Medik8 C-TETRA Advanced 20% Vitamin C Gel-Serum 30ml

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Potent antioxidant protection for visibly brighter, firmer, and more radiant skin.

Elevate your morning skincare routine with Medik8 C-Tetra Advanced, a high-strength yet gentle 20% Vitamin C gel-serum designed to fight free radicals, smooth fine lines, and restore your skin’s natural glow. This powerful, fast-absorbing formula is ideal for those seeking advanced brightening and anti-ageing benefits without irritation.

KEY BENEFITS

Brightens dull skin and evens out skin tone with high-strength stabilised Vitamin C
Boosts collagen production, helping to reduce the appearance of fine lines and wrinkles
Neutralises free radicals, preventing premature skin ageing from pollution and UV
Hydrates and nourishes with a lightweight, non-greasy gel texture
Suitable for all skin types, including sensitive skin thanks to its non-irritating formula

KEY INGREDIENTS

20% Tetrahexyldecyl Ascorbate – A highly stable, oil-soluble form of Vitamin C that deeply penetrates the skin to boost brightness and collagen
Vitamin E (Tocopherol) – Works synergistically with Vitamin C for enhanced antioxidant defence
Squalane – Provides lightweight hydration and helps to restore the skin barrier
Jojoba Oil – Conditions and softens skin without clogging pores

HOW TO USE

AM only. After cleansing, apply 4–6 drops directly to the face, neck, and décolletage. Massage in, then follow with SPF every day.

Works Well With

Medik8 Hydr8 B5 Serum – for extra hydration and plumping
Medik8 Advanced Day Ultimate Protect SPF 50+ – to lock in Vitamin C benefits and shield against UV damage
Medik8 Crystal Retinal (PM) – alternate in your evening routine for a full-spectrum anti-ageing approach

How to Layer Medik8 Press & Glow in Your Routine:

AM Routine Example:

Cleanser - Daily Radiance Cleanser
Tone - Press & Glow
After C-Tetra Advanced Serum, apply Advanced Day Ultimate Protect SPF50

Tip: Follow with Vitamin A as part of your evening routine for maximum age-defying results. Try our best-selling Vitamin A Night Serum, Crystal Retinal.

Why This Works:

Cleanse: surface Radiance Cleanse
Tone: Press & Glow Daily Toner
Apply C-Tetra Advance Serum
Advanced Day Ultimate Protect SPF

Good to Know

Medik8 Products do not contain Artificial Fragrance & Synthetic Colours. They are Paraben & Alcohol Free, and Certified by the Vegan Society.

Stocked by Authorised Medik8 Stockist – Beautythings UK
Beautythings UK is an official Medik8 retailer, ensuring you receive 100% genuine, high-performance skincare. Curated by skincare specialist Jess Southall, our collection is handpicked to offer expert-approved skincare solutions.

About Me
I’m Jess, a skincare expert with over 30 years in the beauty industry and founder of BeautyThings UK. I’m passionate about making top-quality, results-driven skincare accessible to everyone. I carefully select brands I trust—like Medik8—because I know they deliver visible, lasting results without unnecessary fuss.

About a Good Skincare Routine

Skincare doesn’t need to be complicated—but it should be consistent. A strong routine balances:

Cleansing, opting for a double cleanse and using a Super Soft Microfibre Face Cloth
Targeted treatments like acids or serums. Am and Pm will differ, Vitamin C in the morning & Retinols at night.
Hydration. Choose a moisturiser to suit your skin for day time or nighttime.
Protection (always SPF!)
Products like Medik8 Sleep Glycolic are powerful tools that slot into a good nightime skincare system to renew, resurface, and reveal your best skin over time.

More Information
Skin Concern	Signs of skin Ageing, Fine Lines & Wrinkles
Product Category	Serums & Boosters, Toners

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 *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.

Orders Over £50

FREE - Tracked Royal Mail Second Class Orders Over £50
 £2.95 - Tracked Royal Mail First Class 
£5.95 - Royal Mail Next Day (Order before 2 pm Mon-Thur) 
£8.95 - Royal Mail Saturday Delivery (Order before 2 pm Mon-Fri)

Orders Under £50

£3.95 - Tracked Royal Mail Second Class 
£4.95 - Tracked Royal Mail First Class
£8.95 - Royal Mail Next Day (Order before 2 pm Mon-Thur) 
£10.95 - Royal Mail Saturday Delivery (Order before 2 pm Mon-Fri)

Delivery Upgrades can be added at checkout

• Next Day Delivery does not include Saturdays
• Excludes Bank Holidays/Royal Mail Strike Days

EUROPE - This Service is Temporarily Suspended 

When Will your order be posted? Most orders are posted out the same day if you order before 2 pm. Your order may be posted out the next day if the order is late in the day or there is a low stock level. As we receive new stock on a daily basis then there is no need to notify you. If for some reason the item you have ordered is going to be out of stock for some time, you will be notified of this and given the option to wait or cancel your order. Next Day Delivery orders must be placed by 2 pm.