Koo Me In FAQs

In over 26 years as a board-certified plastic surgeon, I have operated on thousands of faces. I have seen collagen architecture under surgical magnification. I understand, at the tissue level, what creates skin that looks genuinely luminous — and what causes it to lose that quality.

That perspective is what separates this line from everything else on the market. The cornerstone active is THD-Ascorbate (Tetrahexyldecyl Ascorbate) — a lipid-soluble form of Vitamin C that crosses the stratum corneum and is activated intracellularly by esterases at the fibroblast level. Conventional water-soluble Vitamin C cannot efficiently cross this barrier. Most serums never reach the cell where collagen is actually synthesized.

Every formulation is engineered within a narrow pH corridor so the entire regimen works as a single intracellular system — each product preparing the skin to receive the next. No fragrance. No unnecessary fillers. No marketing doses. Only what the science requires, at the concentration the tissue responds to.

Your skin deserves precision, not guesswork. Dr. Koo’s Skin Consultation is a 2-minute guided assessment that matches you with exact products, concentration levels, and a personalized AM/PM protocol based on your concern, age, skin type, and tolerance history.

If you prefer a single starting point: the Anti-Oxidant Vitamin Serum containing 15% THD-Ascorbate is the foundation of every Dr. Koo regimen. It addresses oxidative stress, melanin regulation, and collagen cofactor delivery in one formulation — making it the single most transformative product regardless of your primary concern. Pair it with your age-appropriate pH-Optimum Retinol and a skin-type-matched hydration serum for a complete introductory protocol.

For personalized guidance directly from Dr. Koo’s office: drkoo@drkooskincare.com

This is the question that changes how you think about Vitamin C forever.

THD-Ascorbate (Tetrahexyldecyl Ascorbate) is lipid-soluble and pH-neutral. Unlike conventional water-soluble Vitamin C — which oxidizes rapidly, irritates at the concentrations needed to be effective, and largely sits on the skin’s surface — THD-Ascorbate dissolves through the lipid-rich stratum corneum and is activated inside the cell by esterases.

Why this matters: collagen synthesis happens at the fibroblast level, deep in the dermis. The enzyme prolyl hydroxylase requires ascorbate as a cofactor to hydroxylate proline residues in procollagen — the essential step for stable collagen triple-helix formation. If the Vitamin C never reaches the fibroblast, it cannot participate in collagen production. The percentage on the label becomes irrelevant.

Dr. Koo’s formulation contains 15% THD-Ascorbate at therapeutic concentration — dosed where independent clinical studies demonstrate measurable tissue response: 97% improvement in fine lines, 94% radiance, 91% firmness in a 12-week study of 33 patients (ages 40–65) with consistent twice-daily use.

This is not a marketing dose. This is the dose the tissue responds to.

For why this matters at the cellular level — how THD-Ascorbate reaches the fibroblast where conventional water-soluble Vitamin C cannot — see the full clinical Q&A →

Your skin’s capacity for renewal evolves. Dr. Koo’s system is designed with progressive concentration levels — each building on the cellular resilience established by the one before.

Retinol ranges from Level 1 (1,000 IU — the elegant starting point for new retinol users) through Level 4 (8,000 IU — for deep collagen remodeling and firmness restoration). Your Skin Consultation assigns the precise starting level. After 8 weeks of consistent use, you advance — each step up accelerates collagen gene expression and refines texture with the precision your skin has earned.

Pigment Refiner follows the same architecture: Level 1 for mild pigmentation and maintenance, Level 3 for significant sun damage or melasma.

This graduated approach prevents tachyphylaxis — the tolerance that occurs when skin is exposed to the same active concentration indefinitely. You use only what you need, when you need it, preserving the higher levels for when your skin is ready. Think of it as a prescription refined for each stage of your skin’s transformation.

Medical-grade skincare is formulated under pharmaceutical-level oversight — Good Manufacturing Practices (GMP), physician-directed active selection, and concentrations validated by clinical evidence.

The distinction is not branding. It is measurable. Cosmetic skincare prioritizes sensory appeal: fragrance, texture, packaging. Active concentrations often meet the bare minimum for a label claim. Medical-grade skincare prioritizes therapeutic efficacy: actives dosed where clinical studies show measurable tissue response, delivery systems engineered to cross the skin barrier, and every unnecessary ingredient eliminated.

Dr. Koo’s proprietary delivery systems — buffering, microsomes, and microparticle technology — ensure actives reach their intracellular targets without the irritation that typically accompanies clinical-strength concentrations. This is why patients preparing for surgery trust this regimen. The products you receive are the same formulations used in Dr. Koo’s plastic surgery practice.

Dermatologists diagnose. They identify conditions — eczema, rosacea, acne, skin cancers — and treat them with medications, light therapy, and topicals. Their mastery is in classification and management.

Plastic surgeons operate. We analyze tissue under magnification, reposition collagen architecture, and reconstruct what time and environment have changed. We see the dermal matrix that determines whether skin looks luminous or fatigued — because we work within that matrix surgically, every day.

That surgical intimacy with tissue architecture shaped every formulation in this line. The promise is specific: consistent use delivers results visible enough to reduce or delay your need for Botox, fillers, and laser treatments. These products are designed to achieve what I see in my surgical patients — genuine structural improvement at the collagen level, not surface-level cosmetic enhancement.

Skin transformation follows a biological timeline. The right regimen optimizes every stage.

Immediately: You will feel the difference — elegant absorption, no residue, no heaviness. The formulations are engineered for sensory precision.

