C-Tetra® (Travel Size)

C-Tetra Try Me With Carton Grey Background
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra Try Me Grey Background
C-Tetra Try Me With Carton Grey Background
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra® (Travel Size)
C-Tetra Try Me Grey Background
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C-Tetra® (Travel Size)

  • Brighten
  • |
  • Even
  • |
  • Renew
Lipid Vitamin C Radiance Serum

Restore radiance and fight signs of ageing with C-Tetra, a vitamin C antioxidant serum that protects against environmental stressors while brightening skin.

Please Note: Product packaging shown may be different to the product received due to regional variations
Travel Size (8ml)
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Sustainability

Provenance provides confidence for sustainability claims; helping to prevent 'green-washing' and empowering conscious consumers to purchase in line with their values. Provenance 'Proof Points' are all third party verified and evidenced through supply chains.

Product proof points

The Vegan Society- Vegan

C-Tetra is Vegan Society certified — free from animal ingredients. No animals used in the product's manufacturing or testing. Free from GMOs. Reviewed by the Vegan Society.

Partly Recyclable Packaging

Recyclable Parts: Bottle (glass) and Container (cardboard) Non-Recyclable Parts: Pipette

Brand proof points

B Corporation

Medik8 is a certified B Corporation, scoring over 80 out of 200 across Governance, Workers, Community, Environment and Customers. The certification includes a legal commitment to consider all stakeholders in decision-making. Verified every three years.

SBTi Approved Targets

Medik8 has SBTi approved science-based targets to reduce greenhouse gas emissions in line with limiting global warming to 1.5°C or well-below 2°C. Progress is reported publicly every year, with targets validated by the certifier and reviewed every 5 years.

Living Wage Employer

Medik8 is a Living Wage Employer — all staff are paid a wage calculated to meet the cost of living in the UK. Company wages are updated annually after new rates are announced by the Living Wage Foundation.

Donates to Charity

In 2022 Medik8 donated £10,000 to the National Society for the Prevention of Cruelty to Children

Carbon Measured

The footprint was calculated using GHG Protocol methodology; GWP 100.

Renewable Energy

Medik8's Innovation Centre uses electricity from 100% renewable sources.

Made in Britain

Medik8 carries the Made in Britain trademark — manufactured in the United Kingdom. Subject to facility verification and annual renewal.

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Product Details

Key Benefits

Increased Skin Youthfulness

Proven to simultaneously smooth the look of fine lines and wrinkles while visibly boosting skin glow and radiance.

Lightweight Nourishment

This jojoba seed oil-based formula delivers effective yet non-greasy nourishment for visibly softer and comforted skin.

Brighter, More Even Complexion

Proven to visibly brighten the skin tone, for a more even and healthy-looking skin appearance.

Proven Results
7 days to restored skin radiance*
7 days to visibly brighter smoother skin*
96% of sensitive skins agreed C-Tetra was gentle on the skin*
4 weeks to visibly reduced wrinkles & dark spots*
90% agree skin feels instantly softer*
*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin. | 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, 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 4 drops across the face, neck and décolletage.


Step 2

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

Key Ingredients
A clean black-and-white line icon representing stabilised vitamin C (tetrahexyldecyl ascorbate). The design features a droplet with two sparkling stars to signify the ingredient’s skin-brightening and radiance-boosting properties.

7% 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.

A clean, black-and-white line icon representing vitamin E. The design features a serum droplet with a small plus sign (+) in the top-right corner, symbolizing the ingredient’s antioxidant-boosting and stabilizing properties.

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® (Travel Size)
Lipid Vitamin C Radiance Serum

Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, 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.

Experts Recommended

Softens visible ageing concerns while being tolerable for all.

BRIDGET MARCH
Digital Beauty Director - Harper's Bazaar

My wrinkles have almost disappeared!

TATIANA S
Verified Medik8 Customer

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Reviews

C-Tetra® (Travel Size)
Travel Size (8ml)
Travel Size (8ml)