C-Tetra Advanced

C-Tetra Advanced is the strongest vitamin C serum in the Medik8 range — 20% stable vitamin C paired with phyto exosomes, a next-generation delivery technology that improves how the active is taken up by the skin.

It delivers visibly brighter, more even-toned skin and meaningful antioxidant defence against environmental damage, in a lightweight gel-serum that layers cleanly under SPF.

For established vitamin C users. If you are new to vitamin C, start with C-Tetra.

BEST FOR - Established pigmentation and uneven tone - Dullness that hasn't responded to lower-strength vitamin C - Environmental and sun-related skin damage - Loss of radiance and firmness - Experienced vitamin C users wanting maximum strength

KEY INGREDIENTS - Tetrahexyldecyl Ascorbate (20%) — the highest vitamin C concentration in the range - Phyto Exosomes — plant-derived delivery technology for improved uptake - Vitamin E — enhances antioxidant performance

USAGE INSTRUCTIONS Apply 3–4 drops to clean, dry skin each morning before moisturiser and SPF.

If you are new to high-strength vitamin C, begin every other morning and build to daily use. Always follow with SPF 30 or higher.