MD Ultimate 20% Vitamin C Serum for face featuring pure L-Ascorbic Acid in a professional-grade clinical bottle for anti-aging and dark spot reduction.

A woman applying MD Ultimate Vitamin C Serum to her face to treat fine lines and hyperpigmentation while providing digital blue light protection.

Close-up of MD Ultimate Vitamin C Serum showing a crystal-clear, non-oxidized dropper to demonstrate formula stability and weightless water-based texture.

MD Ultimate Vitamin C Serum in a laboratory science setting highlighting the 20% USP-grade purity and ionic delivery system for professional skin results

Home
products
MD® Vitamin C Serum

MD® SKIN

MD® Vitamin C Serum

¥19,800

Size: 30ml

30ml

Quantity

Why MD® Vitamin C Serum

20% USP-grade L-Ascorbic Acid Physician-Formulated Water-Based High-Flux Matrix Fragrance-Free Blue Light Defense Stabilized Made in USA Crystal Clear No Heavy Oils

MD® Ultimate Vitamin C: The 20% L-Ascorbic Clinical Standard

Redefine skin longevity with the purest form of Vitamin C. Unlike prestige formulas that rely on diluted derivatives and heavy oils, MD® delivers a peak 20% concentration of USP-grade L-Ascorbic Acid in a high-flux, water-based matrix. This physician-formulated serum provides instant antioxidant saturation to dismantle dark spots, neutralize digital blue light stress, and rebuild the appearance of collagen-dense skin. Crystal clear, fragrance-free, and meticulously stabilized — the professional's choice for a high-definition, ageless glow.

How to apply MD® Vitamin C Serum

Cleanse face and gently pat dry.
Apply 3–4 drops to face, neck, and décolleté in the morning.
Press into skin; allow 60 seconds to absorb fully.
Layer with moisturizer, then sunscreen (MD® Ultimate Anti-Aging Mineral Sunblock SPF 50 recommended).
Use daily for sustained antioxidant defense and brightening.

The MD® Skin clinical signature: 20% L-Ascorbic Acid at USP-grade purity, stabilized in a water-based matrix engineered for maximum bioavailability. Physician-developed by Dr. Susan Lin, M.D.

→ Full skin clinical evidence dossier

We create beauty through advanced science™

Complete Your Routine

MD® Ultimate Anti-Aging Mineral Sunblock SPF 50

¥8,300

MD Skin

MD® Ultimate Eye Cream

¥18,100

MD Skin

MD® Stem Cell Factor 55

¥26,300

MD Skin

‹ swipe ›

Curated by Dr. Susan Lin, M.D. for the complete MD® ritual.

MD® Vitamin C Serum

¥19,800

To understand the power of MD Vitamin C, it is essential to recognize the visible impact of 20% L-Ascorbic Acid on the skin's structure.

Phase 0: The Signs of Environmental Stress

Before treatment, the skin often reflects the cumulative damage of UV exposure, urban pollution, and digital blue light.

Dullness & Discoloration: Skin appears lackluster and "tired." Cumulative oxidative stress manifests as visible sun spots, age spots, and uneven pigmentation.
Texture & Laxity: As the dermal matrix loses its structural integrity, pores appear enlarged and "stretched." Fine lines become prominent due to collagen depletion and chronic dehydration.

Phase 1: The Glow of Restored Health

After consistent use of our clinical-grade protocol, the skin transitions into a state of active recovery and defense.

Radiance & Clarity: A unified, luminous skin tone emerges. The high-potency formula targets localized melanin clusters, shattering hyperpigmentation and restoring a high-definition clarity.
Firmness & Refinement: Structural resilience is restored. Pores appear tighter, and the skin’s surface feels smoother and firmer. The refined texture evenly reflects light, creating a naturally vibrant, ageless glow.

Why the 30-Day Window Matters

Because the skin’s natural turnover cycle takes approximately 28 days, using the 20% L-Ascorbic Acid consistently for one month allows the "new" skin cells to emerge fully saturated with antioxidants. This ensures that the results you see aren't just surface-level—they reflect improved skin health from the inside out.

1 / 2

Experience the gold standard of anti-aging. Powered by 20% stable L-ascorbic acid, this clinical-strength serum brightens, firms, and smooths skin in just 30 days. Unlike other serums, our formula stays clear, never oxidizes, and is gentle enough for sensitive or Retin-A treated skin.

