Ingredients: 15 Percent Vitamin C: Visibly evens tone and firms and defends against aging freeradical damage. Ferulic Acid: Fights discoloration and stabilizes vitamin C. Ergothioneine: Visibly improves uneven tone and boosts vitamin C's efficacy. Ferulic acid helps fight against discoloration while ergothioneine improves efficacy and uneven tone for radiant, youthfullooking skin. It is clinically shown to boost glow and reduce the look of wrinkles in as few as 15 minutes. Clinical Results: In an independent clinical study with 30 subjects in 12 weeks, results based on twice daily usage included: Clinically shown to boost glow in 15 minutes​ Clinically shown to visibly brighten and improve radiance and wrinkles​​ In a selfassessment from an independent clinical trial with 30 subjects, after 12 weeks: 100% agree it feels nonirritating on skin | Paula's Choice C15 Super Booster, 20 ml | Dermstore