This is what their website says: Dermatologist-developed to be safe, comfortable. Yet in clinical trials our serum was comparable to a leading prescription ingredient in creating a more even skin tone. A verified 53% improvement in skin tone. For all ethnicities: See results starting in as little as 4 weeks. At 12 weeks, see a visible reduction in dark spots, age spots, and traces of acne past.
My results: I have used it 4 times in about 10 days (I know, I know, I keep forgetting to use it before bed). I LOVE IT. My skin is more glowing, and I believe more evenly toned - even with constantly being out in the sun acquiring a tan (and the face skin of a woman of my young age does NOT tan evenly!). I had been using Philosophy's Save Me, and I thought that was great, well, THIS IS EVEN better! My skin feels better and it feels fabulous when I run my hands over it (when I'm washing my face) - so soft and smooth!
(This is NOT a paid promotion - just a product I had read about and then found in the Cancun airport for 15% off AND with no tax. I couldn't resist trying it at a discount!)