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Medik8

Medik8 C-Tetra Advanced – 20% Vitamin C Serum

Regular price
£57.60
Regular price
£72.00
Sale price
£57.60
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An advanced morning gel-serum formulated with 20% stabilised vitamin C, phyto exosomes and acetyl zingerone for daily antioxidant defence.

Key benefits

  • Helps brighten and even the look of skin tone
  • Helps smooth skin texture and visibly improve the look of wrinkles
  • Provides daily antioxidant defence against environmental stressors, including pollution
  • Formulated to be gentle on the skin barrier, with hyaluronic acid and N-acetyl glucosamine
  • Lightweight gel-serum texture that layers easily under moisturiser and sunscreen

Who it is for

Suitable for all skin types, and especially for skin showing visible signs of ageing. Its 20% vitamin C is a gentle stabilised form (tetrahexyldecyl ascorbate), so it is suitable even if you are new to vitamin C. As with any active, introduce it gradually.

How to use

In the morning after cleansing and toning, massage 2–3 pumps across the face, neck and décolletage. Follow with moisturiser and always finish with sunscreen. If you use other serums, apply them from thinnest to thickest: C-Tetra Advanced is an emulsion, so it goes on top of water-based and oil-based serums. If you are new to it, patch test at least 24 hours before first use. Avoid the eye area and use on unbroken skin only.

Please note: it contains a natural citrus fragrance from grapefruit essential oil. Medik8 cannot give advice on pregnancy or breastfeeding and recommends speaking to your GP or midwife before use.

Why Dr Mo recommends it

A high-strength vitamin C that is formulated to be gentle on the skin barrier, making it a good choice for routines that already include well-tolerated active skincare.

Complete your routine

Browse our vitamin C serums and skincare and finish with a broad-spectrum SPF.

Dr Motox is an official stockist of Medik8. Explore personalised skincare advice.

HOW TO USE

First-time use

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

How to use

Apply as part of your morning skincare routine. Massage 2-3 pumps across the face, neck and décolletage. Follow with moisturiser and always finish with sunscreen.

KEY BENEFITS

Dramatic Skin Brightening
Clinically proven to visibly brighten skin and even tone in 7 days for a radiant, luminous complexion. [1]

Enhanced Skin Barrier Support
Powerful phyto exosomes deliver replenishing bioactives to skin cells rapidly & effectively, ensuring 0% barrier disruption. [1]

Premature Skin Ageing Defence
Shields skin from damaging free radicals, pollution, and daily environmental stressors to help defend against premature skin ageing.

Smooth & Even Complexion
Clinically proven to visibly improve skin smoothness and texture in 7 days, leaving a soft, polished finish. [1]

Lightweight Finish
The fast-absorbing gel-serum texture hydrates, smooths, and primes, leaving skin instantly refreshed and ready for the day ahead.

KEY INGREDIENTS

20% Stabilised Vitamin C (Tetrahexyldecyl Ascorbate)
A highly potent yet gentle form of vitamin C for dramatic skin brightening and powerful antioxidant protection against premature skin ageing.

Phyto Exosomes
Encapsulated by nature, our phyto exosomes intelligently deliver proteins, lipids, and messenger molecules to skin cells. Together, alongside our supercharged vitamin C, they help prevent & reduce premature skin ageing by supporting healthier-looking, more resilient skin.

Acetyl Zingerone (pronounced ‘a-sea-tul’)
A super-antioxidant that works synergistically with vitamin C, enhancing its efficacy while neutralising ageing free radicals and shielding skin from environmental stressors.

Hyaluronic Acid
Draws moisture into the skin to instantly plump and deeply hydrate for a soft, supple complexion.

N-Acetyl Glucosamine (NAG)
A barrier-supporting, gentle, skin-refiner that smooths the look of pores while helping to increase the skin’s own natural hyaluronic acid levels over time.

GOOD TO KNOW

CLINICALLY PROVEN

ARTIFICIAL FRAGRANCE FREE

DERMATOLOGICALLY TESTED

PROVEN GENTLE FORMULA

CERTIFIED BY THE VEGAN SOCIETY

NON-COMEDOGENIC

TESTED ON ALL SKIN TYPES & TONES

Medik8 C-Tetra Advanced Vitamin C serum for brightening and antioxidant skincare, featuring a dropper bottle with serum inside.
Medik8 C-Tetra Advanced 20% Vitamin C serum bottle for skincare
Medik8 C-Tetra Advanced vitamin C serum bottle with dropper for skincare, highlighting the Medik8 brand and product packaging.
Medik8 C-Tetra Advanced 20% Vitamin C serum in a clear bottle with dropper, designed for skincare and skin brightening.
Medik8 C-Tetra Advanced 20% Vitamin C serum bottle for skincare routines