong fragrance, i keep repurchasing
Date published: 2026-04-18
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