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Our best-selling 15% vitamin C brightens skin, improves the appearance of fine lines & wrinkles & boosts glow in 15 minutes for immediate results–without irritation. - 15% vitamin C visibly brightens skin - Ferulic acid & ergothioneine boost visible results - Gentle formula absorbs quickly for immediate results - Use alone or add to your non-SPF moisturizer or serum BENEFITS C15 Super Booster’s improved formula delivers high-potency vitamin C with minimized irritation. New technology targets dullness and uneven tone for a firmer, more radiant complexion with the addition of ergothioneine to boost efficacy for advanced results. Ferulic acid defends against discoloration and boosts 15% vitamin C’s stability. Diminishes visible signs of aging for brighter, smoother skin with an exclusive blend of 15% stabilized vitamin C (l-ascorbic acid) at a pH range of 3.1–3.5, potent antioxidants ferulic acid, ergothioneine, vitamin E and skin-smoothing peptides. You’ll see younger-looking and more radiant skin with each use. HOW TO USE When To Apply Use after cleansing, toning & exfoliating, up to twice daily. During the day, finish with amoisturizer with SPF30 or greater. Can be applied under the eye area, avoiding the eye itself. How To Apply Smooth 2-3 drops all over face & neck. Use on its own or add to your favorite serum or moisturizer. Up to 60 uses for full-size 0.67 fl. oz. bottle. INGREDIENTS Key Ingredients Ascorbic Acid, Ferulic Acid, Ergothioneine, Tridecapeptide-1, Palmitoyl Tripeptide-5 All Ingredients Aqua/Water/Eau, Ascorbic Acid, Glycerin, Ethoxydiglycol, PPG-26-Buteth-26, Mannitol, Tridecapeptide-1, Palmitoyl Tripeptide-5, Ergothioneine, Sodium Hyaluronate, Pentylene Glycol, PEG-40 Hydrogenated Castor Oil, Bisabolol, Sodium Gluconate, Decylene Glycol, Ferulic Acid, Oryza Sativa (Rice) Bran Extract, Tocopherol, Polyacrylate Crosspolymer-6, 1, 2-Hexanediol, Panthenol, Sodium Phytate, Sodium Hydroxide, Citric Acid, Phenoxyethanol