Palmer's Skin Success Extra Strength Tone Correcting Serum is formulated with a highly efficacious 10% concentration of Niacinamide and powerful youth enhancing ingredients: Amino Acid, Vitamin C, Retinol and Hyaluronic Acid for radiant, younger looking skin.  Visibly improves stubborn dark spots, post acne marks, and wrinkles while it boosts hydration, firmness and radiance.