- Why THDA vs. L-ascorbic acid? THD ascorbate is a stable form of vitamin C that is converted to pure vitamin C by enzymes in the skin. THDA is known for its ability to penetrate deeply into the skin, and is less irritating than L-ascorbic acid.
- Why multi-ingredients vs. only vitamin C? Marula oil enhances skin penetration and provides additional antioxidants (like Vitamin E and oleic acid), which amplify THDA’s efficacy by supporting collagen production, reducing inflammation, and locking in moisture.
- Why not 100% THDA? Dr. Koo believes in skin minimalism. THDA is highly effective with even lower 2% - 5% concentrations leading to visible results. The 13% THDA formulation is scientifically balanced to deliver optimal results without overloading the skin.
Detailed ingredients list:
Cyclopentasiloxane, Dimethicone, Sclerocarya Birrea Seed Oil, PCA Dimethicone, Tetrahexyldecyl Ascorbate, Ceramide NP, Tocopherol, Phytonadione, Dimethiconol, Jojoba Esters, Caprylic/Capric Triglyceride, Cholecalciferol, Phenyl Trimethicone, Lecithin, Zea Mays (Corn) Oil, and Trimethylsiloxysilicate