Medik8 C-Tetra Advanced

A high-strength, skin-brightening vitamin C serum that visibly improves skin tone, texture and fine lines in just 7 days*.

With 20% stabilised vitamin C and phyto exosomes, this fast-absorbing formula defends against environmental damage—without disrupting your skin barrier. Ideal for dull, uneven or ageing skin.

Important: This is not a beginner formula. It’s best suited to those who’ve already built up Vitamin C tolerance. Not sure where to begin? C-Tetra is our go-to for Vitamin C newcomers — gentle, effective, and skin-confidence-building.

Tetra Advanced delivers a potent 20% stabilised vitamin C complex, clinically shown to brighten skin and visibly smooth wrinkles in as little as 7 days.* This high-strength antioxidant targets dullness, uneven skin tone, and fine lines while staying gentle on your skin. 

Phyto exosomes enhance delivery of active ingredients deep into skin cells, helping to reduce and prevent early signs of ageing while supporting a healthier, more resilient complexion. 

Acetyl zingerone, a powerful all-round antioxidant, further defends against free radical damage. 

The result: visible transformation with zero disruption to your skin barrier.

Key Benefits: 

Dramatic Skin Brightening: Clinically proven to visibly brighten skin and even tone in 7 days for a radiant, luminous complexion.

Enhanced Skin Barrier Support: Powerful phyto exosomes deliver replenishing bioactives to skin cells rapidly & effectively, ensuring 0% barrier disruption.

Premature Skin Ageing Defence: Shields skin from damaging free radicals, pollution, and daily environmental stressors to help defend against premature skin ageing.

Smooth & Even Complexion: Clinically proven to visibly improve skin smoothness and texture in 7 days, leaving a soft, polished finish.

Lightweight Finish: The fast-absorbing gel-serum texture hydrates, smooths, and primes leaving skin instantly refreshed and ready for the day ahead.

20% Stabilised Vitamin C (Tetrahexyldecyl Ascorbate): A highly potent yet gentle form of vitamin C for dramatic skin brightening and powerful antioxidant protection against premature skin ageing

Phyto Exosomes: Encapsulated by nature, our phyto exosomes intelligently deliver proteins, lipids, and messenger molecules to skin cells. Together, alongside our supercharged vitamin C, they help prevent & reduce premature skin ageing by supporting healthier-looking, more resilient skin.

Acetyl Zingerone (pronounced ‘a-sea-tul’): A super-antioxidant that works synergistically with vitamin C, enhancing its efficacy while neutralising ageing free radicals and shielding skin from environmental stressors.

Multi-Weight Hyaluronic Acid: Draws moisture into the skin to instantly plump and deeply hydrate for a soft, supple complexion.

N-Acetyl Glucosamine (NAG): A barrier-supporting, gentle, skin-refiner that smooths the look of pores, while helping to increase the skin’s own natural hyaluronic acid levels over time.

Aqua (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.

FREE for orders $49+ via Australia Post e-Parcel ground.

Express Air add $5.95.

Same Day Dispatch by 4pm M-F (Sydney Business Days)

Returns

If something isn’t quite right, you can lodge a return through our Returns Portal.

Our team will review your request and guide you through the next steps.

Please note: Change of mind returns are only accepted for products that are unopened, unused, and in their original sealed packaging

All returns must be lodged through the portal and approved prior to sending any items back