I love this product! It's expensive, especially as I have no income at the moment, but it really works. I've bitten my nails for over ten years, and I also have a habit of peeling my nail polish rather than removing it properly, yet I have noticed that my nails are stronger and don't peel as often as they did before I started using this product around a month ago.

I love this product! It makes my nail really really strong and they have stopped ripping and chipping. I also use this as a base coat for when I can't be bothered to go through the whole routine of adding a coat every other week.
I have heard it makes your nails yellow but I haven't had that yet, but I will add to this review if I do.
I listed it as not expensive because I know you can get it off places like Amazon and eBay for about £9 which is a great investment as it doubles as a base coat too.
It comes with a really nice wide brush which is super comfy to use and it dries within a minute or two, for me anyway.

This is what gave me nails I'd never dreamt of having. I had bitten my nails for over 20 years and to be honest I didn't care what state they were in until my now husband proposed nearly 2 years ago. Then I panicked lol I decided to tune into an Opi show on qvcuk (never watched or ever been interested before) and this was billed as a nail life saver! So of course I ordered it along with the Avoplex oil for my ragged cuticles. I followed the instructions and battled through the urge to bite them and came out the other end a few weeks later with strong smooth healthy looking nails with no urge to bite at all, and massaging in cuticle oil day and night had rid the ragged bits I actually became really proud of them and started investing in opi lacquers which I love! They are lovely nd long now and I haven clip and file them down now. If you can get one please get the Leighton Denny crystal nail file it keeps the edges smooth and water tight I wouldn't use anything else. And please get nail envy mine were in a bad way wish I had a pic of them before. Highly highly recommended.

I just purchased this product a week ago and I'm so happy i got it I'm in love! Before using opi nail envy i used Orly strengthening and repairing something like that and it seriously did nothing.. So i read alot of reviews about this and it seemed good but also kinda expensive so i got it off Amazon for $5 which is an awesome deal. I've used it 3 times already (I'm an excessive nail painter) and my nails are really strong I'm impressed, before my nails used to bend alot ..if you know what i mean? And I've been trying to grow them out but it was impossible because they kept breaking, now omg i can push down in my nail and it won't even bend, underneath my nail will hurt because it won't budge haha. But i definitely recommend this to anyone who wants stronger nails and especially to anyone who wants to grow their nails out and is having difficulty

for what it's worth, this works. my nails have never been this long for this long, weeks of strength. i am impressed! will buy again.

This product did not work for me. I have thin peeling nails that rip (not break) very easily and this product did not make much of a difference. Maybe slight. I tired nailtique formula II after and I'm already seeing a difference.

My nails have always been quite brittle due to a profound lack of dairy consumption. I'm also very rough with my hands at work so my nails tend to break and chip a lot. I maintain them by keeping them cut short but when I started wearing polish regularly, I decided that I needed to look after my nails a bit more and picked up Nail Envy online to give it a try. I haven't used this long enough yet to see any visible differences in the health and strength of my nails, but I have to say it's the best base and top coat ever! My polish stays pretty and unchipped for a good many days longer and the colour just shines through!

Ok, so this is über expensive, at like £18.95 or something from Boots! Anyhow, I took the plunge as I gave my Essie strengthener to my mum! I'm happy with this. Two coats applied at first, then another coat every other day. My nails were a mess after using nail polish every day etc. peeling and breaking nails meant I had to trim my nails down to short length and invest in a decent nail strengthner. This makes my nails look instantly healthy wi a nice gloss, no colour, and from what I see it doesn't flake or chip. My nails, after just a few days (!!!) feel stronger and look a little longer and better for it!

Yes I will repurchase when I run out as I love nail polish and know over use can damage nails, as I've seen it happen to my own lol!

This really helps nails, and if you are an avid nail polish user, I can guarantee this is one investment you should make!

I have weak nails. I thought it was the nail biting but once I stopped biting my nails I realized they were still peeling and bending ect.. I came upon this little gem because I was looking up strengthening base coats.
So I decided that I had to try it so I bought a small size online. I loved it, so after reading all the reviews I went to my local ulta and I was flabbergasted to see that it was almost 17 dollars.. Yikes. So I went to my favorite place ebay and found it for $9 including shipping. I got it in less than 4 days. I love it. I use it as a base and topcoat sometimes when I'm not using my quick dry topcoat. I've been telling everyone about this. Amazing. To save on the price order it online.

Wow. Seriously.
I bit my nails from the age of twelve, tried all sorts of remedies, from Sally Hansen, cuticle oils, pastes, creams, that bitter stuff, and even plain ol' bribery!
Hurtling towards my 31st birthday and I decided that enough was enough - time to a) start treating my nails with respect and b) get them properly strong.

This OPI is a game changer. Combined with now wearing gloves for washing up, not using my nails as tools, and upping the ante on hand cream; well my nails are absolutely fabulous!
It took a while to get used to how strong this makes your nails, there was a bit of layering/flaking initially, which has now stopped.

This may be eyewateringly expensive, but balance that against the eyewateringly joyous tears, as I look at my well manicured nails I've been trying to achieve all my life; and...well, suddenly I don't mind paying the price!