Named by Vogue as one of the best naturally derived vitamin C sources for brightening, the Dr.Althea Vitamin C Boosting Serum earns its place as a firm fixture in your daily routine. At its helm sits 63% hippophae rhamnoides (sea buckthorn) water: a rich, naturally vitamin‑C–rich extract known to support the look of collagen production, improve moisture and nourish the skin barrier. Working alongside it, tranexamic acid and niacinamide target uneven tone, revealing a brighter, more unified glow. Packed with antioxidants, the serum visibly protects as it illuminates.