Medik8 C-Tetra Lipid Vitamin C Radiance Serum – 7% Stabilised Vitamin C for Brighter, Smoother Skin
Gentle Power. Visible Glow. Vitamin C That Works—Even for Sensitive Skin
Looking for an effective way to start your vitamin C journey without compromising your skin’s comfort? The Medik8 C-Tetra Lipid Vitamin C Radiance Serum offers a gentle yet high-performance solution for visibly brighter, healthier, and smoother-looking skin. Powered by a stabilised form of vitamin C (tetrahexyldecyl ascorbate) and enriched with nourishing vitamin E, this serum is a cult-favorite for good reason: it restores radiance, evens tone, softens fine lines, and does it all without irritation.
Designed for daily morning use, it’s a cornerstone of Medik8’s renowned CSA Philosophy—Vitamin C in the morning, Sunscreen by day, and Vitamin A at night.
What Is Medik8 C-Tetra Lipid Vitamin C Radiance Serum?
C-Tetra is a lightweight lipid-based serum that delivers 7% vitamin C directly into the skin to visibly boost luminosity, reduce signs of aging, and protect against free radical damage. With a silky, non-greasy texture based in jojoba seed oil, it absorbs quickly, delivering deep nourishment while leaving the skin feeling soft and comforted.
Clinically proven and dermatologist-recommended, C-Tetra is the perfect vitamin C serum for sensitive skin or those who are new to active skincare.
Who Should Use It?
This serum is ideal for:
- Sensitive skin types or first-time vitamin C users
- Skin with dullness, uneven tone, or early signs of aging
- Anyone seeking a low-irritation, daily antioxidant
- Those who want to gently integrate the CSA philosophy into their routine
If your skin is reactive, easily sensitized, or prone to redness, C-Tetra is an ideal entry-level solution that offers powerful results with minimal risk of irritation.
Key Benefits of Medik8 C-Tetra Lipid Vitamin C Radiance Serum
Brightens Skin Tone: Thanks to its 7% concentration of tetrahexyldecyl ascorbate, C-Tetra helps:
- Diminish dullness
- Promote a radiant glow
- Reduce the appearance of dark spots and uneven pigmentation
Smooths Fine Lines: Vitamin C works alongside vitamin E to soften the look of fine lines and wrinkles by boosting collagen synthesis, leading to a more youthful and refined complexion.
Protects Against Free Radical Damage: This formula neutralizes oxidative stress caused by environmental aggressors such as UV radiation and pollution—key culprits behind premature aging.
Gentle, Nourishing Formula: With a base of jojoba oil and no artificial fragrances or synthetic colors, the serum is both nourishing and well-tolerated, even on sensitive or reactive skin.
Key Ingredients of Medik8 C-Tetra Lipid Vitamin C Radiance Serum
7% Tetrahexyldecyl Ascorbate
A lipid-soluble, stabilised form of vitamin C that:
- Penetrates deeply without causing irritation
- Supports collagen production
- Brightens and evens the skin tone
- Resists degradation from light, heat, and air (long-lasting potency)
Vitamin E (Tocopheryl Acetate)
This antioxidant boosts the power of vitamin C and offers additional protection against environmental aggressors, while helping to calm and soothe the skin.
Jojoba Seed Oil
Mimics the skin’s natural oils to:
- Deliver hydration without clogging pores
- Support skin barrier function
- Leave a silky, smooth, non-greasy finish
How to Use Medik8 C-Tetra
Step-by-step application:
- Cleanse: Start with a gentle cleanse, such as Medik8 Surface Radiance Cleanse.
- Apply Serum: Massage 4 drops of C-Tetra into the face, neck, and décolletage in the morning.
- Let It Absorb: Allow a few moments for full absorption.
- Protect: Follow with a sunscreen like Medik8 Advanced Day Ultimate Protect SPF 50+ for optimal results.
Pro Tip: Using a vitamin C serum daily in the morning not only boosts your skin’s glow but also enhances the effectiveness of your SPF in fighting environmental stress.
Visible Results Backed by Clinical Evidence
- 96% of users with sensitive skin reported the serum was gentle
- 7 days to visibly brighter and smoother skin*
- 90% agreed skin felt instantly softer
- 4 weeks to visibly reduced wrinkles and dark spots
*Based on an independent consumer study on 52 participants with sensitive skin.
Suggested Routine for Maximum Radiance
Morning (CSA Step 1 + 2):
- Cleanser: Medik8 Micellar Mousse™
- Vitamin C: Medik8 C-Tetra Lipid Vitamin C Radiance Serum
- Moisturiser & SPF: Medik8 Advanced Day Ultimate Protect™
Night (CSA Step 3):
- Cleanser: Medik8 Surface Radiance Cleanse™
- Vitamin A: Medik8 Crystal Retinal® (choose strength based on skin tolerance)
Pairing C-Tetra with retinal at night and broad-spectrum SPF by day creates a powerful age-defying routine that aligns with Medik8’s acclaimed CSA Philosophy.
Why Choose Medik8 C-Tetra?
- Dermatologist-formulated for sensitive skin
- Scientifically backed results with visible improvement in 7 days
- Third-party verified sustainability claims
- Certified by the Vegan Society
- No parabens, artificial fragrance, or synthetic colors
Have Questions? Lyskin’s Experts Are Here for You
If you’re unsure how to start a vitamin C routine or how to integrate C-Tetra into your current regimen, don’t hesitate to use the Q&A tab to connect with our dermocosmetic experts. We offer personalized guidance to ensure your skincare journey is smooth, safe, and successful.
Conclusion: A Radiant Start for Every Skin
Medik8 C-Tetra Lipid Vitamin C Radiance Serum is the perfect first step into professional-grade vitamin C skincare. With high tolerability, proven effectiveness, and a silky finish, it delivers transformative results without compromising comfort. If you’re seeking a brighter, more youthful complexion with visible results in just 7 days, this serum is your glow-getting essential.
Glow safely. Start smart. Choose C-Tetra.





















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