Everything You Need To Know About The
C-Tetra Family

Hailed for its many age-defying benefits, vitamin C is a must-have in any daily skincare routine. This powerhouse antioxidant is renowned for its abilities to boost the skin’s natural radiance, brighten the appearance of hyperpigmentation and dark spots, support collagen production, and protect against the ageing effects of environmental aggressors.

So what makes a Medik8 vitamin C serum different?

As the Leaders in Vitamin C, our advanced vitamin C serums deliver unmatched stability which ensures optimal potency and, therefore, maximum visible results until the very last drop. Our bestselling C-Tetra® range is expertly formulated with tetrahexyldecyl ascorbate; a stabilised form of vitamin C that’s proven to be effective yet non-irritating - even on sensitive skins.[1] Not only this, but our expertly-curated C-Tetra range boasts beautifully silky textures that melt effortlessly into the skin for a luxurious sensorial experience. Visibly smoother, glowing and evenly-toned skin is just a few drops away…

What are the core differences between C-Tetra and C-Tetra Luxe?

C-Tetra® Lipid Vitamin C Radiance Serum

C-Tetra is Medik8’s original, cult-favourite vitamin C serum. The bestselling formula features stabilised vitamin C to deliver effective visible brightening results while remaining gentle. This makes it the ideal radiance-boosting solution for sensitive skins or those who are new to vitamin C. In fact, 96% of sensitive skins agree that C-Tetra is gentle on the skin.[2] C-Tetra is also lightweight in texture, so is also a great option for those with oily skin concerns who don’t want to compromise on visible results.


Stabilised Vitamin C
Formulated with stabilised and lipid-soluble tetrahexyldecyl ascorbate, C-Tetra ensures gentle yet effective power for visible smoothing, brightening yet non-irritating results - even on sensitive skin types. The preserved potency of the formula, thanks to its stabilisation, means that C-Tetra also works to visibly reduce the appearance of fine lines, wrinkles and dark spots in as little as 4 weeks.[2]

Radiance & Antioxidant Protection
With a powerful combination of vitamin C and vitamin E, C-Tetra provides exceptional daily protection against the harmful and ageing effects of external stressors such as free radicals. Vitamin C also works to visibly enhance the skin’s natural glow and radiance while brightening the look of hyperpigmentation, dark marks and uneven skin tone.

Vitamin C Beginners
Because of its gentle action, C-Tetra is the perfect option for those who are new to vitamin C - as well as those with sensitive skin. Its proven low-irritation formula is the ideal introduction to vitamin C usage, without compromising on visible results.

Lightweight Texture
C-Tetra’s silky yet lightweight texture also makes it a great choice for anyone with congested or oily skin concerns. The jojoba oil-based formula delivers essential nourishment, without being too heavy.

Proven Results[2]
-Restores the look of skin radiance and a healthy-looking glow in 7 days
-Visibly brightens and smooths the skin in 7 days
-Softens the appearance of fine lines and wrinkles
-Reduces the look of dark spots
-Gentle and non-irritating
-94% of sensitive skins agree C-Tetra is suitable for their skin type from first use

C-Tetra® Luxe Lipid Vitamin C Enhanced Radiance Serum

C-Tetra Luxe is our supercharged, results-driven and high concentration vitamin C serum which balances clinical brightening power with a gentle, nourishing experience for the skin. This luxurious serum is designed for those looking for next-level youth-renewing results alongside an exquisite sensorial experience that truly elevates the daily skincare routine. This ultimate, all-round vitamin C formula is clinically proven to restore the look of skin radiance, boost brightness, smooth wrinkles, reduce hyperpigmentation and support the natural skin barrier.[3]


Double The Vitamin C Power
C-Tetra Luxe is formulated with twice the amount of stabilised tetrahexyldecyl ascorbate than the original C-Tetra serum. Still gentle on the skin, C-Tetra Luxe also delivers enhanced visible brightening, smoothing and antioxidant power for clinically-proven results.

The Luxe Vitamin C Experience
C-Tetra Luxe offers results-driven power without the irritation that often accompanies high-concentration vitamin C formulas. With an uplifting citrus aroma derived from natural extracts, the nourishing serum also ensures an unforgettable skincare experience.

Fortified Formula
This velvety serum is fortified with squalane and maracuja oil to further boost the nourishing and antioxidant properties of vitamin C. This allows C-Tetra Luxe to deliver intense softness and comfort while strengthening the skin barrier and providing powerful protection against the damaging, drying and ageing effects of external stressors.

Recharged Radiance
The visible brightening benefits of vitamin C are further bolstered within C-Tetra Luxe thanks to fermented red ginseng extract. A core ingredient in traditional Chinese medicine and widely recognised for its multiple skin-friendly benefits, red ginseng works to boost the visible brightening and collagen-supporting properties of vitamin C for enhanced results.

Clinically-Proven Results[3]
- Restores the look of skin radiance in 7 days
- Visibly brightens the complexion in 7 days
- Reduces the appearance of wrinkles and hyperpigmentation in 4 weeks
- Strengthens the skin barrier
- Visibly refines the skin texture and evens skin tone in 4 weeks
- Gentle and non-irritating

Why might I want to use C-Tetra Luxe over the original C-Tetra serum?

We recommend our original, bestselling C-Tetra serum to those who are new to vitamin C, as well as those who have sensitive or oily skin concerns. This is due to its gentle power and lightweight texture. 

C-Tetra Luxe is the pinnacle of our C-Tetra range. Containing twice the amount of vitamin C than C-Tetra, it delivers supercharged results. Fortified with antioxidants, we recommend C-Tetra Luxe as the perfect all-round vitamin C for enhanced visible brightening, nourishing and age-defying results. Despite its high concentration of vitamin C, C-Tetra Luxe isproven to be gentle and non-irritating. 

How do I use C-Tetra or C-Tetra Luxe?

After cleansing in the morning, and following water-based serums and direct acids/toners, massage 6 drops of C-Tetra / C-Tetra Luxe across the face, neck and décolletage.

Both C-Tetra and C-Tetra Luxe are ideal for your daytime routine in conjunction with sunscreen, followed by a vitamin A serum in the evening. This aligns with our globally-renowned CSA Philosophy which champions optimal skin health and maximum visible results through using vitamin C plus sunscreen by day, and vitamin A by night. 

[1] Proven via independent consumer study conducted on C-Tetra over 4 weeks on 52 participants with sensitive skin & via independent clinical study on C-Tetra Luxe conducted over 4 weeks on 36 participants
[2] Proven via independent consumer study conducted on C-Tetra over 4 weeks on 52 participants with sensitive skin
[3] Proven via independent clinical study on C-Tetra Luxe conducted over 4 weeks on 36 participants