A brown bottle of Medik8 C-Tetra® Luxe serum with a dropper, liquid drops, an award badge, and "Dermatologist Recommended" text on a white background—formulated with vitamin C to enhance radiance and target fine lines.
A woman with glowing skin applies Medik8 C-Tetra® vitamin C serum to her cheek, highlighting skincare benefits like radiance, brightness, youthfulness, and nourishment in just seven days.
A woman smiles while holding Medik8's C-Tetra® Luxe, a skincare serum infused with Vitamin C, promising a healthy glow after one use, reduced wrinkles and hyperpigmentation, and a strengthened skin barrier.
Side-by-side comparison of a forehead before and after using Medik8 C-Tetra® Luxe for 4 weeks, highlighting reduced wrinkles and diminished hyperpigmentation. Text notes that 86% rate it as the best Vitamin C serum they’ve tried.
Medik8's C-Tetra® serum is shown with details on its vitamin C concentration and lightweight texture, designed to enhance skin radiance and reduce fine lines and wrinkles.
Medik8's skincare guide, "How to Layer," suggests steps like Cleanse, Tone, C-Tetra® Luxe for antioxidant protection, and Sunscreen marked with a sun icon for AM. Expert tips highlight using vitamin A at night to boost skin radiance.
Medik8's C-Tetra® Luxe comparison chart showcases creams and serums with different vitamin C percentages to boost skin radiance and provide antioxidant protection.
A woman in a white lab coat holds a Medik8 C-Tetra® bottle beside a quote endorsing Medik8’s brightening C-Tetra® vitamin C serum, attributed to Dr. Bibi Ghalaie, Cosmetic Physician.
An image illustrating the CSA Philosophy by Medik8: C-Tetra® Luxe for skin radiance (AM), antioxidant protection with sunscreen (AM), and Vitamin A cream for renewal (PM).
A brown dropper bottle labeled "Medik8 C-Tetra® Luxe" is displayed next to its white box packaging. It contains 30ml of lipid vitamin C, designed to boost skin radiance and provide antioxidant protection.
C-Tetra Luxe Try Me - With Carton - Grey Background
A brown bottle of Medik8 C-Tetra® Luxe serum with a dropper, liquid drops, an award badge, and "Dermatologist Recommended" text on a white background—formulated with vitamin C to enhance radiance and target fine lines.
A woman with glowing skin applies Medik8 C-Tetra® vitamin C serum to her cheek, highlighting skincare benefits like radiance, brightness, youthfulness, and nourishment in just seven days.
A woman smiles while holding Medik8's C-Tetra® Luxe, a skincare serum infused with Vitamin C, promising a healthy glow after one use, reduced wrinkles and hyperpigmentation, and a strengthened skin barrier.
Side-by-side comparison of a forehead before and after using Medik8 C-Tetra® Luxe for 4 weeks, highlighting reduced wrinkles and diminished hyperpigmentation. Text notes that 86% rate it as the best Vitamin C serum they’ve tried.
Medik8's C-Tetra® serum is shown with details on its vitamin C concentration and lightweight texture, designed to enhance skin radiance and reduce fine lines and wrinkles.
Medik8's skincare guide, "How to Layer," suggests steps like Cleanse, Tone, C-Tetra® Luxe for antioxidant protection, and Sunscreen marked with a sun icon for AM. Expert tips highlight using vitamin A at night to boost skin radiance.
Medik8's C-Tetra® Luxe comparison chart showcases creams and serums with different vitamin C percentages to boost skin radiance and provide antioxidant protection.
A woman in a white lab coat holds a Medik8 C-Tetra® bottle beside a quote endorsing Medik8’s brightening C-Tetra® vitamin C serum, attributed to Dr. Bibi Ghalaie, Cosmetic Physician.
An image illustrating the CSA Philosophy by Medik8: C-Tetra® Luxe for skin radiance (AM), antioxidant protection with sunscreen (AM), and Vitamin A cream for renewal (PM).
A brown dropper bottle labeled "Medik8 C-Tetra® Luxe" is displayed next to its white box packaging. It contains 30ml of lipid vitamin C, designed to boost skin radiance and provide antioxidant protection.
C-Tetra Luxe Try Me - With Carton - Grey Background
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Fine lines & wrinkles

C-Tetra® Luxe

  • Brighten
  • |
  • Smooth
  • |
  • Nourish
Lipid 14% Vitamin C Enhanced Radiance Serum

Supercharge your skin's radiance each morning with C-Tetra Luxe; clinically proven to reduce the appearance of wrinkles and hyperpigmentation in just 4 weeks.*

It also works to boost visible radiance while supporting the skin barrier.

