C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
C-Tetra™ Advanced Gel-Serum
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C-Tetra™ Advanced Gel-Serum

  • Brighten
  • |
  • Even
  • |
  • Protect
20% Vitamin C + Phyto Exosomes for age-defying brightness

Defend against the visible effects of premature skin aging and achieve accelerated skin brightening with a next-generation combination of 20% Vitamin C and Phyto Exosomes.

Delivered in a non-greasy, lightweight gel-serum, this intelligent ingredient complex combines potent, stabilized, Vitamin C with restorative Phyto Exosomes for visible brightening, skin smoothing, and daily antioxidant defense.

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Crystal Retinal
Crystal Retinal
  • Renew
  • |
  • Firm
  • |
  • Smooth
 Award-winning Age-Defying Vitamin A Night Serum
Select a 1 TUBE (1.0 FL. OZ.)
Key Benefits
Dramatic Skin Brightening

Clinically proven to visibly brighten skin for a radiant, luminous complexion

Smooth & Even Complexion

Improves skin smoothness and texture leaving a soft, polished finish

Premature Skin Aging Defense

Helps shield the skin from daily environmental stressors & defends against the visible effects of premature skin aging

Primed & Refreshed

Hydrates, smooths, and primes leaving skin instantly refreshed

Proven Results
BEFORE
AFTER
BEFORE
AFTER
77% increase in the visible skin brightening[1]
1 week to skin looking more youthful with visibly improved wrinkles[2]
1 week to visibly smoother skin texture[3]
[1] Proven via independent clinical study conducted over 4 weeks on 32 participants.
[2]Proven via independent clinical and consumer studies conducted over 4 weeks on 144 participants.
[3]Proven via independent clinical study conducted over 4 weeks on 31 participants.
How to Use

First-Time Use

If you're new to C-Tetra Advanced we recommend a patch test at least 24 hours before first use. Learn how to patch test here.

How To Use

Apply as part of your morning skincare routine. Massage 2-3 pumps across the face, neck and décolletage. Follow with moisturiser and always finish with sunscreen.

Uses per bottle

80
Guide to Layering
Cleanse
Surface Radiance Cleansing Gel
Morning
Surface Radiance Cleansing Gel
Full Size (5.0 FL. OZ. (150 mL))
Tone
Press & Clear
Morning
Press & Clear
Select a Size
Brighten
C-Tetra™ Advanced Gel-Serum
Morning
C-Tetra™ Advanced Gel-Serum
(0)
Key Ingredients
20% Stabilized Vitamin C (Tetrahexyldecyl Ascorbate)

A highly potent and gentle form of Vitamin C for skin brightening & protection against premature skin aging.

Phyto Exosomes

Encapsulated by nature, it helps to deliver proteins, lipids, and messenger molecules to skin cells to help soothe & support the skin barrier.

Acetyl Zingerone

A super-antioxidant that enhances the benefits of Vitamin C, while providing the ultimate defense & protection against environmental stressors.  

Multi-Weight Hyaluronic Acid

Instantly plumps and deeply hydrates for a soft, supple complexion.

Acetyl Zingerone

A super-antioxidant that enhances the benefits of Vitamin C, while providing the ultimate defense & protection against environmental stressors.  

Multi-Weight Hyaluronic Acid

Instantly plumps and deeply hydrates for a soft, supple complexion.

N-Acetyl Glucosamine (NAG)

Smooths the look of pores, while helping to increase the skin’s own natural hyaluronic acid levels over time.

Full List of Ingredients
C-Tetra™ Advanced Gel-Serum
20% Vitamin C + Phyto Exosomes for age-defying brightness

Water, Tetrahexyldecyl Ascorbate, Isododecane, Propanediol, Acetyl Glucosamine, Squalane, Tocopherol, Acetyl Zingerone, Camellia Sinensis (Green Tea) Leaf Vesicles, Hydroxyacetophenone, Sodium Hyaluronate, Cellulose, Avena Sativa (Oat) Kernel Extract, Glycerin, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Citrus Grandis (Grapefruit) Peel Oil, Sucrose Stearate, Tetrasodium Glutamate Diacetate, Ethylhexylglycerin, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Sodium Benzoate, Cellulose Gum, 1,2-Hexanediol, Polysorbate 60, Sorbitan Isostearate, Citric Acid, Phenoxyethanol, Citral, Linalool, Limonene

*Although we try our best to ensure this list of ingredients is accurate there may be product upgrades from time to time, or slight variants between different regions based on local laws, meaning the only definitive ingredient list is that which is printed on the product packaging.
  • Certified by the vegan society
  • Artificial fragrance free
  • Dermatologically tested
  • Non-comedogenic

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Reviews

Frequently Asked Questions

Does C-Tetra™ Advanced Gel-Serum contain fragrance/essential oils?
C-Tetra™ Advanced Gel-Serum is free from artificial fragrances but does contain a natural, uplifting citrus fragrance derived from essential oils. The scent is refreshing and is designed to enhance your experience and offer an energizing start to your morning skincare regimen. If you are familiar with our C-Tetra™ and C-Tetra™ Luxe serums, you can expect to smell the same scent.
Can I use C-Tetra™ Advanced Gel-Serum if I’ve never used vitamin C before?
Absolutely. Although C-Tetra™ Advanced Gel-Serum contains a potent 20% vitamin C, it has been formulated using a very gentle form of vitamin C called THDA (Tetrahexyldecyl Ascorbate) that is suitable for all skin types, even if you’re new to vitamin C. Alongside this, it contains many gentle actives such as Phyto Exosomes, which offer soothing properties to support the skin barrier. C-Tetra™ Advanced Gel-Serum is also proven to be gentle on all skin types in independent clinical and consumer testing. This means anyone can enjoy C-Tetra™ Advanced Gel-Serum without fear of irritation.
Where do I layer C-Tetra™ Advanced Gel-Serum in my regimen?
C-Tetra™ Advanced Gel-Serum should be applied in the morning, after cleansing and toning, but before moisturizer and sunscreen. If you are using multiple serums, we recommend applying them in order of thinnest to thickest in texture. Since C-Tetra™ Advanced Gel-Serum is an emulsion, it should be layered on top of water and oil-based serums. We recommend layering Exo-PDRN Prismatic+ first then following with C-Tetra Advanced. This ensures your skin gets the full benefits of each product.
Can I use C-Tetra™ Advanced Gel-Serum alongside Crystal Retinal (vitamin A)?
Absolutely. We recommend it as part of our pioneering CSA Philosophy(TM) which champions vitamin C plus sunscreen by day, and vitamin A by night as the simple secret to glowing, youthful-looking skin.
Can I use C-Tetra™ Advanced Gel-Serum if I am pregnant or breastfeeding?
As a cosmetics company, we are unable to provide product advice for medical conditions such as pregnancy or breastfeeding. We strongly recommend discussing the ingredients with your physician before use. As general guidance, this product does not contain any ingredients which we would recommend avoiding during pregnancy unless advised by your physician.
C-Tetra™ Advanced Gel-Serum