Details & care What it is: A highly potent, fast-absorbing serum infused with 15% THD ascorbate (vitamin C) to fight the look of dullness, dark spots and discolorations.Who it's for: All skin types. What it does: It instantly increases brightness, radiance and luminosity while fighting the look of dark spots and discolorations at the source. Skin looks firmer and plumper, and your youthful bounce and even skin tone are restored. The gold-standard form of vitamin C, THD ascorbate is both highly stable and oil-soluble, helping it to rapidly absorb into the skin for enhanced tone, clarity and visible brightening. This hydrating formula instantly polishes, protects and illuminates the skin while phytosterols help to reduce the look of redness and skin sensitivity.