C-Tetra Advanced

£65.00

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.

Is 20% too strong to start with?
If you haven't used vitamin C before, start with C-Tetra at 7% and build up. Higher isn't
better if your skin can't tolerate it.

What are phyto exosomes?
Plant-derived vesicles that improve how actives are delivered into the skin. In practical
terms: more of the vitamin C gets where it's needed.

Can I use it with Crystal Retinal?
Yes — vitamin C in the morning, retinal at night.

C-Tetra Advanced

FAQ

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