Medik8 C-Tetra

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Shipped to 50,000+ customers worldwide

Chosen to sit alongside a microneedling routine rather than replace it.

$53.00 USD

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Order today and it goes out tomorrow, 23 Oct. We pack and ship seven days a week, weekends included.

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Delivered26 Oct–28 Oct

Registered to 50,000+ owners worldwide · rated 5.0 from 1,600+ verified reviews

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Lipid 7% Vitamin C Radiance Serum

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.

Key Benefits

Increased Skin Youthfulness – Proven to simultaneously smooth the look of fine lines and wrinkles while visibly boosting skin glow and radiance.
Lightweight Nourishment – This jojoba seed oil-based formula delivers effective yet non-greasy nourishment for visibly softer and comforted skin.
Brighter, More Even Complexion – Proven to visibly brighten the skin tone, for a more even and healthy-looking skin appearance.

Proven Results

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

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

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