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Experience the gold standard of antioxidant skincare. Powered by 20% stable L-ascorbic acid, this clinical-strength serum helps skin look brighter, firmer, and smoother 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 support the look of firm skin, for the appearance of dark spots and post-inflammatory hyperpigmentation, and to help defend against free radicals.
• 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, gentle base made for fragile skin, including people using Retin-A (tretinoin/retinol).
• Combines Fast-Acting and Long-Lasting Effects
Visibly improves uneven skin tone, enlarged pores, and skin laxity within just 30 days.
Clinical-Strength Vitamin C, Engineered Without the Oxidation
20% L-Ascorbic Acid stabilized in an exclusive zero-oxidation formula — the dermatological gold standard for the look of ageing skin, gentle enough for sensitive skin and people using Retin-A.
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Guides from Dr. Susan Lin, M.D.
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 supports the look of firm skin and an even tone, including skin prone to post-inflammatory hyperpigmentation.
High-Energy Visible (HEV) light from screens generates oxidative stress associated with "digital dullness" and the look of ageing skin. Clinical-grade 20% L-Ascorbic Acid is a potent antioxidant that helps defend against free radicals, including those linked to blue light exposure. That makes it a useful daily step for people who spend long days on screens.
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 limits 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 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.
