Looking for vitamin C that actually stays potent, penetrates deeply and brightens without the sting or rapid oxidation of pure L-ascorbic acid? Our 10% 3-O-Ethyl Ascorbic Acid treatment tonic delivers exactly that. 3-O-Ethyl Ascorbic Acid (also called Ethyl Ascorbic Acid or 3-O-Ethyl Ascorbate) is one of the most advanced and stable vitamin C derivatives available — combining excellent skin penetration, long shelf-life stability and gentle efficacy in a lightweight, watery tonic format perfect as the first active step after cleansing.
Why 10% 3-O-Ethyl Ascorbic Acid Is a Superior Choice
Unlike traditional ascorbic acid, which degrades quickly in water-based formulas and requires a very low pH, 3-O-Ethyl Ascorbic Acid remains stable at a skin-friendly pH, resists oxidation and converts efficiently to active vitamin C inside the skin. At 10% — a clinically relevant, high-yet-tolerable concentration — it provides powerful visible benefits:

Inhibits tyrosinase to fade hyperpigmentation, dark spots, sun damage, post-acne marks and melasma
Stimulates collagen synthesis to improve firmness, elasticity and the appearance of fine lines
Offers robust antioxidant protection against UV, pollution, blue light and environmental free radicals
Brightens overall complexion for a more luminous, even-toned appearance
Penetrates both oil- and water-loving layers of skin for deeper, more consistent results

Research and formulator data show that 3-O-Ethyl Ascorbic Acid at 5–10% delivers measurable improvements in pigmentation, radiance and skin firmness within 4–8 weeks, often with better tolerance than pure ascorbic acid — making it especially suitable for sensitive, reactive or combination skin types in daily routines.