Phloretin CF.

"The SkinCeuticals Phloretin CF is 100% my jam. It is a potent antioxidant serum designed to protect against free radicals and environmental aggressors like pollution and UV rays. It will help even out skin tone, reduce discoloration, and enhance skin radiance. It's specifically formulated for more of an oily to combination skin, making it a great alternative to what I consider stinky C Ferulic, but if you have really dry skin, C Ferulic might be better for you. The key ingredients in this one are 2% Phloretin, which is derived from apples and the bark of fruit trees like pear and grapefruit. The Phloretin helps neutralize damaging free radicals, aids cell turnover, and improves the appearance of discoloration. This also has 10% pure vitamin C, which is L-ascorbic acid. This is a very potent antioxidant. It protects against oxidative stress, brightens the skin, provides visible anti-aging benefits. And it has 0.5% ferulic acid, which is a plant-based antioxidant that enhances the stability and efficacy of vitamin C and E while neutralizing free radicals."

"Skinceuticals Phloretin CF has L-ascorbic acid, ferulic acid, and phloretin. Skinceuticals works as you would expect. The reason I think vitamin C works so well is not only just because it's an antioxidant but also because this apple browning reaction involves an enzyme called polyphenol oxidase, it needs copper to work, and ascorbic acid can interact with copper, it can grab onto it, and this is actually thought to be part of how it inhibits tyrosinase to reduce pigment."