Medik8 C-Tetra Luxe serum bottle shown open with its glass pipette resting against the rim, displayed on a white background with clear, translucent serum droplets. The image includes a "GET THE GLOSS BEAUTY AWARDS GOLD 2024" seal in the top left and a "DERMATOLOGIST RECOMMENDED" emblem with a magnifying glass icon in the top right.
Close-up of a smiling woman with glowing skin on a warm orange background. Text reads: ‘Clinically proven to: Healthy glow in just 1 use*. Reduces visible wrinkles and hyperpigmentation in 4 weeks*. Helps to strengthen your skin barrier.’
Before and after comparison of a participant’s forehead over 4 weeks, with a white dotted circle highlighting a visible reduction in the look of fine lines and wrinkles. The bottom of the image features a warm orange-gold background with a Medik8 C-Tetra Luxe serum bottle and the claim "86% reported that it was the best Vitamin C serum they had ever tried*."
A layering guide titled "HOW TO LAYER" on a warm orange background with bubble-like graphics. An AM sun icon indicates a morning routine consisting of four steps. The featured products and steps are: CLEANSE: Medik8 Surface Radiance Cleanse tube.TONE: Medik8 Press & Glow bottle. VITAMIN C: Medik8 C-Tetra Luxe serum bottle. SUNSCREEN: Medik8 Advanced Day Ultimate Protect tube. There is "EXPERT ADVICE" stating to follow with vitamin A in the evening to maintain maximum age-defying results.
"MEET YOUR VITAMIN C" chart on an orange gradient background with hexagonal graphics. Four Medik8 serums are shown. From left: C-Tetra dropper bottle (7% Vitamin C, for sensitive skins or beginners), C-Tetra Luxe dropper bottle (14% Vitamin C, for dry skin), C-Tetra Advanced pump bottle (20% Vitamin C, for normal, combination, and oily skin), and Super C Ferulic dropper bottle (30% Ethylated L-Ascorbic Acid, for experienced users).
Medik8 infographic titled "FIND YOUR VITAMIN C" on a light grey background. It lists six products: C-Tetra Cream jar (3% Vitamin C) for a moisturising texture. Daily Radiance Vitamin C jar (7% Vitamin C) with SPF 30. C-Tetra serum bottle (7% Vitamin C) for beginners. C-Tetra Luxe serum bottle (14% Vitamin C) for intense glow. C-Tetra Advanced pump bottle (20% Vitamin C) for visible signs of ageing. Super C Ferulic serum bottle (30% Ethylated L-Ascorbic Acid) for advanced signs of ageing.
Medik8 infographic titled "THE CSA PHILOSOPHY®" on a grey background with soft light rays, outlining a clinically proven skincare approach that addresses 90% of anti-ageing needs in 3 simple steps. Step 1: "BRIGHTENS for glowing skin" shows C-Tetra Luxe for Vitamin C (AM). Step 2: "PROTECTS for youthful skin" shows Advanced Day Ultimate Protect for Sunscreen (AM). Step 3: "RENEWS for perfected skin" shows Crystal Retinal 6 for Vitamin A (PM).
Medik8 C-Tetra Luxe serum bottle and its white cardboard carton displayed on a clean white background with soft shadows. The amber glass bottle and white box both feature the Medik8 logo and identify the product as "C-TETRA LUXE Lipid Vitamin C Enhanced Radiance Serum" in a 30mL size.
An 8ml brown glass dropper bottle of Medik8 C-Tetra Luxe serum stands next to its white packaging box on a grey surface against a white background. Text on both reads: "Medik8, C-TETRA LUXE, Lipid Vitamin C Enhanced Radiance Serum, 8mL e / 0.27 Fl. Oz.".
Medik8 C-Tetra Luxe serum bottle shown open with its glass pipette resting against the rim, displayed on a white background with clear, translucent serum droplets. The image includes a "GET THE GLOSS BEAUTY AWARDS GOLD 2024" seal in the top left and a "DERMATOLOGIST RECOMMENDED" emblem with a magnifying glass icon in the top right.
Close-up of a smiling woman with glowing skin on a warm orange background. Text reads: ‘Clinically proven to: Healthy glow in just 1 use*. Reduces visible wrinkles and hyperpigmentation in 4 weeks*. Helps to strengthen your skin barrier.’
Before and after comparison of a participant’s forehead over 4 weeks, with a white dotted circle highlighting a visible reduction in the look of fine lines and wrinkles. The bottom of the image features a warm orange-gold background with a Medik8 C-Tetra Luxe serum bottle and the claim "86% reported that it was the best Vitamin C serum they had ever tried*."
A layering guide titled "HOW TO LAYER" on a warm orange background with bubble-like graphics. An AM sun icon indicates a morning routine consisting of four steps. The featured products and steps are: CLEANSE: Medik8 Surface Radiance Cleanse tube.TONE: Medik8 Press & Glow bottle. VITAMIN C: Medik8 C-Tetra Luxe serum bottle. SUNSCREEN: Medik8 Advanced Day Ultimate Protect tube. There is "EXPERT ADVICE" stating to follow with vitamin A in the evening to maintain maximum age-defying results.
"MEET YOUR VITAMIN C" chart on an orange gradient background with hexagonal graphics. Four Medik8 serums are shown. From left: C-Tetra dropper bottle (7% Vitamin C, for sensitive skins or beginners), C-Tetra Luxe dropper bottle (14% Vitamin C, for dry skin), C-Tetra Advanced pump bottle (20% Vitamin C, for normal, combination, and oily skin), and Super C Ferulic dropper bottle (30% Ethylated L-Ascorbic Acid, for experienced users).
Medik8 infographic titled "FIND YOUR VITAMIN C" on a light grey background. It lists six products: C-Tetra Cream jar (3% Vitamin C) for a moisturising texture. Daily Radiance Vitamin C jar (7% Vitamin C) with SPF 30. C-Tetra serum bottle (7% Vitamin C) for beginners. C-Tetra Luxe serum bottle (14% Vitamin C) for intense glow. C-Tetra Advanced pump bottle (20% Vitamin C) for visible signs of ageing. Super C Ferulic serum bottle (30% Ethylated L-Ascorbic Acid) for advanced signs of ageing.
Medik8 infographic titled "THE CSA PHILOSOPHY®" on a grey background with soft light rays, outlining a clinically proven skincare approach that addresses 90% of anti-ageing needs in 3 simple steps. Step 1: "BRIGHTENS for glowing skin" shows C-Tetra Luxe for Vitamin C (AM). Step 2: "PROTECTS for youthful skin" shows Advanced Day Ultimate Protect for Sunscreen (AM). Step 3: "RENEWS for perfected skin" shows Crystal Retinal 6 for Vitamin A (PM).
Medik8 C-Tetra Luxe serum bottle and its white cardboard carton displayed on a clean white background with soft shadows. The amber glass bottle and white box both feature the Medik8 logo and identify the product as "C-TETRA LUXE Lipid Vitamin C Enhanced Radiance Serum" in a 30mL size.
An 8ml brown glass dropper bottle of Medik8 C-Tetra Luxe serum stands next to its white packaging box on a grey surface against a white background. Text on both reads: "Medik8, C-TETRA LUXE, Lipid Vitamin C Enhanced Radiance Serum, 8mL e / 0.27 Fl. Oz.".
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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.
Select a Size
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Reasons to shop Medik8

