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.

Full Description 

Defend against premature skin ageing and achieve accelerated skin brightening with a next-generation combination of 20% vitamin C and skin barrier science.

Clinically proven to brighten skin and visibly improve wrinkles in 7 days* with 0% barrier disruption, C-Tetra Advanced is engineered for high-performance visible brightening, skin smoothing, and daily antioxidant defence.

This intelligent ingredient complex combines potent, stabilised 20% vitamin C with restorative phyto exosomes for deep, controlled delivery and omni-antioxidant acetyl zingerone to neutralise the ageing effects of free radicals. 
The result? A high-performance, age-defying vitamin C serum that works smarter, not harsher.

Medik8 C-Tetra Advanced is suitable for all skin types.

Medik8 C-Tetra Advanced is suitable for use during pregnancy or when breastfeeding.

How It Works

Traditional high-strength vitamin C serums can degrade before reaching the skin or cause irritation. C-Tetra Advanced is meticulously formulated with a 20% stabilised vitamin C complex, ensuring long-lasting potency from the first drop to the last. 

Encapsulated by nature and sourced from green tea leaves, phyto exosomes are rich in proteins, lipids, and messenger molecules. Acting as intelligent micro-carriers they carry key signalling molecules, like peptides and nutrients, to send signals to skin cells to help reinforce the skin barrier for optimal skin tolerance and comfort. 

Further fortified by omni-antioxidant acetyl zingerone, the next-generation formula helps shield skin from pollution-induced damage by neutralising free radicals, blocking harmful pollution particles, and strengthening the skin’s natural defences for increased skin resilience.

Medik8 C-Tetra Advanced 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.

Ingredients

Key Ingredients 

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.

We believe in the right product for the right person. We want our product information to be useful to you, so we have done our best to provide you with the most up to date ingredients list.

Please note that from time to time, products are innovated without notice. For the most accurate information please consult the product box. 

If you spot an error, please let us know! We will update this ingredients list as soon as possible.

How To Use It

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

If this product is sealed, please ensure the seal is intact prior to using the product.

Shipping & Returns

All Orders Same Day Dispatch by 2pm M-F (Sydney Business Days) any orders placed after 2pm will leave the following (Sydney Business Day). Please note during big sale periods this can be delayed by a day or two.

FREE for orders $49+ via Australia Post e-Parcel road. Express Post Air add $6.95 via Australia Post

Any orders under $49 will have two options for shipping $4.95 e-Parcel post standard shipping by road via Australia post or $9.95 Express Post express shipping by air via Australia post.

Returns
If it's not right and you haven't opened it yet, you are welcome to Return It within 30 days. Reach out to our team returns@clearskinhouse.com.au for authorisation prior to returning to us in original sealed condition.

Already opened or used the product? We can only accept returns if product is faulty, not if you dislike the product! please reach out to us orders@clearskinhouse.com.au first and we can discuss your options as each brand is different. We can help you understand if a return is possible.

We unfortunately cannot accept returns without return authorisation prior to sending to us.