I've been using this serum for a few weeks now and I'm noticing a clear difference! I have a large pigment spot on my left cheek and it has become less visible in the meantime. I also had a bit of acne, especially from wearing face masks at work. And I noticed that my acne disappeared faster now because of this serum. I use this serum twice a day, morning and evening. It is very easy to apply and spreads well without feeling greasy. It also smells great, so this is a nice bonus. Subsequently, this product has not been tested on animals and is a vegan formula.