Skin Brightening Duo a powerful combination designed to illuminate your complexion and promote a more even skin tone. This extraordinary duo includes 5% Niacinamide Facial Serum and our 10% Vitamin C + 1% Acetyl Glucosamine Facial Serum. Experience the transformative power of niacinamide and vitamin C as they work synergistically to even out skin tone fade discoloration and reveal a more youthful glow.