Was looking for a genuine product and came across this one, and believe you me, I was astonished by its results. My fish had ripped a fin and broke half way the tail, and it was the same for almost a week. After using this product I saw a drastic increase in healing of the fin, it has almost been a week and the fin is coming back to its place rapidly. Unlike any other product I have used thus far. I hope my review helps others.