Free delivery on orders over £100
Official stockist
Next day delivery | Order weekdays before 3pm
Flexible payment options
Free ongoing skincare support

Medik8

C-Tetra
£42.00 50ml

Flexible payment options including

Key Benefits

  • Provides hydration.
  • Packed with antioxidants and DNA repair enzymes to protect skin and battle against environmental aggressors, oxidative stress and pollutants.
  • Retinol helps improve the texture of skin, softening fine lines and wrinkles, brightening imperfections for an overall smoother complexion.
  • Repairs DNA damage and protects skin against future damage.
  • Strengthen skin’s barrier for long-term healthier and stronger skin.
  • Speeds up skin’s natural recovery system.
Targets
  • Sensitive skin Sensitive skin
  • Dull skin Dull skin
  • Pigmentation Pigmentation
  • Ageing skin Ageing skin
When to use
  • Morning Morning
Product details

Boost Your Skin’s Radiance in Just 7 Days with Medik8 C-Tetra.

 

Looking for a gentle way to brighten your skin? Medik8’s cult-favourite C-Tetra serum is designed to reveal a more radiant, even-looking complexion in as little as one week.*

Powered by 7% stabilised vitamin C (tetrahexyldecyl ascorbate), this lightweight daily serum helps to smooth the appearance of fine lines and wrinkles while improving uneven skin tone. Its gentle formula makes it an ideal introduction to vitamin C for those with sensitive skin or anyone new to active skincare.

 

Enriched with vitamin E, C-Tetra also helps to shield your skin from free radical damage caused by pollution, UV exposure and everyday stressors — keeping your complexion looking youthful, healthy, and protected.

Perfect for everyday use, this antioxidant serum is a great first step towards brighter, more resilient skin.

 

*Based on an independent consumer trial of 52 participants over 4 weeks.

Directions for use
  • Each morning after cleansing, apply 4 drops of serum to your face, neck, and décolletage, gently massaging it in.
  • Allow the serum to fully absorb before following with your daily SPF.
  • For best results, try pairing with Medik8 Advanced Day Ultimate Protect sunscreen.
Key ingredients
  • 7% Stabilised Vitamin C (tetrahexyldecyl ascorbate) - A gentle yet effective form of vitamin C that helps shield skin from free radical damage, boosts collagen production, and restores a brighter, more even-toned, youthful-looking complexion.
  • Vitamin E - A potent antioxidant that helps defend skin from the visible ageing effects of free radicals. It also works in synergy with vitamin C to enhance its brightening and protective benefits for optimal results.
All 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. Please note: This ingredient list is sourced directly from the brand's website. While we make every effort to ensure the information is accurate and up to date, formulations may change over time. For the most current and reliable details, please contact us at hello@myfacedr.com.

You may also like

Bestseller Consult Product
ZO Daily Power DefenseZO Daily Power Defense
ZO Daily Power Defense
£125
Bestseller Consult Product
ZO Complexion Renewal PadsZO Complexion Renewal Pads
ZO Complexion Renewal Pads
£50
Bestseller Consult Product
ZO Exfoliating CleanserZO Exfoliating Cleanser
ZO Exfoliating Cleanser
£43
Bestseller
Professional-C® Serum 20%Professional-C® Serum 20%
Professional-C® Serum 20%
£170
Watch the video

Experts explain 

Learn more from Medik8 about C-Tetra Serum on YouTube.

Experts explain

Reviews

C-Tetra FAQs

What is Medik8 C-Tetra and what does it do?

Medik8 C-Tetra is a lightweight daily serum with 7% stabilised vitamin C and vitamin E. It helps brighten dull skin, smooth fine lines, improve uneven tone, and protect against free radical damage caused by pollution, UV rays, and everyday stressors.

Is Medik8 C-Tetra suitable for sensitive skin?

Yes, C-Tetra is formulated with a gentle, low-irritation form of vitamin C, making it ideal for sensitive skin or anyone new to vitamin C serums. It delivers visible results without the common stinging or redness sometimes associated with stronger vitamin C products.

How do I use Medik8 C-Tetra?

Apply 4 drops to your face, neck, and décolletage after cleansing each morning. Gently massage in and allow the serum to absorb before applying sunscreen. For best results, pair with Medik8 Advanced Day Ultimate Protect.

Can I use Medik8 C-Tetra with other skincare products?

Yes! C-Tetra works well alongside most serums and moisturisers. It is often paired with hyaluronic acid for added hydration and followed by sunscreen during the day. In the evening, you can use it as part of Medik8’s CSA philosophy alongside a vitamin A (retinol) product.

When will I see results from Medik8 C-Tetra?

Most people notice brighter, more radiant skin within 7 days of daily use.* Continued use helps improve the appearance of fine lines, uneven tone, and overall skin texture over time.

Can I use Medik8 C-Tetra while pregnant or breastfeeding?

Vitamin C is generally considered safe to use during pregnancy and breastfeeding. However, we recommend speaking with your Skin Expert before introducing any new skincare products.

Does Medik8 C-Tetra replace sunscreen?

No, definitely not. While C-Tetra provides antioxidant protection, it does not shield skin from UV rays. Always follow with a broad-spectrum SPF during the day to protect your skin fully.

Is Medik8 C-Tetra vegan and cruelty-free?

Yes. Medik8 C-Tetra is both vegan-friendly and cruelty-free, making it a great option for those seeking ethical skincare.
Care that's more than skin deep

Hit your skin goals, speak to our experts

Meet our team
Face Dr Hero Media
Decal

Review from our community

Go Close