Brand profile

Medik8

11 products available at Celsia Skin — authorised UK retailer.

About Medik8

Medik8 is a British skincare brand founded in 2009 by pharmacologist Elliot Isaacs, built on a simple, science-first promise: professional results without compromise. From its UK laboratories, Medik8 became best known for making vitamin A (retinoids) accessible, effective and easier to tolerate — earning its place in clinics and routines worldwide.

The CSA Philosophy™

Medik8's signature framework is refreshingly simple: C — vitamin C plus sunscreen by day, S — sunscreen every day, A — vitamin A by night. This day/night structure targets the visible signs of ageing from both directions: defending skin from daily environmental stress while supporting overnight renewal.

What Medik8 makes

  • Progressive-strength vitamin A serums and creams
  • Stabilised vitamin C serums for daily radiance
  • Gentle cleansers, exfoliating acids and hydrators
  • Targeted eye care and barrier-supporting moisturisers

Why customers choose Medik8

  • UK-formulated, research-led products with published supporting data
  • Progressive retinoid ladder — start low, build strength as skin adapts
  • Clean, fragrance-conscious formulations suitable for sensitive routines

New to retinoids? Take our free consultation and read our patch test guide before starting — our team will point you to the right strength.

Learn more at medik8.com.

Shop at Celsia Skin: browse the full Medik8 collection, explore Vitamin C and Retinol & Retinoids, read the Patch Test Guide, or book your free consultation.

Medik8

What does the CSA Philosophy mean?

CSA stands for Vitamin C in the morning, Sunscreen every day, and Vitamin A at night — a simple day/night framework Medik8 built its entire range around.

Which Medik8 retinol should I start with?

Medik8's vitamin A ladder is designed to be introduced gradually, starting at a lower strength and building up as skin adapts. We recommend a free consultation or reading our patch test guide before starting.

Can Medik8 vitamin A be used alongside vitamin C?

Yes — the CSA Philosophy is built around using vitamin C by day and vitamin A by night, so the two are designed to complement each other rather than being applied at the same time.

Is Medik8 suitable for sensitive skin?

Medik8 offers gentler entry points into its retinoid ladder and fragrance-conscious formulations, making it a popular choice for building tolerance gradually, though a patch test is always recommended for new actives.

How quickly will I see results with Medik8?

As with most vitamin A regimens, visible improvements in texture and tone are typically seen over consistent weekly use rather than overnight, alongside daily SPF.

Popular from Medik8

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