MENTHOL Menthol is an invigorating ingredient known to provide an instant refreshing feeling to skin. CAFFEINE Caffeine is an alkaloid known for its stimulating properties. In our formulas, it helps energize and reduce dullness. VITAMIN C Vitamin Cg, or Ascorbyl Glucoside, is a Vitamin C derivative. With antioxidant benefits, this form of Vitamin C is known to help boost radiance and smooth skin texture. See full list