• Medik8 C-Tetra® Serum skincare bottle with dropper applicator, designed to brighten and protect skin with vitamin C, in sleek packaging.
  • Medik8 C-Tetra® serum bottle, a skincare product with a white and orange label, designed to boost skin radiance and antioxidant protection.
  • Medik8 C-Tetra® serum in a clear bottle with dropper, designed for skincare and vitamin C antioxidant protection.
  • Medik8 C-Tetra® Serum bottle with dropper, skincare product for brightening and antioxidant protection from Medik8.
  • C-Tetra® official UK image 2
  • C-Tetra® official UK image 3
  • C-Tetra® official UK image 4
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Medik8

Medik8 C-Tetra® – 7% Vitamin C Serum

£40.50
£45.00
£40.50
Tax included. Shipping calculated at checkout.

A gentle daily 7% vitamin C serum for brighter-looking skin and antioxidant support.

Medik8 C-Tetra is a lightweight morning serum designed for vitamin C beginners and sensitive skin types. It helps improve the appearance of dullness and uneven tone while supporting the skin against environmental free-radical damage.

Why you’ll love it

  • Contains 7% stabilised vitamin C
  • Helps visibly brighten uneven skin tone
  • Supports smoother-looking skin and the appearance of fine lines
  • Provides daily antioxidant support
  • Lightweight and easy to layer into a morning routine

Who it’s for

A good starting point for new vitamin C users and people who want a gentler antioxidant serum.

How to use

Apply in the morning after cleansing. Follow with moisturiser if needed and finish with sunscreen.

Frequently asked questions

What strength is C-Tetra?
It contains 7% stabilised vitamin C.

Is it suitable for beginners?
Yes. It is designed as an approachable daily vitamin C serum.

When should I use it?
Use it in the morning before moisturiser and sunscreen.

What if my skin is sensitive?
Introduce it gradually and reduce frequency if dryness or irritation develops.

Why Dr Mo recommends it

It is a simple way to add daily antioxidant support without starting with a very high-strength vitamin C formula.

Introduce active skincare gradually. Maintain good hydration and reduce frequency if dryness or irritation develops.
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.

Step 1

After cleansing in the morning, massage 4 drops across the face, neck and décolletage.

Step 2

Leave to absorb before applying sunscreen.
KEY BENEFITS

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

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

Lightweight Nourishment
This jojoba (pronounced 'huh-hoh-ba') seed oil-based formula delivers effective yet non-greasy nourishment for visibly softer and comforted skin.
KEY INGREDIENTS

7% Stabilised Vitamin C (Tetrahexyldecyl Ascorbate)
A stable, gentle form of vitamin C that provides antioxidant protection while helping to brighten uneven-looking skin and support a more youthful-looking complexion.

Vitamin E
An antioxidant that complements vitamin C, helping to protect against free-radical damage and support optimum visible results.
GOOD TO KNOW

NO ARTIFICIAL FRAGRANCE

NO SYNTHETIC COLOURS

PARABEN FREE

CERTIFIED BY THE VEGAN SOCIETY
Medik8 C-Tetra® Serum skincare bottle with dropper applicator, designed to brighten and protect skin with vitamin C, in sleek packaging.
Medik8 C-Tetra® serum bottle, a skincare product with a white and orange label, designed to boost skin radiance and antioxidant protection.
Medik8 C-Tetra® serum in a clear bottle with dropper, designed for skincare and vitamin C antioxidant protection.
Medik8 C-Tetra® Serum bottle with dropper, skincare product for brightening and antioxidant protection from Medik8.
C-Tetra® official UK image 2
C-Tetra® official UK image 3
C-Tetra® official UK image 4