The C’s the Day Serum brightens skin in minutes! This serum has 40 times the vitamin C than in an orange, licorice root extract, niacinamide (Vit D3) which improves dullness and tones skin. The serum also has ginseng and mushrooms to calm and nourish skin. C’s the Day Serum also helps with hyperpigmentation which is a huge plus! You only apply 2-3 drops at night before your moisturizer, so it lasts quite a while! I love this product!!!