• 20% Gold-Standard Concentration, Clinically Potent
Utilizes the dermatological “gold standard” of 20% L-ascorbic acid to powerfully stimulate collagen regeneration, fade dark spots and acne marks, and defend against free-radical damage.

• Exclusive “Zero-Oxidation” Stabilization Technology
Unlike vitamin C products that easily turn yellow and lose potency, MD® employs an ultra-stable formula. Even after one year of opening, every drop remains clear and fully active.

• A Boon for Sensitive Skin and Retin-A Users
Features a pH-balanced, non-irritating base, making it safe for fragile skin undergoing Retin-A (tretinoin/retinol) treatment. Enjoy true renewal without redness.

• Combines Fast-Acting and Long-Lasting Effects
Visibly improves uneven skin tone, enlarged pores, and skin laxity within just 30 days.

Key Ingredients: The MD® Clinical Matrix

Powered by Science, Perfected by Nature
Our formula combines the highest concentration of clinical-grade actives with potent botanical stabilizers to deliver results without compromise.

Learn More

· 20% L-Ascorbic Acid — The purest form of Vitamin C, a potent antioxidant that strengthens skin’s natural defense and visibly reverses photoaging.

· Amla Fruit Extract — A natural super-antioxidant that works synergistically with Vitamin C to enhance anti-inflammatory and brightening effects.

· Ergothioneine — A rare mushroom-derived antioxidant that delivers deep cellular protection and helps delay visible signs of aging.

✨ Result: Skin appears firmer, brighter, and more resilient with a youthful, healthy glow.

User Proven Results

Real Stories, Remarkable Results

This serum gives you the radiant glow you've always dreamed of, without any stinging sensation! It's a true savior for sensitive skin. Pores visibly shrink, and makeup applies more smoothly. With consistent use, your skin will achieve:
• Brighter: Fades dark spots, improves uneven skin tone and dullness.
• Firmer: Smooths fine lines and wrinkles, boosts skin elasticity.
• Smoother: Minimizes enlarged pores, refines skin texture.
• Stronger: Protects against UV damage and free radicals, builds a stronger skin barrier.

Scientific skin rejuvenation, fearless of time

MD® Vitamin C is an advanced bio-active treatment, not a traditional cosmetic serum. Physician-formulated to bridge the gap between clinical procedures and daily topicals, this formula targets the three pillars of skin aging: oxidative dullness, recalcitrant hyperpigmentation, and dermal sagging."1. 20% L-Ascorbic Acid (USP-Grade)The highest clinical concentration of pure Vitamin C available. At 20%, the skin reaches its maximum absorption threshold (saturation point). This USP-grade active initiates immediate collagen signaling and neutralizes the free radicals responsible for structural aging and "digital fatigue" from blue light.2. High-Flux Ionic Water-BaseBy utilizing a purified, oil-free water matrix, we ensure a "High-Flux" delivery. This carrier allows the L-Ascorbic Acid to remain in its most potent, acidic state ($pH \approx 2.7$), driving the active ingredients directly into the dermis without the sticky residue or "metallic" scent found in stabilized oil serums.3. Precision Stability SystemOur medical-grade stabilization process ensures that the serum remains crystal clear and bio-available for up to 12 months. This ensures that every drop delivered to your skin is at peak potency, never oxidized, and never yellow.

• Resists Oxidation and Yellowing: Breakthrough stabilization technology ensures the serum remains clear and transparent, maintaining potency even one year after opening.

• 20% Gold Standard Concentration: Utilizes 20% L-ascorbic acid, the clinically proven optimal concentration for effectively stimulating collagen regeneration and fading dark spots.

• Zero Irritation for Sensitive Skin: Unique pH-balanced formula, safe for use even on dry, sensitive skin or skin undergoing acid/AHA or retinol treatments.

How to Use

Maximize results with a precise application protocol.

Professional Protocol: How to Use

1. PREP: Begin with a thoroughly cleansed and slightly damp face. For maximum bio-availability, ensure no residue from oil-based cleansers remains.

2. DISPENSE: Place 3–5 drops into the palm or onto fingertips. The water-based matrix has high molecular mobility, so a small amount is sufficient to cover the entire treatment area.

