THD-Ascorbate Vitamin C Serum bottle by Dr. Koo — stable lipid-soluble formula stays clear and active
Anti-Oxidant Vitamin C Serum — clinical-strength THD-Ascorbate for collagen support, tone brightening, and firmness
Vitamin C serum comparison chart — Dr. Koo THD-Ascorbate vs SkinCeuticals, La Mer, Dr. Barbara Sturm, Augustinus Bader
Before and after clinical results — 12-week THD-Ascorbate study showing 97% fine line improvement, 94% elasticity, 94% radiance
5-star customer review for Dr. Koo Anti-Oxidant Vitamin Serum — soft, plump, hydrated, glowing skin after 3 weeks
Dr. Koo Anti-Oxidant Vitamin Serum bottle with vitamin cofactor capsules — essential co-factors for skin metabolism
Dr. Koo Powerhouse Barrier Vitamin Complex infographic — Vitamins C, D, E, F, K for skin barrier defense and recovery
Barrier-boosting hydration ingredients — ceramides, jojoba oil, and marula oil for lipid barrier support in Dr. Koo Vitamin Serum
Dr. Koo AM and PM skincare routine — morning protect-hydrate-nourish and night cleanse-transform-replenish regimen
Skin Barrier 101 — how Anti-Oxidant Vitamin Serum with ceramides and fatty acids repairs and protects the skin barrier
Damaged vs healthy skin barrier diagram — how strong barrier function creates smooth, hydrated, firm skin
Silky soothing fast-absorbing Anti-Oxidant Vitamin Serum — no parabens, phthalates, fragrance, dyes, gluten, or eco-toxins, safe for all skin types
Dr. Koo Anti-Oxidant Vitamin Serum — future-proof your skin with antioxidant defense, collagen support, brightening, and UV pollution protection
Surgeon-formulated THD-Ascorbate at therapeutic concentration

Anti-Oxidant Vitamin Serum

Sale price$200.00
- THD-Ascorbate — a lipid-soluble Vitamin C that penetrates the stratum corneum to reach the dermis, where collagen is actually built
- Therapeutic dose, not a marketing dose — every active at the concentration where clinical studies show measurable tissue response
- Supports collagen triple-helix formation — the structural protein that determines skin firmness, elasticity, and wrinkle depth
- Multi-vitamin complex (C, D, E, F, K) with ceramides and marula oil — lipid-soluble delivery vehicles that reinforce the skin barrier
- 97% improvement in fine lines | 94% radiance | 91% firmness — independent 12-week clinical study, 33 patients ages 40-65
Original size: 30ml

I formulated this serum because I operate on skin every day — I've seen under magnification what years of sun damage and oxidative stress do to collagen architecture. THD-Ascorbate is the only form of Vitamin C that crosses the stratum corneum and activates at the fibroblast level, where collagen is actually synthesized. That's not marketing — that's the mechanism that matters.

From Dr. Michele Koo, board‑certified plastic surgeon
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