How do we know?

I'm asking for anyone's success stories regarding alpha arbutin and am wondering what percentage to use it at

I used 20% 2 years ago for acne scars..
The first 2 months I haven't seen any results
But on the third month I started to see some major improvements..

Ok,thank you some help at last! And so did you dilute pure arbutin powder yourself or find a cream or gel with that percentage because I can't find anything over the internet

No, I just bought crems.. less mess

No, I just bought creams.. less mess
You can find AA at dayscience.com very cheap and effective

Could you advise me where to get these from as I have searched the internet and cannot find a product with that concentration

You can find it at dayscience.com

I got mine from dayscience