I was excited to try this because of the vitamin C reputation, but after a few weeks my skin was red and itchy. I didn’t notice much brightening, and the serum got darker in the bottle pretty quickly.

I appreciate that they were early pioneers of Vitamin C in skincare, and the Advanced-C Serum is strong—but it oxidized quickly and caused a bit of irritation on my skin. Results weren’t consistent, and the packaging could use a refresh. Science-driven, yes, but not quite elegant or gentle enough for daily use on my skin.