I've used the trial size of this product a couple of times now, and it really does work to reduce hyperpigmentation. Reduce, not remove completely. For reference, I am dark skinned with lots of acne scars made worse by lack of sunscreen in my younger years. By the time I've used the bottle, my skin tone looks a lot more even. I believe it's a product that needs to be used consistently over a long period of time to see the full benefit and that's where a star is lost. This serum is prohibitively expensive. I really like it but can't purchase it consistently. Definitely get the trial kit if you're not sure- you should see some results within a couple of weeks.