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With their tried-and-tested CSA philosophy a hard-working marriage between vitamin C with sunscreen by day, and vitamin A by night Medik8 seeks to create simple routines that result in healthy, beautiful skin for life. The goal is to uncloak the mystery surrounding anti-ageing skin care with results-driven products that dont compromise on ethics. Championing sustainability, cleaner oceans and less waste, Medik8 is a brand with heart one that began with a simple love for family. After creating an anti-redness product for his sister, Medik8s founder Elliot Isaacs went on to create the powerhouse that is Medik8 today. Boasting handy all-rounders like the C-Tetra serum, you need to introduce a batch of Medik8 to your bathroom cabinet, stat! This best-selling formula helps to restore radiance and fights premature signs of ageing with vitamins C and E a results-driven combo thats proven to work against sun and pollution-induced damage for more youthful, rejuvenated and nourished skin.
Two key antioxidants vitamins C and E make the C-Tetra your new Holy Grail serum. Perfect for everyday use with its light formula, C-Tetra sinks past the defensive lipid barrier and deep into skin, for extra protection against sun and pollution-induced damage.
This formula visibly stimulates the production of collagen and elastin while also brightening and balancing skin tone as it protects your skin from premature ageing. C-Tetra uses tetrahexyldecyl ascorbate, an uber-effective source of vitamin C that not only allows for deeper penetration, but results in less irritation important for sensitive skin types. Brightness is then boosted by red ginseng and maracuja oil, which is naturally rich in vitamin E. Vitamin E perfectly complements the vitamin C, delivering a nourishing dose of hydration to give a soft, glowy complexion. As luxurious as it is efficient, C-Tetra treats you to an uplifting scent of sweet orange, sans any artificial fragrances the perfect way to begin your morning.
After cleansing in the morning, massage 4 drops across the face, neck and decolletage. Leave to absorb before applying moisturiser.
Please note: the visual and product name listed may differ to the packaging received due to product updates across the range. Rest assured, the formula and great results will remain the same.
Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.
- Medik8
- 30ml
Transparency lies at the heart of our philosophy which is why we have partnered with tech-platform – Provenance – to cut through the industry ‘noise’ and equip you with key facts that matter. A 'proof point' with a green tick means a third party has verified the accuracy of the statement whereas no green tick means that there isn't independent confirmation (yet!), but that the brand has still supplied substantiating evidence (which you can view yourself). Discover the proof points for this product below.
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Total Price: £88.00
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4 instalments of £9.75 with clearpay Learn more

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With their tried-and-tested CSA philosophy a hard-working marriage between vitamin C with sunscreen by day, and vitamin A by night Medik8 seeks to create simple routines that result in healthy, beautiful skin for life. The goal is to uncloak the mystery surrounding anti-ageing skin care with results-driven products that dont compromise on ethics. Championing sustainability, cleaner oceans and less waste, Medik8 is a brand with heart one that began with a simple love for family. After creating an anti-redness product for his sister, Medik8s founder Elliot Isaacs went on to create the powerhouse that is Medik8 today. Boasting handy all-rounders like the C-Tetra serum, you need to introduce a batch of Medik8 to your bathroom cabinet, stat! This best-selling formula helps to restore radiance and fights premature signs of ageing with vitamins C and E a results-driven combo thats proven to work against sun and pollution-induced damage for more youthful, rejuvenated and nourished skin.
Two key antioxidants vitamins C and E make the C-Tetra your new Holy Grail serum. Perfect for everyday use with its light formula, C-Tetra sinks past the defensive lipid barrier and deep into skin, for extra protection against sun and pollution-induced damage.
This formula visibly stimulates the production of collagen and elastin while also brightening and balancing skin tone as it protects your skin from premature ageing. C-Tetra uses tetrahexyldecyl ascorbate, an uber-effective source of vitamin C that not only allows for deeper penetration, but results in less irritation important for sensitive skin types. Brightness is then boosted by red ginseng and maracuja oil, which is naturally rich in vitamin E. Vitamin E perfectly complements the vitamin C, delivering a nourishing dose of hydration to give a soft, glowy complexion. As luxurious as it is efficient, C-Tetra treats you to an uplifting scent of sweet orange, sans any artificial fragrances the perfect way to begin your morning.
After cleansing in the morning, massage 4 drops across the face, neck and decolletage. Leave to absorb before applying moisturiser.
Please note: the visual and product name listed may differ to the packaging received due to product updates across the range. Rest assured, the formula and great results will remain the same.
Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.
- Medik8
- 30ml
Transparency lies at the heart of our philosophy which is why we have partnered with tech-platform – Provenance – to cut through the industry ‘noise’ and equip you with key facts that matter. A 'proof point' with a green tick means a third party has verified the accuracy of the statement whereas no green tick means that there isn't independent confirmation (yet!), but that the brand has still supplied substantiating evidence (which you can view yourself). Discover the proof points for this product below.
Frequently Bought Together



Total Price: £88.00
Add both to basket
Customer Reviews
Top Customer Reviews
Thanks for sharing your thoughts! Please remember that results will vary from person to person. We're proud to say that all customer reviews are independent, authentic and do not represent the views of Cult Beauty or The Hut Group.
Magical
Simply the best serum oil lve ever used Glides on to my skin and leaves flawless. Smells divine too. Make up sits well on after moisturiser too. Love it!!Â
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5 out of 5
I have been using this serum for years and I always haveto have spare one at home. I love the texture (even though I am not a big fan of oil) this one will leave your skin dry and radiant. Definitely recommended
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Favourite vitamin c
My favourite vitamin C for giving me a morning glow
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My go to vitamin c
I have tried quite a few but none are  as good as this one. It has nice feel to the skin with a light orange smellÂ
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Love this!
This vitamin C feels very luxurious. I decided to invest in this product after using L’Oréal for such a long time. A really nice orange scent to it and feels really nice on the skin. It’s quite runny though!
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Glowing skin
This product is now a firm favourite in my skin care routine! It leaves my complexion looking brighter and leaves a healthy glow. Found a little goes a long way with it being an oil based serum but doesn't leave you feeling greasy.
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Great vitamin c
great vitamin c that leaves skin feeling lovely
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Strong smell
It’s so good but the smell is too strong. But it does give u instant glow like over never seen before.Â
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Now a skin care staple
I originally tried this as part of the advent calendar a couple years ago and now it's a mainstay in my skin care routine. I 100% notice the different when using it - my skin is more glowy, clearer and smoother.
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Non-irritating vitamin C, although pricey
I got this Vitamin C as a part of beauty edit. I was pleasently surprised, as it doesn't irritate my dry skin (although I use it every third day). It also has a lovely, citrusy smell. It is quite pricey and I probably wouldn't buy it on its own or non-discounted.
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