Brand New Kate Somerville Kx Active Concentrates. Vitamin B3 + Vitamin C Serum. 1 Fl Oz Full Size This lightweight clinical serum visibly improves tone, texture and clarity as it brightens skin. Vitamins B + C work together to target discoloration and unevenness, improving radiance and luminosity. A high-performance serum clinically formulated to powerfully brighten & improve skin. With just two drops twice a day, you’ll visibly improve skin tone, texture and clarity, brighten skin, improve the appearance of discoloration and even skin tone. AM and PM. Apply 1-2 drops on cleansed skin. Let fully absorb before using additional products. 📦 All Beauty and Skincare in my closet have been purchased directly from chain distributor.