Medik8 C-Tetra Serum 30ml
You'll earn 39 Status Points with this product
£39.00
Or 4 interest free payments of £9.75 with clearpay
In stock | Usually dispatched within 24 hours

Making skin care simple, Medik8 takes the fuss out of caring for your complexion. Powered by three key ingredients: vitamin C, vitamin A and non-negotiable SPF, the brand's signature skin care saviours are famed for their potent potions. Discover the C-Tetra Serum (30ml), the brand's introductory vitamin C treatment that delivers a brighter, more even complexion.
Are you looking for the perfect entry point to vitamin C? Cue the C-Tetra Serum (30ml) from Medik8.
Formulated with tetrahexyldecyl ascorbate (AKA stabilised vitamin C) at a 7% potency, this stabilised vitamin C serum (which is suitable for sensitive skin) works to brighten uneven skin tone while reducing the appearance of dark spots, fine lines and wrinkles. Infused with antioxidant-rich vitamin E, it protects against free radical damage while nourishing jojoba seed oil delivers a super soft, comforting feel. The result? A healthy-looking complexion in no time.
Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.
For the latest information, it is recommended to review the ingredient list printed on the packaging of the product prior to usage or consumption.
After cleansing in the morning, massage four drops across the face, neck and décolletage. Leave to absorb before applying sunscreen.
Transparency lies at the heart of our philosophy which is why we have partnered with tech-platform – Provenance – to cut through the industry ‘noise’ and equip you with key facts that matter. A 'proof point' with a green tick means a third party has verified the accuracy of the statement whereas no green tick means that there isn't independent confirmation (yet!), but that the brand has still supplied substantiating evidence (which you can view yourself). Discover the proof points for this product below.
Frequently Bought Together

This item
Medik8 C-Tetra Serum 30ml
£39.00
Other Customers Bought
Customer Reviews
5 stars rating 325 reviews
4 stars rating 73 reviews
3 stars rating 24 reviews
2 stars rating 6 reviews
1 stars rating 3 reviews
Top Customer Reviews
Thanks for sharing your thoughts! Please remember that results will vary from person to person. We're proud to say that all customer reviews are independent, authentic and do not represent the views of Cult Beauty or The Hut Group.
Gentle but effective
This is the first vitamin C that hasn’t broken my skin out. It’s so gentle and makes your skin like glass
by Emma Verified Purchase
Was this helpful?
Amazing serum
Decided to give this a go after reading reviews and the price point in comparison to similar serums, and so glad I did. Has made such a difference to my skin after just a few weeks of use - so much clearer and smoother. Will definitely be a repeat buy for me.
by Clare Verified Purchase
Was this helpful?
Lightweight
Lightweight, comfortable and visibly improves skin! Great on its own or under makeup.
by Jen Verified Purchase
Was this helpful?
Over 8 pore clogging ingredients!
I was really looking forward to using this due to the reviews, however after using it I started to suffer breakouts when I am usually blemish free, I checked the ingredients and it has over 8 pore clogging ingredients, so if you cannot use pore blocking products then please avoid this. Thankfully I discontinued use and my skin improved again, disappointed due to how much it cost and it ends up actually causing you more issues.
by Nicole Verified Purchase
Was this helpful?
Slightly oily serum
I haven’t broken out using this serum yet but it’s oilier than I thought oils prefer
by L Verified Purchase
Was this helpful?
Skincare staple
This is my favourite Vit C serum! Lightweight, soaks in well and doesn’t break me out like others I have tried. Also leaves skin with a gorgeous glow and smells lovely!
by Ellie Verified Purchase
Was this helpful?
Great
I wasn't sure what to expect, but this serum really brightens and refreshes my 40-something skin. I will buy again!
by Apw Verified Purchase
Was this helpful?
MEDIK8 C-TETRA SERUM
Leaves skin feeling very hydrated but I haven’t seen any improvement on skin texture, fine lines and my pores seem emphasised after using this.
by Nicki Verified Purchase
Was this helpful?
A repurchase
Am really enjoying my first bottle so have re bought. I have tried a few vitamin c serums and this is my favourite so far. I’m sure there are better out there but I’m tired of searching so sticking with this!
by Hannah Verified Purchase
Was this helpful?
Sunshine in a bottle
This serum makes my skin glow like nothing else out there. I use once a day after cleansing in the morning and after a week or two, I see the difference. It’s now a staple part of my skincare routine.
by Sarah Verified Purchase
Was this helpful?