New and improved vitamin C serum brightens dullness, visibly improves fine lines and boosts glow in 15 minutes for immediate results-without irritation. Key Ingredients: 15% Vitamin C: Evens tone, visibly firms & defends against aging free-radical damage. Ferulic acid & ergothioneine: Helps fight discoloration & stabilize vitamin C. Ergothioneine: Improves uneven tone & boosts vitamin C's efficacy.