3. ACTIVATE: Press the serum into the face, neck, and the backs of hands using firm, upward motions. Avoid the immediate eye area. The "Press & Roll" technique ensures the 20% L-Ascorbic Acid reaches the deeper dermal layers.

4. THE ASCORBIC GAP: Allow 10 minutes for the serum to fully penetrate and for the skin’s pH to calibrate. This "activation window" ensures the 20% concentration is locked into the skin’s reservoir before it is sealed by subsequent products.

5. SEAL: Follow with a broad-spectrum SPF in the morning or a lipid-rich moisturizer in the evening.

Tip: A brief tingling sensation is a clinical sign of the 20% L-Ascorbic Acid optimizing your skin’s pH environment. This typically subsides within 3–5 days as your skin’s resilience increases. A slight tingling sensation may occur during initial use.

· 20% L-Ascorbic Acid — The purest form of Vitamin C, a potent antioxidant that strengthens skin’s natural defense and visibly reverses photoaging.

· Amla Fruit Extract — A natural super-antioxidant that works synergistically with Vitamin C to enhance anti-inflammatory and brightening effects.

· Ergothioneine — A rare mushroom-derived antioxidant that delivers deep cellular protection and helps delay visible signs of aging.

✨ Result: Skin appears firmer, brighter, and more resilient with a youthful, healthy glow.

MD Ultimate Tinted Mineral Sunblock SPF 50 tube provides medical-grade broad-spectrum UVA/UVB protection and a non-greasy matte finish.

Woman on a sunny beach using a non-greasy beach SPF. This sweat-resistant mineral shield for sensitive skin provides broad-spectrum UVA/UVB protection without a white cast.

LEARN MORE

MD® Ultimate Anti-Aging Mineral Sunblock SPF 50

¥8,300

MD Ultimate Eye Cream jar for under-eye puffiness, dark circles, and anti-aging support from the MD Skin collection

LEARN MORE

MD® Ultimate Eye Cream

¥18,100

MD Ultimate White Serum – skin-brightening treatment with glutathione and peptides to reduce dark spots and promote radiant, even skin tone

LEARN MORE

MD® Ultimate White

¥26,300

MD White Factor 1600mg glutathione supplement bottle for skin brightening and antioxidant support

Clinical ingredient breakdown of reduced L-glutathione, vitamin C, and alpha lipoic acid

LEARN MORE

MD® White Factor

¥9,900

Customer Proven:

Real Results from MD Lash,MD Hair,MD Wellness

Frequently Asked Questions

Because MD® Vitamin C s a pure water-based formula without irritating Ferulic Acid or synthetic fragrances, it is an excellent post-procedure antioxidant. Once the skin barrier has closed (typically 48–72 hours post-treatment), applying our 20% L-Ascorbic Acid helps provide the essential building blocks for collagen synthesis and prevents post-inflammatory hyperpigmentation.

High-Energy Visible (HEV) light from screens generates oxidative stress that leads to "digital dullness" and collagen breakdown. Clinical-grade 20% L-Ascorbic Acid acts as a molecular shield, neutralizing the specific free radicals triggered by blue light exposure. This makes it an essential daily treatment for professionals in high-tech environments.

To ensure maximum bioavailability. L-Ascorbic Acid requires a specific acidic pH (approx. 2.7) to penetrate the skin barrier. Applying a moisturizer (which usually has a neutral pH) too quickly can "buffer" or neutralize the Vitamin C before it reaches the dermis. The 10-minute "Ascorbic Gap" allows the serum to fully saturate the skin's reservoir for 72-hour protection.

While 20% is the maximum clinical strength for Vitamin C, MD® Ultimate is formulated with a high-flux water-base rather than heavy oils, which reduces the "trapped" heat sensation often associated with irritation. While a slight tingling is a normal sign of Active Saturation, our formula is designed to deliver high-potency anti-aging results with a focus on skin-barrier compatibility.

Clarity is the ultimate indicator of antioxidant stability. Many Vitamin C serums use Ferulic Acid or synthetic dyes to mask oxidation (turning orange or brown). MD® Ultimate is meticulously stabilized through a physician-formulated ionic matrix, ensuring the 20% L-Ascorbic Acid remains crystal clear and 100% bio-active for up to 12 months. If a serum is yellow, it has already begun to lose its potency.

LEARN MORE

MD® SKIN