A deeper look at the power of 20% Tetrahexyldecyl Ascorbate
Vitamin C is one of the most researched, beloved, and effective ingredients in skincare — but not all forms of Vitamin C are created equal.
And if you’ve ever used a Vitamin C serum that oxidized, irritated your skin, or simply didn’t deliver the results you expected, you already know this firsthand.
That’s exactly why we created C Radiance Complex, our newest advanced Vitamin C serum formulated with a highly stable, lipid-soluble, and exceptionally well-absorbed form of Vitamin C: Tetrahexyldecyl Ascorbate (THD Ascorbate) at a clinically effective 20% concentration.
This isn’t just another Vitamin C serum.
It’s Vitamin C, elevated.
Why THD Ascorbate? The Science Behind This Superior Form of Vitamin C
Most traditional Vitamin C serums use L-ascorbic acid — a powerful ingredient, but one that’s notoriously unstable. It oxidizes quickly, can lose effectiveness over time, and often irritates sensitive skin.
THD Ascorbate is different.
Here’s why it stands out:
1. It’s lipid-soluble — which means deeper absorption
THD Ascorbate can actually pass through the lipid layer of the skin, reaching deeper into the dermis where collagen is formed.
Most forms of Vitamin C stay on the surface; THD Ascorbate goes further, supporting meaningful change at a deeper level.
2. It’s up to 50x more stable than L-ascorbic acid
This means the Vitamin C in your bottle stays potent longer — without the orange tint or rapid oxidation common in other Vitamin C serums.
3. It’s gentle, even at high concentrations
Despite its strength, its lipid-soluble nature makes it well tolerated — ideal for sensitive skin types or anyone who couldn’t previously use Vitamin C without irritation.
4. It delivers visible brightening + long-term collagen support
Because it can penetrate deeper, THD Ascorbate excels at:
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Reducing dark spots and hyperpigmentation
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Supporting firmer-looking skin
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Smoothing fine lines and wrinkles
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Boosting overall radiance
This is Vitamin C that truly performs — both immediately and over time.
Why 20% THD Ascorbate Makes a Difference
Research shows that 20% is the optimal concentration for delivering powerful antioxidant protection and visible brightening benefits without overwhelming the skin.
At this level, THD Ascorbate can:
✔ Reduce visible hyperpigmentation
THD Ascorbate interferes with excess melanin production, helping fade dark spots, sun spots, and uneven tone.
✔ Stimulate collagen and elastin
This supports smoother, firmer, more youthful-looking skin over time.
✔ Improve overall radiance
The complexion appears brighter, clearer, and more even.
✔ Provide robust antioxidant protection
At 20%, THD Ascorbate helps neutralize the oxidative stress that accelerates visible aging — a key reason why Vitamin C is foundational in daily skincare.
This concentration hits the perfect balance: powerful, effective, and still beautifully gentle.
Beyond Vitamin C: The Supporting Cast That Makes C Radiance Complex Shine
A great formula doesn’t stop at one hero ingredient.
C Radiance Complex was intentionally designed with synergistic antioxidants and botanicals that amplify both performance and tolerability.
Vitamin E
Enhances stability, boosts antioxidant power, and works in tandem with Vitamin C for maximized defense against environmental stressors.
Botanical Complex with a natural firming effect
Helps soften the appearance of fine lines, especially crepey skin texture, for both immediate smoothing and long-term wrinkle reduction.
Rice Bran Extract
Hydrates, nourishes, and supports a naturally more even complexion.
Sunflower Extract
Improves moisture retention and provides additional antioxidant benefits.
Barrier-strengthening botanicals
Soothe the skin and support a healthy, resilient skin barrier — ideal for sensitive or easily irritated skin types.
The result?
A formula that’s potent, stable, deeply nourishing, and universally well-tolerated.
What You Can Expect From Daily Use
With consistent use, C Radiance Complex helps:
✨ Brighten and even out skin tone
✨ Reduce the appearance of dark spots and hyperpigmentation
✨ Smooth fine lines and improve skin texture
✨ Boost collagen and support firmer-looking skin
✨ Defend against environmental damage
✨ Improve hydration and overall radiance
It’s everything you want from Vitamin C — and more.
How to Use C Radiance Complex
For best results:
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Apply 1–2 drops per area of face and neck, to clean, dry skin each morning.
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Follow with moisturizer and SPF (always SPF!).
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Can also be used in the evening if desired, as its stability makes it compatible with most skincare routines.
Suitable for:
✔ All skin types
✔ Sensitive skin
✔ Aging skin
✔ Those targeting hyperpigmentation
A New Era of Vitamin C at Kate Ryan Skincare
We created C Radiance Complex because you deserve skincare that is both effective and safe — formulas grounded in research, thoughtfully designed, and created with long-term skin health in mind.
If you’ve struggled to find a Vitamin C serum that truly performs, we think you’ll feel the difference from the very first use.
Meet your new daily radiance ritual.
Your skin is going to love this one.
