Medik8 Skincare
Discover our curated selection of Medik8 — science-led skincare built around simple, effective routines. Whether you’re starting a vitamin A journey, upgrading your vitamin C, or looking for peptide-powered hydration, you can shop our best-loved Medik8 products online with UK delivery available.
The CSA approach (simple routine, big results)
The CSA approach (simple routine, big results)
Medik8’s well-known “CSA” philosophy is built around vitamin C + sunscreen by day and vitamin A (retinol/retinal) by night
Shop Medik8 by routine
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Vitamin A at night (Crystal Retinal): build results gradually with the right strength for your skin.
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Vitamin C by day: brighten the look of dullness and support antioxidant protection.
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Peptides & barrier support: for hydration, comfort and a smoother-looking complexion.
Crystal Retinal strength guide
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Medik8 Crystal Retinal is a vitamin A night serum range designed to be used gradually. If you’re new to vitamin A, starting at a lower strength and building up slowly helps your skin adjust more comfortably.
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As a simple guide: start low if you’re new, move to a mid strength if you already use retinol/retinal, and only choose higher strengths if you’re very experienced and your skin tolerates vitamin A well.
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New to vitamin A / sensitive skin: Crystal Retinal 1–3
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Some experience with retinol/retinal: Crystal Retinal 6–10
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Very experienced users: Crystal Retinal 20–24
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Use at night on dry skin, then moisturise. Start 2–3 nights per week, then increase frequency as tolerated. Always wear SPF daily. If your skin feels dry or irritated, reduce frequency and focus on moisturising. Avoid vitamin A products during pregnancy or breastfeeding unless advised by a clinician.