2 weeks: Visible luminosity and sheen as THD-Ascorbate neutralizes oxidative damage and the hydration serum restores ceramide architecture.

6 weeks: Pore refinement, texture improvement, and early pigment correction as retinol-driven cell turnover accelerates the emergence of fresh, organized cell layers.

3–6 months: Measurable improvement in firmness, smoothness, and collagen density. This is the timeframe validated by clinical studies — and why Dr. Koo offers the 120-Day Guarantee. Your skin deserves biological time. You deserve zero financial risk while the science does its work.

For what to expect at month 3, month 6, and year 2, see the full clinical Q&A →

By design — not by compromise. Dr. Koo’s pH-Optimum Retinol is buffered with Marula Oil, Grapeseed Oil, Bisabolol (a chamomile-derived anti-irritant), and Ginger Root Extract. This buffering architecture delivers therapeutic retinol potency while protecting the barrier integrity that conventional retinol disrupts.

Level 1 (1,000 IU) is gentle enough for first-time retinol users — and formulated to be dabbed into the delicate periorbital area. The graduated Levels 1 through 4 mean you begin where your skin is comfortable and advance only when it signals readiness.

For reactive or barrier-compromised skin, Dr. Koo’s protocol begins with 4 weeks of dedicated barrier repair — hydration and gentle cleansing, no actives — before introducing anything your skin needs to tolerate. Take the Skin Consultation and select “Sensitivity or redness” for a phased protocol built specifically for your skin.

Pigmentation darkens when melanin production exceeds the skin’s natural clearing capacity. Effective correction requires addressing both sides simultaneously: inhibiting new melanin formation while accelerating the turnover of already-pigmented cells.

Dr. Koo’s protocol activates two pathways at once. The Active Pigment Refiner inhibits tyrosinase — the enzyme directly responsible for melanin synthesis — using alpha-arbutin, niacinamide, and liposomal caffeine. Not hydroquinone. Dr. Koo considers hydroquinone too toxic for the long-term maintenance that conditions like melasma require. The Anti-Oxidant Vitamin Serum (THD-Ascorbate) brightens through a separate intracellular pathway, interrupting melanin oxidation where it forms.

Level 1 for mild or post-inflammatory pigmentation. Level 3 for significant sun damage or melasma. Your Skin Consultation assigns the correct level. Broad-spectrum SPF 30+ is non-negotiable — UV exposure will undo the repair faster than any active can build it.

For why melasma responds to protocol discipline rather than a single product — including which adjunct correctives the regimen requires — see the full clinical Q&A →

Every Dr. Koo formulation is built on active ingredients at therapeutic concentration — not the minimum for a label claim.

THD-Ascorbate (15%) — Lipid-soluble Vitamin C. Crosses the stratum corneum. Activated intracellularly. Delivers the cofactor for collagen triple-helix formation. Present in the Anti-Oxidant Vitamin Serum and Eye Serum.

pH-Optimum Retinol (1,000–8,000 IU) — Buffered with Marula Oil and Bisabolol for tolerability without potency compromise. Upregulates collagen gene expression. Suppresses MMP enzymes. Four progressive levels.

Alpha-Arbutin + Niacinamide — Tyrosinase inhibition for pigment correction without hydroquinone toxicity. Present in Active Pigment Refiner Levels 1 and 3.

Five Ceramides (NP, EOP, EOS, NS, AP) — Comprehensive barrier repair. Present in the Replenishing Eye Serum and hydration formulations.

Phytonadione (Vitamin K) — Stabilizes fragile vasculature. Reduces dark circle appearance and ruddiness. Present in both the Eye Serum and Vitamin Serum for complementary coverage.

All products are fragrance-free, manufactured under GMP standards in the United States, and formulated within a narrow pH range for intracellular synergy.

Every product is formulated by Dr. Michele Koo, MD, FACS and a curated team of pharmaceutical chemists. All manufacturing takes place in the United States under Good Manufacturing Practices (GMP) — the same standards applied to pharmaceutical production.

These formulations have been refined over decades of use with Dr. Koo’s own plastic surgery patients — whose skin she monitors before and after surgical procedures. The most rigorous testing environment any skincare regimen can undergo. What you receive is exactly what these patients trust.

Orders ship within 3–5 business days. A shipping confirmation with tracking arrives the moment your order leaves our facility.

All major credit cards, PayPal, and Apple Pay. Your card is authorized upon order placement and charged when your order ships.

Yes. Email info@drkooskincare.com or call +1 (314) 984-8331. Only unshipped orders may be cancelled.

Yes, to select countries. Contact info@drkooskincare.com for availability and rates to your location.

Complimentary standard shipping on every order. Overnight shipping available upon request — contact info@drkooskincare.com for overnight rates.

Start with the Skin Consultation — a 2-minute guided assessment with Dr. Koo’s specific protocol recommendations. For more in-depth guidance, complete our consultation form or email drkoo@drkooskincare.com directly.

Dr. Koo offers a 120-Day Satisfaction Guarantee. Skin transformation follows a biological timeline — your barrier needs time to rebuild, retinol needs time to upregulate collagen gene expression, and pigment correction requires multiple cell turnover cycles. You deserve zero financial risk while the science does its work.

If after 120 days of consistent use you are not seeing improvement, contact info@drkooskincare.com. Most often, a minor refinement to product selection or concentration level is all that’s needed. Dr. Koo’s team is always available to adjust your regimen.

Returns: 333 S. Kirkwood Rd., Suite 203, St. Louis, MO 63122.