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  • C-Tetra® Advanced

C-Tetra® Advanced

SKU:
£69.00
£69.00
Unavailable
per item

20% Vitamin C Gel-Serum With Phyto Exosomes

Benefits: Brighten-Even-Protect

Size 30ml


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Defend against premature skin ageing and achieve accelerated visible skin brightening. 

With a next-generation combination of 20% vitamin C and cutting edge phyto exosomes that help shield and improve the skin's recovery from exposure to environmental stressors which can cause premature ageing.

Clinically proven to brighten skin and visibly improve wrinkles in 7 days[1] with 0% barrier disruption[1], C-Tetra Advanced is engineered for high-performance visible brightening, skin smoothing, and daily antioxidant defence. 

This intelligent ingredient complex combines potent, stabilised 20% vitamin C with restorative phyto exosomes and omni-antioxidant acetyl zingerone to neutralise the ageing effects of free radicals. 
​

The result? A high-performance, age-defying vitamin C serum that works smarter, not harsher.

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.

PROVEN RESULTS

  • 7
  • days to visibly brighter skin[1]
  • 7
  • days to visibly reduced wrinkles[1]
  • 0%
  • barrier disruption[1]
  • 7
  • days to visibly smoother skin texture[1]
  • 90%
  • reduction of pollution damage to the skin’s surface[2]

[1] Proven via independent clinical study conducted over 4 weeks on 32 participants. [2] Proven via in vitro protein carbonylation data against particulate matter pollution on the stratum corneum and epidermis. [3] Proven via in vitro protein carbonylation study using European standard reference environmental pollutants


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 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.

FULL INGREDIENTS

Aqua (Water), Tetrahexyldecyl Ascorbate, Isododecane, Propanediol, Acetyl Glucosamine, Squalane, Tocopherol, Acetyl Zingerone, Camellia Sinensis (Green Tea) Leaf Vesicles, Hydroxyacetophenone, Sodium Hyaluronate, Cellulose, Avena Sativa (Oat) Kernel Extract, Glycerin, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Citrus Grandis (Grapefruit) Peel Oil, Sucrose Stearate, Tetrasodium Glutamate Diacetate, Ethylhexylglycerin, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Sodium Benzoate, Cellulose Gum, 1,2-Hexanediol, Polysorbate 60, Sorbitan Isostearate, Citric Acid, Phenoxyethanol, Citral, Linalool, Limonene

THE SCIENCE BEHIND THE FORMULA

​
Traditional high-strength vitamin C serums can degrade before reaching the skin or cause irritation. C-Tetra Advanced is meticulously formulated with a 20% stabilised vitamin C complex, ensuring long-lasting potency from the first drop to the last. 

Encapsulated by nature and sourced from green tea leaves, phyto exosomes are rich in proteins, lipids, and messenger molecules. Acting as intelligent micro-carriers they carry key signalling molecules, like peptides and nutrients, to send signals to skin cells to help reinforce the skin barrier for optimal skin tolerance and comfort. 
​
Further fortified by omni-antioxidant acetyl zingerone, the next-generation formula helps shield skin from pollution-induced damage by neutralising free radicals, blocking harmful pollution particles, and strengthening the skin’s natural defences for increased skin resilience.


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


Works Well With...

Skin Youth Biome

£12.00 - £61.00
Our new and improved award-winning gut health supplement supports the gut-skin connection and targets ageing skin for a youthful complexion.

​Benefits
  • Works from the inside out
  • Supports the skin's natural barrier
  • Helps reduce fine lines
  • Helps support gut flora
  • Supports collagen formation*
  • Supports immunity*
  • *Vitamin C contributes to the maintenace of normal skin and the normal function of the immune system
  • *Vitamin C contributes to the normal production of collagen

     
Shop

et al. RADIANT PRIMER & ANTI-POLLUTION SERUM

£38.00
PROTECTS + BRIGHTENS + CHELATES METALS


Hydrating serum-like texture, smooths + blurs the skin to create the perfect canvas for any foundation
+ Improves the wear and longevity of makeup
+ Gives the skin a luminous radiant finish
Shop

Crystal Retinal®

£45.00 - £109.00
Award-winning Age-Defying Vitamin A Night Serum
11x More Effective than Retinol

Benefits:
Renew
Firm
Smooth
30ml Tube
(100 Uses Per Tube)


Shop

Crystal Retinal® Ceramide Eye

£42.00 - £70.00

Smooth & Lift Eye Cream Gentle-Release Vitamin A


"Delivers clinically proven results - without irritation."


Benefits: Smooth-Brighten-Lift


Size 15ml

100 Uses Per Tube

Shop
get your free personalised product plan here

01624 848188

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  • Home
    • About >
      • Meet The Team
      • Opening Times
      • Contact
    • Policies
  • Online Shop
    • Personalised Product Recommendations
    • gift vouchers
    • Medik8 Skincare >
      • CSA Philosophy
      • By Product Type >
        • Serums
        • Moisturisers
        • Cleansers
        • Eyes
        • Sunscreen
        • Travel
        • Exfoliating Acids
      • By Skin Concern >
        • Fine Lines & Wrinkles
        • Dry & Dehydrated Skin
        • Blemish & Acne Prone Skin
        • Hyperpigmentation & Dark Spots
        • Redness
        • Enlarged Pores
      • By Ingredient >
        • Vitamin C
        • Sunscreen
        • Vitamin A (Retinoids)
        • Hyaluronic Acid
        • Peptides
    • Advanced Nutrition Programme Skin Supplements >
      • Key Ingredient >
        • Biome
        • Collagen
        • Omegas
        • Vitamin C
        • Antioxidant
        • Vitamin A /Betacarotene
        • Multivitamin
        • Magnesium
        • Zinc
      • Skin Concerns >
        • Ageing
        • Dry
        • Problem
        • Oily
        • Sensitive
        • Uneven Tone
        • Hair + Nails
        • Daily Skin Health
      • Wellbeing >
        • Gut Support
        • Bones, Joints & Teeth Health
        • Immunity
        • Mental Vitality
        • Energy
        • Detox
        • General Wellbeing
        • Menopause Support
    • et al. MakeUp >
      • et al. ALL ITEMS
      • et al. PRIMER
      • et al. CONCEALER
      • et al. FOUNDATION
      • et al. 3IN1 MIST
      • et al. LIPS
      • et al. LINE + DEFINE EYELINER
      • et al. VERSATILE BLUSH
      • et al. COMPLEXION GLOW
      • et al. ACCESSORIES
      • et al. BRUSHES
  • HydraFacial™
  • Online Booking & Treatment List
  • Promotions
  • Black Friday 2025