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  • C-Tetra®

C-Tetra®

SKU:
£42.00
£42.00
Unavailable
per item
Lipid 7% Vitamin C Radiance Serum
Benefits: Brighten-Even-Renew
200 uses per bottle
30ml
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Restore the look of skin radiance in just 7 days* with cult-favourite C-Tetra.

Formulated with a stabilised form of vitamin C (7%) called tetrahexyldecyl ascorbate (pronounced 'tetra-hexul-deckul as-CORR-bate'), this lightweight serum works to visibly brighten uneven skin tone and reduce the look of fine lines and wrinkles, while remaining gentle on sensitive skin.

Fortified with vitamin E, this antioxidant powerhouse also protects the skin against the ageing and damaging effects of free radicals for a more youthful and healthy-looking complexion overall. The perfect option for those who are new to vitamin C, or those with sensitive skin.


*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin.

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.

PROVEN RESULTS

​
  • 7days to restored skin radiance*
  • 7days to visibly brighter smoother skin*
  • 96%of sensitive skins agreed C-Tetra was gentle on the skin*
  • 4weeks 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.


HOW TO 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. We recommend Advanced Day Ultimate Protect.


KEY INGREDIENTS


  • 7% Stabilised Vitamin C (tetrahexyldecyl ascorbate)

    A low-irritation form of vitamin C that delivers exceptional antioxidant protection against harmful free radical damage while brightening and supporting collagen production for a visibly even, more youthful-looking complexion.



  • 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 INGREDIENTS

​
Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.

THE SCIENCE BEHIND THE FORMULA

It is exceptionally difficult to formulate a vitamin C serum that will retain its power over time. That's because vitamin C is notoriously unstable, meaning its effectiveness can be compromised when it comes into contact with light, heat or air.
That's why we have chosen to formulate C-Tetra with an extremely stable form of vitamin C (tetrahexyldecyl ascorbate), so you can be sure that your vitamin C is still as potent and effective 12 months after you first opened it.


GOOD TO KNOW

  • NO ARTIFICIAL FRAGRANCE
  • NO SYNTHETIC COLOURS
  • PARABEN FREE
  • CERTIFIED BY THE VEGAN SOCIETY


Works Well With...

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"
A true Medik8 favourite, this silky transformative oil is our ultimate double cleanse hero."
​

​Benefits: Balance-Nourish-Condition


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Calmwise™ Serum

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Crystal Retinal® Ceramide Eye

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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