
C-Tetra Advanced take C-Tetra to new heights of age defence and brightening power with Medik8’s powerful 20% vitamin C serum with Phyto Exosomes, designed to prime and prepare your skin for the day ahead. Delivered in a non-greasy, skin-awakening, lightweight gel-serum, C-Tetra Advanced has been enhanced with acetyl zingerone: an innovative omni-antioxidant that accelerates vitamin C’s brightening abilities and phyto exosomes: a rejuvenating plant extract to soothe and support the skin barrier. This combination provides Medik8’s most advanced antioxidant protection yet, for new-found skin resilience.
Key Ingredients:
20% Vitamin C Benefit: Brightens & evens skin tone
TetrahexyldecylAscorbate (a.k.a. THDA or C-Tetra) is a powerful yet stabilised form of vitamin C. At 20%, it quickly works to visibly even skin tone and smooth the appearance of fine lines and wrinkles.
Phyto Exosomes Benefit: Optimal skin support
More powerful than natural plant extracts and already encapsulated for fast delivery, this powerful extract is rich in proteins, lipids, and messenger molecules to help soothe and support the skin barrier. This addition means our powerful 20% Vit C is as gentle as possible.
Acetyl Zingerone Benefit: Omni-antioxidant & vitamin C booster
This innovative antioxidant provides multi-functional defence for maximum daily antioxidant protection against environmental stressors. Whilst also enhancing the benefits of THDA specifically, for accelerated brightening results.
Hyaluronic Acid Benefit: Hydrating & plumping effect
Hyaluronic acid draws moisture into the skin to instantly plump and hydrate, re-awakening skin ready for the day.
2% N-Acetyl-Glucosamine (NAG) Benefit: Barrier-supporting, non-acid exfoliant for smoother skin
A gentle skin-refiner that smooths the look of pores, while increasing the skin’s own natural hyaluronic acid levels over time.
C-TETRA ADVANCED
What is the Innovation?
A Potent Dose of Vitamin C
At 20%, this stable, gentle yet powerful dose of vitamin C delivers clinical brightening results to revitalise dull, uneven skin tone. This gentle form of ascorbic acid works synergistically with omni antioxidant acetyl zingerone to accelerate brightening results, for rapid action.
Omni-antioxidant Acetyl Zingerone
Derived from ginger, this powerful antioxidant is labelled an ‘omni’ antioxidant due to its remarkable ability to defend against multiple types of free radicals, for optimal antioxidant protection. While also acting as a vitamin C booster, it enhances C-Tetra Advanced’s superior skin ageing defence system.
A Medik8 First: Phyto Exosomes
This innovative ingredient is new to Medik8, chosen for its skin rejuvenating properties to boost this awakening serum. This plant-sourced delivery system securely delivers proteins, lipids and messenger molecules, sending signals to enhance skin health. We view exosomes as enhanced plant extracts, showing promising potential in the world of cosmetic science.
A New Take on Pollution Protection
As part of Medik8’s extensive clinical testing, Medik8 has funded studies into the efficacy of this serum against the most impactful types of environmental stressors (e.g. blue light, heavy metal pollution) as well as applying real big city pollution data to gauge just how much C-Tetra Advanced can transform your daily defence.

Introducing Exosomes
“Exosomes” are the latest buzzword in skincare, but what are exosomes and how do they work? Exosomes are natural, protective bubble-like structures (encapsulated) containing a cocktail of active ingredients. This encapsulation ensures that the actives can be delivered into the skin faster and more effectively than regular extracts. Exosomes are packed with small messenger molecules that tell neighbouring cells what to do.
Medik8’s Phyto Exosomes:
Sourced from Green Tea Leaves C-Tetra Advanced contains exosomes which have been extracted from the leaves of green tea (which is why they are called Phyto*-Exosomes). These exosomes were chosen specifically for C-Tetra Advanced due to their hydrating and anti inflammatory properties, which pairs perfectly with high-strength vitamin C. Because of their remarkable ability to deliver replenishing bioactivesinto our skin cells faster and more effectively, our phyto exosomes intelligently enhance skin health, unlocking the true potential of plant bioactives.
Together with our supercharged vitamin C, they help to prevent & reduce premature skin ageing through supporting healthier looking, more resilient skin.
Encapsulated by nature, our phyto exosomes intelligently deliver key proteins, lipids, and messenger molecules into the skin for enhanced skin health and 0% barrier disruption.*
*Phyto- comes from the Greek phytón, meaning “plant.
ASK US ABOUT OUR NEW C-TETRA ADVANCED. CALL 07 38710477.