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
 Retinal Age Defying 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

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

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

Not sure what order to layer your serums? Take our serums layering guide quiz here.

Uses per bottle

80
Guide to Layering
Cleanse
Surface Radiance Cleanse
Morning
Surface Radiance Cleanse
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)
SPF
Morning
()
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
Experts Recommended

C-Tetra Advanced combines the potent power of vitamin C with barrier-supporting phyto exosomes alongside superantioxidant acetyl zingerone, to protect against premature skin aging. C-Tetra Advanced is scientifically proven to shield against the environmental stressors that cause premature skin aging, reducing damage by up to 78%.[3]

DANIEL ISAACS
Chief Product Officer & Founding Partner Of Medik8

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C-Tetra™ Advanced Gel-Serum