CSA Routine

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Discover the secret to youthful-looking skin with our clincially proven CSA skincare regime: vitamin C plus sunscreen by day, vitamin A by night. This collection brings together all our vitamin A products, vitamin C favourites and broad-spectrum sunscreens in one place, making it simple to create a personalised CSA routine. Whether you’re new to CSA or looking to refresh your current regimen, you’ll find everything you need to achieve visibly youthful, glowing skin.
Medik8 Daily Radiance Vitamin C glass cream jar is shown open with a generous peak of pale yellow cream on top. Text identifies the product as a 50mL C-Tetra Cream SPF 30 Two-in-One Moisturiser.
"A model with glowing skin smiles next to a list of product benefits on a soft gold background. Text highlights the 2-in-1 Vitamin C Moisturiser with SPF 30: "Prevents signs of premature ageing, Boosts skin radiance, Hydrates the complexion, 100% agree their skin feels protected all day*"
Morning
Dullness
Daily Radiance Vitamin C™ C-Tetra 7% Vitamin C Cream SPF 30 Two-in-One Moisturiser
Full Size (50ml) | £62
Medik8 C-Tetra Advanced bottle displayed on a clean white background with translucent serum droplets, highlighting its lightweight gel-serum texture.
Close-up of a woman with radiant, even-toned skin, with text highlighting how C-Tetra Advanced defends against premature ageing by improving brightness, wrinkles, and skin texture.
Morning
Fine Lines & Wrinkles
C-Tetra® Advanced 20% Vitamin C Gel-Serum With Phyto Exosomes
Full Size (30ml) | £72
Medik8 C-Tetra Luxe serum bottle shown open with its glass pipette resting against the rim, displayed on a white background with clear, translucent serum droplets. The image includes a "GET THE GLOSS BEAUTY AWARDS GOLD 2024" seal in the top left and a "DERMATOLOGIST RECOMMENDED" emblem with a magnifying glass icon in the top right.
Close-up of a smiling woman with glowing skin on a warm orange background. Text reads: ‘Clinically proven to: Healthy glow in just 1 use*. Reduces visible wrinkles and hyperpigmentation in 4 weeks*. Helps to strengthen your skin barrier.’
Morning
Fine Lines & Wrinkles
C-Tetra® Luxe Lipid 14% Vitamin C Enhanced Radiance Serum
Full Size (30ml) | £62
A bottle of Medik8 C-Tetra Lipid Vitamin C Radiance Serum open with its dropper resting diagonally across the top. Set against a clean white background, the bottle is surrounded by three clear puddles of serum, showcasing its liquid texture.
Close-up portrait of a woman with her eyes closed, showcasing a bright and even skin tone. Text highlights that the product "Restores the look of skin radiance in 7 days," delivers a visibly brighter tone, and increases skin youthfulness.
Morning
Dullness
C-Tetra® Lipid 7% Vitamin C Radiance Serum
Full Size (30ml) | £45
Crystal Retinal®
Crystal Retinal®
Evening
Fine Lines & Wrinkles
Crystal Retinal® Award-winning Age-Defying Vitamin A Night Serum
Full Size (30ML) | £45
A white tube of Advanced Day Ultimate Protect stands upright, with a swipe of light cream behind it.
Advanced Day Ultimate Protect™
Morning
Fine Lines & Wrinkles
Advanced Day Ultimate Protect™ Age-Defying Moisturiser with Photolyase SPF 50+ | PA++++
Full Size (50ml) | £59
Medik8 r-Retinoate Intense Youth Activating Cream bottle displayed on a white background with a swatch of the peach-toned cream texture visible behind it.
A person with a streak of cream on their cheek holds a bottle of Medik8 r-Retinoate Intense. Claims include 8x more powerful and 11x faster than classic retinol, with dramatic wrinkle and dark spot reduction in 4 weeks.
Evening
Deep Set Lines & Wrinkles
r-Retinoate® Intense Intense Youth Activating Cream
Full Size (50ml) | £229
A white pump bottle of r-Retinoate Day & Night Eye Serum, with a droplet of product next to it.
A woman's face is shown with a small amount of eye serum applied under one eye. Three bullet points with checkmarks list the benefits: Dramatically fades visible wrinkles around the eyes, For results 8x more powerful than retinol*
Morning
Evening
Fine Lines & Wrinkles
r-Retinoate® Day & Night Eye Serum Youth Activating Eye Serum
Full Size (15ml) | £99
A sleek white pump bottle of r-Retinoate Day & Night stands upright, with a swirl of white cream next to it.
A woman's face is shown with a small amount of white cream on their cheek. Four bullet points with checkmarks list benefits: Visibly brightens, revitalises & smooths the skin; For results 8x more powerful than retinol* – both day & night; Improves uneven skin tone & texture; and a 3-in-1 serum for a simplified regime.
Morning
Evening
Fine Lines & Wrinkles
r-Retinoate® Day & Night Youth Activating Cream
Full Size (50ml) | £149
Liquid Peptides Advanced MP