Free UK delivery over £25
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Advanced Day Ultimate Protect™
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. | Please Note: Product packaging shown may be different to the product received due to regional variations.
How to Use

First-time use

If you're new to C-Tetra Luxe, we recommend a patch test at least 24 hours before first use. Learn how to patch test here.


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 Surface Radiance Cleanse tube displayed on a clean white background with a large, translucent gel texture smear. Text identifies it as a Resurfacing AHA/BHA Mangosteen Cleansing Gel in a 150mL size.
Morning
Evening
Surface Radiance Cleanse™
Select a Size
Step 2: Brighten
Medik8 C-Tetra Luxe serum bottle shown open with its glass pipette resting against the rim, displayed on a white background with clear, translucent serum droplets. The image includes a
Morning
C-Tetra® Luxe
Select a Size
Step 3: Target
Liquid Peptides Advanced MP
Morning
Evening
Liquid Peptides Advanced MP
Full Size (30ml)
Step 4: Renew
Crystal Retinal®
Evening
Crystal Retinal®
Select a Strength
Step 5: Moisturise
An open frosted glass jar of Medik8 Total Moisture Daily Facial Cream with a peak of white cream on top, set against a clean white background. Badges in the top corners indicate it is a
Morning
Evening
Total Moisture Daily Facial Cream™
Select a Size
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 artifical 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

The Vitamin C Serum Range

A bottle of Medik8 C-Tetra Lipid Vitamin C Radiance Serum open with its dropper resting diagonally across the top. Set against a clean white background, the bottle is surrounded by three clear puddles of serum, showcasing its liquid texture.
Morning
C-Tetra®
Full Size (30ml) | £45
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
Medik8 C-Tetra Luxe serum bottle shown open with its glass pipette resting against the rim, displayed on a white background with clear, translucent serum droplets. The image includes a "GET THE GLOSS BEAUTY AWARDS GOLD 2024" seal in the top left and a "DERMATOLOGIST RECOMMENDED" emblem with a magnifying glass icon in the top right.
Morning
C-Tetra® Luxe
Travel Size (8ml) | £62
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
Medik8 C-Tetra Advanced bottle displayed on a clean white background with translucent serum droplets, highlighting its lightweight gel-serum texture.
Morning
C-Tetra® Advanced
Full Size (30ml) | £72
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
Medik8 Super C Ferulic serum bottle shown open with its glass pipette resting against the rim, displayed on a clean white background with translucent serum droplets. The amber glass bottle features the Medik8 logo and is labeled "SUPER C FERULIC Potent Vitamin C Brightening Serum" in a 30mL size.
Morning
Super C Ferulic™
Full Size (30ml) | £69
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 a cosmetics company, we are unable to provide product advice in relation to medical conditions such as pregnancy. We would recommend discussing the ingredients with your GP or midwife before use. 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.
C-Tetra® Luxe
Travel Size (8ml)
Select a Size