Featuring twice the amount of vitamin C (14%) of our original C-Tetra serum, C-Tetra Luxe is ideal for those looking for enhanced skin radiance and antioxidant protection alongside deep nourishment.

The velvety-soft serum is formulated with a stabilised (and therefore very potent) form of vitamin C called tetrahexyldecyl ascorbate (pronounced 'tetra-hexul-deckul as-CORR-bate'), which delivers proven results after just 1 use*; all with a gentle, nourishing experience for your skin.

*Proven via independent clinical study on C-Tetra Luxe conducted over 4 weeks on 36 participants
Select a Size
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You can also enjoy lots of exclusive benefits from secret promotions, free shipping and a gift on your birthday.

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Reasons to shop Medik8

Free ACS delivery in Cyprus
10% off your first order with newsletter signup
Easy 30 day returns
A white tube of Medik8's Advanced Day Ultimate Protect™ moisturizer SPF 50+, featuring DNA repair enzymes, sits elegantly against a swirled cream backdrop, promising a non-comedogenic finish.
Advanced Day Ultimate Protect™
  • Protect
  • |
  • Repair
  • |
  • Hydrate
 Age-Defying Moisturiser with Photolyase SPF 50+ | PA++++
Full Size (50ml)
Key Benefits
Instant Skin Youthfulness

Boosted with optimised red ginseng for proven skin-brightening and youth-boosting power.

Total Skin Nourishment

Enhanced with squalane and vitamin F for deep moisturisation and clinically proven skin barrier support.

Dark Spot Reduction

Delivers powerful, clinically proven action on the appearance of dark spots.

Proven Results
BEFORE
AFTER 8 WEEKS
BEFORE
AFTER 8 WEEKS
1 hour to visibly brighter, more youthful-looking skin*
7 days to improved skin radiance*
81% agree visible hyperpigmentation had reduced in just 4 weeks*
94% noticed smoother and softer skin after just 1 use*
86% reported it was the best vitamin C serum they had ever used*
*Proven via independent clinical study on C-Tetra Luxe conducted over 4 weeks on 36 participants
How to Use

Step 1

After cleansing in the morning, massage 6 drops of C-Tetra Luxe across the face, neck and décolletage.

Step 2

Leave to absorb before applying sunscreen. We recommend Advanced Day Ultimate Protect.

Guide to Layering
Step 1: Cleanse
Medik8
Morning
Evening
Surface Radiance Cleanse™
Select a Size
Step 2: Brighten
A brown bottle of Medik8 C-Tetra® Luxe serum with a dropper, liquid drops, an award badge, and "Dermatologist Recommended" text on a white background—formulated with vitamin C to enhance radiance and target fine lines.
Morning
C-Tetra® Luxe
Select a Size
Step 3: Target
The Medik8 Cyprus Liquid Peptides Advanced MP serum comes in a black bottle with a pump and is surrounded by four 2025 beauty award badges, promising noticeable wrinkle reduction and a filler-like effect.
Morning
Evening
Liquid Peptides Advanced MP
30ml
Step 4: Renew
Medik8 Crystal Retinal® anti-aging serum, shown with a peach cream smear, is the No.1 retinal serum worldwide and has won over 45 global awards.
Evening
Crystal Retinal®
Select a Strength
Step 5: Moisturise
Total Moisture Daily Facial Cream Refill™
Morning
Evening
Total Moisture Daily Facial Cream™
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Key Ingredients
14% Stabilised Vitamin C (tetrahexyldecyl ascorbate)

A low-irritation form of vitamin C that delivers exceptional antioxidant protection against harmful free radical damage while supporting collagen production for a visibly even, more youthful-looking complexion.

Squalane

An almost skin-identical lipid which helps to support the natural skin barrier by nourishing the complexion.

Maracuja (pronounced 'marra-KU-ja') Oil

Naturally rich in nutrients and fatty acids, maracuja oil deeply nourishes your skin while providing additional antioxidant protection against free radical damage.

Optimised Red Ginseng

Boosts the serum’s brightening powers while stimulating collagen production for more youthful-looking skin.

Maracuja (pronounced 'marra-KU-ja') Oil

Naturally rich in nutrients and fatty acids, maracuja oil deeply nourishes your skin while providing additional antioxidant protection against free radical damage.

Optimised Red Ginseng

Boosts the serum’s brightening powers while stimulating collagen production for more youthful-looking skin.

Vitamin E

A powerful antioxidant that provides additional antioxidant protection against the ageing effects of free radicals. It also helps to boost the power of vitamin C for optimum visible results.