Liquid Peptides Advanced MP
Morning
Evening
Deep Set Lines & Wrinkles
Liquid Peptides Advanced MP Wrinkle reduction serum with 30% multi-peptide complex - proven to deliver results in as little as 10 minutes.¹
Full Size (30ml) | £82
Medik8 Super C Ferulic serum bottle shown open with its glass pipette resting against the rim, displayed on a clean white background with translucent serum droplets. The amber glass bottle features the Medik8 logo and is labeled "SUPER C FERULIC Potent Vitamin C Brightening Serum" in a 30mL size.
Close-up of a person's face being treated with a glass pipette, set against a light grey background. Text states the product is "CLINICALLY PROVEN ACTION ON 4 SIGNS OF SUN AGEING*" followed by four check-marked claims: Visibly reduces dark spots & age spots*, Improves the look of fine lines & wrinkles in just 4 weeks*, Increases skin firmness & elasticity in 4 weeks*, and Visibly evens the skin tone*. A footer note specifies these results are proven via an independent clinical study.
Morning
Deep Set Lines & Wrinkles
Super C Ferulic™ Potent 30% Vitamin C Brightening Serum
Full Size (30ml) | £69
Medik8 C-Tetra Cream jar displayed open against a clean white background with soft shadows. The white, frosted-glass jar features the Medik8 logo and is labeled "C-TETRA CREAM Lipid Vitamin C Radiance Cream" in a 50mL size. A thick swirl of white cream is visible on top of the jar, highlighting its moisturising texture.
Medik8 C-Tetra Cream jar displayed on a grey stone block against a white background with soft light rays. The image features four check-marked claims: Visibly restores skin radiance, Improves the look of fine lines & uneven skin tone, Nourishes & softens the skin and Helps prevent visible signs of ageing
Morning
Dullness
C-Tetra® Cream Lipid 3% Vitamin C Radiance Cream
Full Size (50ml) | £55
Medik8 Crystal Retinal Ceramide Eye 3 cream tube next to a zigzag swatch of yellow cream on a white background. Two silver badges highlight "WINNER OF 4+ GLOBAL AWARDS" and "WORLD FIRST PATENTED TECHNOLOGY".
A woman's face is shown with small dots of Crystal Retinal Ceramide Eye applied under one eye. Text highlights WORLD'S 1st CLINICAL STRENGTH RETINAL FOR UNDER EYES. Three bullet points with checkmarks list benefits: Visibly brightens, smooths & lifts the eye area, Plumps the eye area overnight, and Reduces the look of puffiness.
Evening
Fine Lines & Wrinkles
Crystal Retinal® Ceramide Eye Smooth & Lift Eye Cream Gentle-Release Vitamin A
Crystal Retinal Ceramide Eye 3 (15ml) | £42
A shot of the Intelligent Retinol Smoothing Night Cream jar, open and showing the cream, on a white background.
Close-up of the Medik8 Intelligent Retinol Smoothing Night Cream, showing the cream's texture inside the jar. The text TWO-IN-ONE RETINOL NIGHT CREAM is at the top, and a list of benefits with checkmarks is on the left: "Visibly smooths & refines uneven skin texture", "Helps to combat the ageing effects of free radicals", "Nourishes & softens the skin", and "Perfect for retinol beginners or a concise PM regime".
Evening
Fine Lines & Wrinkles
Intelligent Retinol® Smoothing Night Cream Renew & Nourish Gentle 0.2% Vitamin A
Full Size | £60
A tube of Medik8 Advanced Day Eye Protect with an SPF 30 rating, and a swatch behind it.
Advanced Day Eye Protect tube lies on a marble surface next to a green fern leaf. Text highlights its SPF 30 protection, prevention of visible ageing signs, and its ability to brighten and depuff the eye area.
Morning
Fine Lines & Wrinkles
Advanced Day Eye Protect™ Age-Defying Eye Cream SPF 30 | 5* UVA
Full Size (15ml) | £42
Medik8 Advanced Day Total Protect tube stands against a clean white background with a large, creamy white moisturiser smear. Text identifies the product as an Age-Defying Moisturiser with SPF 30 and 5* UVA protection in a 50mL size.
A model holding the Medik8 Advanced Day Total Protect tube next to a list of benefits with checkmark icons. Text highlights that it delivers powerful SPF 30 protection against UVA and UVB rays, prevents visible signs of ageing, creates an invisible smoothing base for makeup, and deeply hydrates the complexion.
Morning
Fine Lines & Wrinkles
Advanced Day Total Protect™ Age-Defying Moisturiser SPF 30 | 5* UVA
Full Size (50ml) | £57
Advanced Pro-Collagen+ Peptide Cream Refill
Black backdrop with the Advanced Pro-Collagen+ Peptide Cream jar and text reading: 'Helps to increase collagen production by 45%*.' Benefit claims include firmer skin, reduced wrinkles, and increased elasticity. Asterisk notes this is from an ex vivo study.
Morning
Evening
Fine Lines & Wrinkles
Advanced Pro-Collagen+ Peptide Cream Refill Rejuvenating Anti-Wrinkle Moisturiser With GF MiniProteinTM & NAD+ Longevity Booster
£74

