I had soft thin nails for 70 years, tried several things to no avail. I read an article about nails saying to apply white iodine to nails for 10 days then once a week. The white iodine (from a pharmacy)sometimes called clear or decolorized iodine has worked for me. Just go by these directions. My nails are thicker,stronger and longer. It is wonderful to have nails I can use to pick things up now. Bottle cost $5.00 and has lasted well over a year and not near finished.