Full List of Ingredients
C-Tetra® Luxe
Lipid 14% Vitamin C Enhanced Radiance Serum

Squalane, Simmondsia Chinensis (Jojoba) Seed Oil, Tetrahexyldecyl Ascorbate, Dimethicone, Candida Bombicola/Glucose/Methyl Rapeseedate Ferment, Citrus Grandis (Grapefruit) Peel Oil, Ethyl Linoleate, Passiflora Edulis (Passion Fruit) Seed Oil, Tocopheryl Acetate, Helianthus Annuus (Sunflower) Seed Oil, Olea Europaea (Olive) Fruit Oil, Panax Ginseng Root Oil, Prunus Amygdalus Dulcis (Sweet Almond) Oil, Prunus Armeniaca (Apricot) Kernel Oil, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.

*Although we try our best to ensure this list of ingredients is accurate there may be product upgrades from time to time, or slight variants between different regions based on local laws, meaning the only definitive ingredient list is that which is printed on the product packaging.
  • Dermatologically tested
  • Clinically proven formula
  • No artificial fragrance
  • No synthetic colours
  • Paraben free
  • Alcohol free
  • Certified by the vegan society
Experts Recommended

Your skin needs this like the desert needs the rain!

POLLY VERNON
Features Writer - The Times

Luxurious and non-irritating...I love this product!

BRIAN R
Verified Medik8 Customer

The Vitamin C Serum Range

A brown bottle labeled "C-Tetra®" by Medik8, with a black dropper, is displayed on a white background alongside clear liquid drops. This vitamin C-rich antioxidant serum enhances skin radiance.
Morning
C-Tetra®
Full Size (30ml) | €56
Strength

7% Stabilised Vitamin C

Texture

Lightweight oil

Skin Types

New to Vitamin C, Sensitive skin

Benefits
  • Brightens
  • Ultra gentle
Key Ingredients
  • 7% Tetrahexyldecyl Ascorbate
  • Vitamin E
A brown bottle of Medik8 C-Tetra® Luxe serum with a dropper, liquid drops, an award badge, and "Dermatologist Recommended" text on a white background—formulated with vitamin C to enhance radiance and target fine lines.
Morning
C-Tetra® Luxe
Full Size (30ml) | €82
Strength

14% Stabilised Vitamin C

Texture

Rich oil

Skin Types

All skin types, First signs of ageing

Benefits
  • Brightens
  • Nourishes
  • Softens Look Of Wrinkles
Key Ingredients
  • 14% Tetrahexyldecyl Ascorbate
  • Squalane
  • Maracuja Oil
A bottle of Medik8 Cyprus C-Tetra® Advanced vitamin C serum with pump, product drops, an award badge, and a "0% Barrier Disruption" badge on a white background for skin brightening and anti-ageing.
Morning
C-Tetra® Advanced
| €89
Strength

20% Stabilised Vitamin C

Texture

Lightweight Gel-Serum

Skin Types

All skin types, Visible signs of ageing

Benefits
  • Brightens
  • Defends Against Premature Skin Ageing
  • Smooths Skin Texture
  • Visibly Improves Wrinkles
  • Advanced Pollution Protection
  • 0% Barrier Disruption
Key Ingredients
  • Phyto Exosomes
  • 20% Tetrahexyldecyl Ascorbate
  • Acetyl Zingerone
A brown bottle labeled "Medik8 Super C Ferulic™" with a dropper cap, lies on a white surface amidst spilled liquid. Text reads: "Dermatologist Recommended." Ideal for protecting against sun-induced aging and achieving skin-brightening results with its vitamin C serum.
Morning
Super C Ferulic™
Full Size (30ml) | €85
Strength

30% Stabilised Vitamin C

Texture

Rich, oil like serum

Skin Types

Advanced signs of sun induced ageing

Benefits
  • Brightens
  • Intense Dark Spot Reduction
  • Visibly Reduces Wrinkles
Key Ingredients
  • 30% Ethylated L-Ascorbic Acid
  • Ferulic Acid
  • Vitamin E
  • Turmeric Root Extract

Complete Your Regime

Reviews

Frequently Asked Questions

Can I use C-Tetra Luxe if I'm pregnant or breastfeeding?
As general guidance, this product does not contain any ingredients which we would recommend to avoid during pregnancy, unless advised by your doctor.
What vitamin C strength is C-Tetra Luxe?
C-Tetra Luxe contains 14% stabilised vitamin C (tetrahexyldecyl ascorbate).
Can I use a vitamin C serum alongside vitamin A?
Absolutely. In fact we recommend it as part of our pioneering CSA Philosophy which champions vitamin C plus sunscreen by day, vitamin A by night as the simple secret to glowing, youthful-looking skin.
Can I layer C-Tetra Luxe with Clarity Peptides in the morning?
Yes, you can. We would recommend applying C-Tetra Luxe first (an oil-based serum), followed by Clarity Peptides (an emulsion-based serum).
C-Tetra® Luxe
Full Size (30ml)
Select a Size