Medik8 C-Tetra® Brightening Serum is a cult-favorite serum formulated with 7% stabilized vitamin C in the form of tetrahexyldecyl ascorbate. This lightweight antioxidant concentrate restores radiance to skin in just 7 days while smoothing fine lines and wrinkles and evening out uneven tone. Enriched with vitamin E, this serum is gentle enough for sensitive skin.

Why You'll Love It

Its revolutionary formula uses a stabilized form of vitamin C — tetrahexyldecyl ascorbate — that doesn't degrade like traditional L-ascorbic acid. This means guaranteed, lasting efficacy that works consistently over time.

Unlike other vitamin C serums that can be harsh, this one is specifically formulated for sensitive skin. 96% of users confirm it's gentle even on reactive skin. Enriched with vitamin E, this serum delivers dual antioxidant protection against premature aging and free radicals.

The jojoba seed oil base provides complete nourishment without any greasy residue. Lightweight and fast-absorbing, it leaves skin visibly softer, smoother, and instantly more luminous. Results are fast and proven: 7 days to restore radiance, 4 weeks to visibly reduce fine lines.

Key Benefits

• Visibly restores radiance in 7 days
• Evens and brightens uneven skin tone
• Smooths the appearance of fine lines and wrinkles
• Lightweight, quick-absorbing texture
• Gentle for sensitive skin (96% approval)
• Protects against premature aging
• Neutralizes free radical damage
• Makes skin instantly softer
• Improves skin's youthfulness and health
• Nourishing jojoba oil base

Key Ingredients

Stabilized Vitamin C (7% - Tetrahexyldecyl Ascorbate) : stable form of vitamin C that doesn't degrade, brightens complexion and evens out imperfections

Vitamin E : powerful antioxidant that protects against free radical damage and premature aging

Jojoba Seed Oil : nourishes and soothes skin without greasiness, improves texture and softness

Additional Antioxidants : work synergistically to protect and rejuvenate skin

Proven Results

• 7 days : visibly restored radiance and luminosity
• 7 days : visibly smoother, more luminous skin
• 96% of users agree it's gentle for sensitive skin
• 4 weeks : visibly reduced fine lines, wrinkles, and imperfections
• 90% of users agree their skin is instantly softer