Description
The CSA approach (Vitamin C + Sunscreen by day, Vitamin A by night) is recognised as the gold standard for long-term skin health and age prevention. This classic starter routine combines C-Tetra®, Advanced Day Ultimate Protect SPF 50+, and Crystal Retinal® 3 to deliver daily protection, visible radiance and overnight skin renewal in a simple, effective system.
Ideal for those beginning their CSA journey or seeking a streamlined, professional-grade routine with proven results.
What’s Inside the Routine:
C-Tetra® Lipid Vitamin C Serum
A lightweight, lipid-based vitamin C serum that helps brighten the complexion, improve skin tone and support collagen for a naturally radiant appearance. Provides daily antioxidant protection against environmental stressors.
Advanced Day Ultimate Protect™ SPF 50+ | PA++++
A high-performance daily moisturiser offering very high UVA and UVB protection, enhanced with photolyase technology to support skin exposed to environmental aggressors. An essential step for maintaining results and supporting long-term skin health.
Crystal Retinal® 3 (Night Serum)
A medium-strength retinaldehyde serum that supports overnight skin renewal, refines texture and softens the appearance of fine lines. Crystal Retinal works up to 11x faster than traditional retinol*, delivering visible results with a streamlined routine.
*Compared to retinol.
Why This CSA Routine Works:
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Brightens and improves overall skin tone
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Supports collagen and overnight skin renewal
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Helps refine texture and early signs of ageing
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Provides very high daily UV and environmental protection
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Designed for consistent, long-term skin health
Who Is This Routine For?
✔ Normal to combination skin
✔ First-time CSA users
✔ Early to visible signs of ageing
✔ Dull or uneven skin tone
✔ Anyone wanting a simple, effective Medik8 routine
How to Use:
Morning
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Cleanse
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Apply C-Tetra®
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Finish with Advanced Day Ultimate Protect™ SPF 50+
Evening
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Cleanse
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Apply Crystal Retinal® 3 (2–3 nights per week initially, increasing gradually)
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Follow with moisturiser
The Result:
Skin that looks brighter, smoother and more refined — protected by day and renewed by night.
