Medik8C-Tetra Advanced
Product Description
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.
More information
*Product packaging may vary by region\n\nIngredients
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.
See more...
Rated 5 out of
5
by
Mrs G. from
AM Serum
[This review was collected as part of a promotion.] Lovely serum - sinks into skin & easy to layer with no piling - I have sensitive reactive skin and this feels soothing & nourishing before morning moisturiser
Date published: 2026-09-02
Rated 5 out of
5
by
Anonymous from
Can’t do without
[This review was collected as part of a promotion.] Gentle, leaves a glow and smooth skin.
Great for pigmentation and can’t do without.
Date published: 2026-09-02
Rated 4 out of
5
by
Anonymous from
Medik 8 C Tetra advanced
[This review was collected as part of a promotion.] Lovely consistency and smell. Too early to say if it's reducing age spots or wrinkles. But satisfied so far.
Date published: 2026-09-01
Rated 5 out of
5
by
Sarah A. from
Skin Brightener
[This review was collected as part of a promotion.] Postpartum my skin was looking dull and tired. I could see a difference after using C-Tetra in just a few weeks. My no. 1 Medik8 product.
Date published: 2026-09-01
Rated 5 out of
5
by
Jenny Y. from
Sunshine in a bottle
[This review was collected as part of a promotion.] Repeat buy. I love the silky smoothe texture and how it gives your skin an instant glow I prefer it ti the oil based vitamin c products.
Date published: 2026-08-31
Rated 5 out of
5
by
Alison R. from
Improved skin
[This review was collected as part of a promotion.] Seen an improvement in my skin whilst using this product and layers well with the rest of my regime
Date published: 2026-08-31
Rated 5 out of
5
by
Georgia L. from
I purchased this after seeing
[This review was collected as part of a promotion.] I purchased this after seeing other reviews and it did not disappoint. I use it in the morning alongside crystal retinal in the evening. I find these 2 work amazingly together. The C Tetra has completely changed my skin texture, my skin tone is way less uneven than it was before and dark marks from acne scars have significantly improved.
Date published: 2026-08-31
Rated 5 out of
5
by
Christine D. from
C-Tetra
[This review was collected as part of a promotion.] I love this product! Amazing results. I’d be lost without it
Date published: 2026-08-30
Help & Information
About
More From Sephora
Country Settings
United Kingdom- 4.2★★★★★
Download the Sephora App