Frequently Asked Questions

What is the Medik8 CSA philosophy?

The Medik8 CSA Philosophy is a clinically proven approach targeting the key signs of skin-ageing: brightening, protecting, and renewing the skin. At its simplest, CSA stands for vitamin C plus sunscreen by day and vitamin A by night, but it’s more than that. Our long-term clinical trial of the CSA regime found that 96% of participants agreed their skin looked younger, while 97% agreed it transformed their skin.

What’s the correct order for vitamin C, retinol and sunscreen?

Follow our simple CSA Philosophy: vitamin C plus sunscreen by day, and vitamin A (retinol/retinal) by night. In the morning, cleanse first, then apply your vitamin C serum to clean skin for maximum absorption. Follow with sunscreen as your daily shield against UV rays and premature ageing. In the evening, start with a gentle cleanse, then apply your vitamin A to help renew and revitalise while you sleep.

Should I use a separate sunscreen or a moisturiser with SPF?

The decision is up to you. A moisturiser with SPF can be convenient; Medik8's formulas are designed to deliver optimal UV coverage, making them a perfect choice to simplify your routine while ensuring comprehensive protection against harmful rays. If you do prefer a combined product, be sure to use enough (more than half a teaspoon for the face and neck - around 3ml) and always opt for a broad-spectrum SPF 30 or higher.

All Medik8 sunscreens are moisturising creams formulated with SPF 30 or above to ensure daily protection against harmful UV rays. We recommend Advanced Day Total Protect, which not only shields against UVA and UVB but also defends against pollution, infrared and blue light, making it the ultimate all-in-one daily moisturiser. If you prefer to use a moisturiser and an SPF, you should ensure your SPF is layered on top of your moisturiser.

Can I use vitamin C and retinol in the same skincare routine?

Absolutely, they’re a powerful duo, but it’s all about timing. At Medik8, we recommend using vitamin C plus sunscreen in the morning, and vitamin A (retinol/retinal) in the evening for optimal results. This way, you maximise results while keeping your skin comfortable. Using both together at night can be done, but it may be too intense for some skin types.

CSA Routine

The CSA philosophy is built on a simple but clinically proven principle: the three most evidence-backed ingredients for visible, age-defying results - vitamin C, sunscreen, and vitamin A. Together, they address 90% of age-related skin concerns* in just three daily steps.

*The '90% of anti-ageing skincare needs' CSA benefit refers to the primary biological and environmental factors of skin ageing - such as UV protection, collagen support, and antioxidant defence. The 10% CSA doesn't cover refers to cleansing and it's benefit of impurity prevention.

Leaders in vitamin C

Vitamin C is notoriously unstable, yet essential for daily antioxidant protection and collagen support. Medik8 only formulates with scientifically proven, stabilised forms of vitamin C to ensure optimal potency from first to last drop, with textures tailored to every skin type.

Sunscreen specialists

Daily broad-spectrum SPF is non-negotiable. Medik8's next-generation sunscreens go beyond UV defence, protecting against pollution, blue light, infrared and glycation-related ageing, all with a lightweight, zero-white-cast finish.

Experts in vitamin A

Vitamin A is the gold standard in age-defying skincare, and Medik8 offers three proven forms across progressive strengths: retinol, retinal and retinyl retinoate. Each is expertly stabilised to maximise visible results without compromise, night after night.