White Iodine
For more than twenty years, my fingernails have been soft and peeling off in layers like nail polish!  I finally read about white iodine in Heloise's Hints.  Within the first week of using it daily, the iodine bonded the peeling layers together! But took several months (until they had completely grown out to grow as strong and unbreakable as they are now. According to Heloise you're supposed to use it daily for one week and then after that once a week.  I now (after a year and a half) only apply it once every two or three months! If you continue to use it too often it apparently makes nails too brittle!
Rating: 5 stars