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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 daccolletage. 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: 82.00€
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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 daccolletage. 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: 82.00€
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.
Great vit c but was confused which version
I thought I was buying the luxe version which I got in a calendar but actually was this version, the bottles look v similar it’s confusing, that’s my only criticism, otherwise it’s a fab serum and love it
Report this reviewGood!
I got this for free and just finished it! It feels like an oil and has a very mild scent. Unlike other vitamin c serums Ive tried, it does not tingle so I believe even sensitive skin could benefit from it.
Report this reviewSerum C Tetra
Excellent fresh face every day! Put it in the morning on my face. Like it a lot!!
Report this reviewToo heavy
Sadly this serum doesn’t work for my skin. I have combined skin and I think it’s a pretty heavy serum. It does not absorb well into my skin. If you have very dry skin, this might be a good serum for you!
Report this reviewStays tacky forever
I won't repurchase. I usually don't shy away from face oils but this one is too rich for my skin, which is normal-dry. The smell is great (sweet citrus), the packaging is great with a steady dropper. I'm also unable to incorporate this easily in the rest of my routine (oils go the very last, but you can't combine oils with SPF). I don't find this product terrible at all, but it's just not for me.
Report this reviewTetra c serum review
I have never had such a specific vit c serum as it! Sensitive skin would love it!
Report this reviewC-Tetra Serum Review
Structure of this serum is different than any i have ever had. Sensitive type of skin would love it!
Report this reviewOrange scent heaven
I love the serum by Medik8. Its the scent of orange and it gets me everytime. I love putting it on and that scent is amazing. The actual serum is clear and a little goes a long way. I always put a suncream on when I use this. I would recommend it.
Report this reviewDecent, but not for everyone
This is a very high quality product and works well for those with dryer skin. It absorbs rather slowly and tha t needs to be kept in mind when layering other products after this. A good c-vitamin, however I prefer my serums less oil heavy, especially as I have multiple products in my routine
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