Medik8
Medik8 C-Tetra Advanced 30ml
Medik8 C-Tetra Advanced 30ml
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The most potent vitamin C serum in the C-Tetra range.
Medik8 C-Tetra Advanced is the pinnacle of the C-Tetra collection, delivering the highest concentration of tetrahexyldecyl ascorbate for maximum antioxidant power and visible results. Enhanced with a multi-antioxidant complex, it provides unparalleled protection against environmental aggressors while dramatically brightening, firming and rejuvenating the complexion.
Key Benefits
- Highest concentration vitamin C in the C-Tetra range
- Multi-antioxidant complex for superior protection
- Dramatically brightens and firms
- Targets fine lines, dullness and uneven tone
- Lightweight, fast-absorbing texture
- The C in the CSA Philosophy®
How to Use
Apply 2-3 drops to cleansed skin every morning before moisturiser and sunscreen. For those experienced with vitamin C.
Clinician's Note
Clinician's Note
This product has been personally reviewed and selected by our founder based on clinical evidence, ingredient efficacy, and real-world patient outcomes. If you're unsure whether this is right for your skin, start a free written skin assessment and we'll recommend the best option for you.
How to Use
How to Use
Apply as directed by the product packaging or your clinician's recommendation. For best results, use consistently as part of a complete skincare routine. Not sure about application order? Ask our clinician — it's free.
Shipping & Returns
Shipping & Returns
Dispatch: 1-2 working days
Delivery: 2-4 working days (Royal Mail tracked)
Free shipping on orders over £100
Returns: Unused, unopened products may be returned within 7 days with prior approval. Prescription items cannot be returned once dispensed.
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Complete Your CSA Routine
Vitamin C protects in the morning — add SPF to lock in that defence and a retinoid at night for the full CSA protocol.


