OPI Original Nail Envy is a nail strengthener with wheat protein and calcium that helps nails grow stronger, harder, longer, and prevents cracking and breakage. Nail Envy works best when directly in contact with the nail which makes it an excellent bast coat, however it can also be used as a top coat.
Usage Instructions: Apply one coat every other day for one week than remove and start process again applying every other day.
My granddaughter, an aesthetician, recommended it to me.
OPI products are the best on the market. They actually do what they claim.
I start every one of my own manicures with Nail Envy and, along with 10,000 units of Biotene every day, I have thicker hair and healthier and stronger nails.
It was recommended and am pleased with the results so far.