Medik8 C-Tetra Advanced

Name: Medik8 C-Tetra Advanced
Brand: Medik8
Price: 58.00 GBP
Availability: InStock
Rating: 5.00 (6 reviews)

£58.00

Tax included.

✓ 20% Stabilised Vitamin C + Phyto Exosomes | ✓ Visibly Brighter Skin in 7 Days | ✓ 0% Barrier Disruption

Medik8 C-Tetra Advanced is Medik8's next-generation vitamin C: a lightweight 20% stabilised vitamin C gel-serum combined with phyto exosomes and the omni-antioxidant acetyl zingerone. Clinically shown to brighten skin and visibly improve wrinkles in 7 days with 0% barrier disruption, it is the high-strength vitamin C serum for visible signs of ageing that works smarter, not harsher.

At its core, Medik8 C-Tetra Advanced carries 20% tetrahexyldecyl ascorbate, a highly potent yet gentle form of vitamin C for dramatic brightening and antioxidant protection against premature skin ageing. Phyto exosomes, derived from green tea, deliver proteins, lipids and messenger molecules to skin cells to support more resilient-looking skin, while acetyl zingerone works synergistically with the vitamin C, enhancing its effect as it neutralises ageing free radicals. Hyaluronic acid plumps and hydrates, and N-acetyl glucosamine smooths the look of pores. In Medik8's independent four-week clinical study on 32 participants, skin was visibly brighter and smoother with visibly reduced wrinkles in 7 days and no barrier disruption was measured; in vitro testing showed a 90% reduction in pollution damage to the skin's surface.

Visible Results Users Love

Visibly brighter skin in 7 days
Visibly reduced wrinkles and smoother texture in 7 days
A more even, luminous-looking complexion
A hydrated, primed feel under moisturiser, SPF and make-up
Comfortable skin - 0% barrier disruption measured in the clinical study

Why This Beats a Standard 20% Vitamin C Serum

Strength without the sting - Medik8 C-Tetra Advanced reaches 20% with gentle tetrahexyldecyl ascorbate rather than pure L-ascorbic acid
Phyto exosomes and N-acetyl glucosamine support the skin barrier instead of stressing it
Independent clinical results in 7 days, with barrier disruption measured at zero
A weightless gel-serum texture that absorbs quickly and suits oily and combination skin
Non-comedogenic, dermatologically tested, tested on all skin types and tones, and certified by The Vegan Society

Best For

Visible signs of ageing: fine lines, wrinkles and dullness
Normal, combination and oily skin that prefers a lightweight finish
Uneven tone and dark spots
City skin exposed to pollution and environmental stressors
Anyone who wants a high-strength vitamin C without irritation

Choose Medik8 C-Tetra Advanced if you want the strongest C-Tetra in a weightless gel; if your skin is dry and prefers a nourishing oil, C-Tetra Luxe is the better fit.

After over 20 years in specialist skincare and medical aesthetics, Becci - the aesthetics nurse who founded Adore Your Skin - is wary of any serum that promises strength without consequences. Medik8 C-Tetra Advanced is the exception she recommends: 20% vitamin C with barrier disruption measured at zero is the kind of evidence clients come to her to have explained plainly, and it is her go-to high-strength vitamin C for normal, combination and oily skin.

Size: 30ml

FAQS

Is Medik8 C-Tetra Advanced the best vitamin C serum for brightening? +

Medik8 positions it as its most advanced: 20% stabilised vitamin C, clinically shown to give visibly brighter skin in 7 days with 0% barrier disruption in an independent four-week study on 32 participants. No single serum suits every face, but for brightening on normal, combination or oily skin it is the one Becci reaches for first.

What is the difference between C-Tetra, C-Tetra Luxe and C-Tetra Advanced? +

All three use the same gentle, stabilised vitamin C (tetrahexyldecyl ascorbate); they differ in strength and texture. C-Tetra is the original: 7% in a lightweight oil, for sensitive skin and anyone new to vitamin C. C-Tetra Luxe doubles that to 14% in a rich, nourishing oil with squalane and maracuja oil, for all skin types, first signs of ageing and especially dry skin. C-Tetra Advanced is the newest and strongest of the three at 20%, in a lightweight gel-serum with phyto exosomes, for visible signs of ageing on normal, combination or oily skin. Above them sits Super C Ferulic, 30% ethylated L-ascorbic acid for advanced sun-induced ageing, and the technology also comes as C-Tetra Cream (3%) and Daily Radiance Vitamin C (7% with SPF 30) for anyone who prefers a cream.

Can I use C-Tetra Advanced if I have never used vitamin C before? +

Medik8 says yes. Although it contains a potent 20%, the vitamin C is tetrahexyldecyl ascorbate, a very gentle form suitable for all skin types, and the formula was shown to be gentle on all skin types in independent clinical and consumer testing. Patch test first and start every other morning if you are cautious.

What are phyto exosomes and what do they do? +

Phyto exosomes are tiny plant-derived vesicles - in this formula from green tea - that Medik8 describes as encapsulated by nature. They deliver proteins, lipids and messenger molecules to skin cells, which is how the formula supports the skin barrier and achieved 0% barrier disruption in testing.

Where does C-Tetra Advanced go in my routine? +

Morning, after cleansing and toning but before moisturiser and sunscreen. If you use more than one serum, apply them thinnest to thickest: C-Tetra Advanced is an emulsion, so it goes on top of water-based and oil-based serums such as Liquid Peptides Advanced MP.

Can I use Medik8 C-Tetra Advanced with Crystal Retinal or retinol? +

Yes - Medik8 recommends it as part of its CSA Philosophy: vitamin C plus sunscreen by day, vitamin A by night. Use C-Tetra Advanced in the morning and Crystal Retinal in the evening rather than layering them together.

What did the clinical study on C-Tetra Advanced show? +

In Medik8's independent four-week clinical study on 32 participants: visibly brighter skin, visibly reduced wrinkles and visibly smoother skin texture in 7 days, with 0% barrier disruption. Separate in vitro testing showed a 90% reduction in pollution damage to the skin's surface.

Does C-Tetra Advanced contain fragrance? +

Medik8 states it is free from artificial fragrance; it contains a natural, uplifting citrus scent derived from grapefruit essential oil. If your skin reacts to essential oils, patch test first.

Can I use Medik8 C-Tetra Advanced during pregnancy or while breastfeeding? +

It contains no vitamin A, which is the ingredient most people are asked to avoid. Medik8 does not publish formal pregnancy or breastfeeding guidance: as a cosmetics company it says it cannot advise on medical conditions and asks customers to discuss the full ingredient list with their midwife or GP before use. Its only general note is that the formula contains no ingredients it would recommend avoiding in pregnancy unless your doctor advises otherwise. Please check with your midwife or GP first.