I started using this product in November. At first I didnt notice anything special about it. But in the past few weeks I have found that it has greatly improved the health of my nails. They seem to grow effortlessly and never break. The one thing I dont really like about it is that you shouldnt wear it under nail polish. You have to use it and only it. So for a few weeks I use the Oxygen and then I switch to color for another few weeks.