Hai Evies, I have had a lot of hormonal acne for several years and have a lot of scars on my face, I came across this product on the internet complete with before and after photos of people and a lot of good reviews, so had to try it. Niacid is a K-beauty product that would be good for scars and color changes in the skin due to acne, it would also soothe the the skin. It is a transparent almost watery serum with no smell. I pat it on my cleansed face as a first step. I've been using it for about 3 months now, I thought I'd see some change quite early, but was afraid I might want to see that. Now after 3 months I can say that my skin is a lot quieter, the scars are really a little less present and less deep. I had a mini crater on my nose 🙈 that I had for a while, really an ugly scar due to a hefty subcutaneous pimple, which is almost pulled away. Also, the colour difference, dark scars and redness are much less. My skin is far from ideal, but it certainly helped me and I'm glad I found this product!