I tried the Essie Hard to Resist Strengthener, (neutralize & brighten (the purple) i noticed within a couple of days that my nails were looking better but were feeling stronger. Since i was a child my thumb nail has aways spilt down the middle. I have tried all sorts of strengthing products to fix it, with no luck. But looking at my thumb nails now there is no spilt. They are looking healthy. So would highly reccomend the Essie Hard to Resist Strengthener.
,
It takes a couple of weeks to see any results, but really does help to make nails stronger. Does dry nails out a bit.
Tips: Would suggest using a cuticle oil aswell, as nails could dry out a bit