I used to use this OPI Nail Envy Nail Strengthener years ago but then forgot about it, luckily though, I recently "rediscovered" it! It claims to make natural nails harder and stronger within weeks of use and this I can say is definitely true. My nail bed is smoother, stronger, with less peeling/splitting, and the ends are a nice bright white (no need for a french manicure!) My only complaint is that it has formaldehyde in it and it is unfortunate that it's "sister" formaldehyde-free nail strengthener just doesn't measure up and provide the same results.

This is my go to product. I do not feel complete unless my nails are done and every at home manicure starts with OPI Nail Envy. I love how strong it makes my nails, I am able to keep them longer and play with the shape of them without worrying about them breaking easily. I have been using this product for years, the original is my favourite and while it is pricey it is 100% worth it.

Great classic product. Keeps my nails from splitting and peeling and helps them grow. My boyfriend even gets me to paint his toenails with this as he has broken and brittle nails from playing soccer! Lol

Love this product.. If you could see the basket of nail strengtheners I have I have tried them all.
So my nails in the past where very brittle and would crack and peel all the time they looked ugly and I was always envious of other womens nail. I have used this for over 5 weeks I love the product. Its pricey and does work. I was luck one day and got a bottle of it at Marshalls for 9.99.

I have really brittle nails that always break when they aren't even that long, I have tried so many products that never give good results but this stuff worked wonders

This is a little pricey but a lot of my client love this stuff. It glides on easily and last quite awhile. Great for using on its own or as a base coat.

If you have weak nails that break all the time then this product is for you. In just a couple treatments my nails went from being soft and splitting to being being hard and beautiful and they actually grow now!

This nail strengthener REALLY works. If I use it properly and consistently the strength of my nails improves so much. Even If I just use it once a week it helps. But best to use it daily as the instructions suggest. I prefer the glossy finish over the matte finish at it makes my nails nice and shiny and healthy looking. It's $20 a bottle but it lasts quite a while.

Love the OPI nail line! I really love the nail strengthener and all of their polishes. I do find when i wear this it does strengthen my nails. They are not as brittle.

I love this nail strengthener. It keeps my nails from flaking and breaking off. I apply it about 1 or 2 times a week and I've noticed a difference in how may nails grow back stronger and I can actually grow them longer than before. I love the shine that it leaves on my nails which lasts for days. Pricey but worth it.