Daily Mail journalists select and curate the products that feature on our site. If you make a purchase via links on this page we will earn commission - learn more

If you're no stranger to damaged nails, whether it's from repeated biting or improper removal of nail extensions, now is the time to get them looking and feeling healthy. 

And achieving strong, smooth nails has never been easier thanks to these offerings from OPI as shoppers can save 20 percent when applying discount code TREAT20 at checkout. 

Repair Mode Bond Building Nail Serum  £18.56 (save £4.64)

For those with damaged, weak or brittle nails, this is the product to turn things around.

Made with patented Ulti-Plex, this nail serum penetrates the nail surface to build new bonds from within - leading to an impressive 99 per cent nail keratin repair, and stronger, smoother nails. 

Shoppers can save 20 percent when applying discount code TREAT20 at checkout until June 23 2026. 

Shop

“OPI Classic” Nail Envy® Nail Strengthener (Sheer Colour)  £14.72 (save £3.68)

This nail treatment was designed to  strengthen and protect nails to reduce chipping, peeling and splitting. 

Infused with biotin, calcium, and vitamins A, C and E, this leaves your nails 95 per cent stronger in just a week. 

And it's also available in a range of colours, from red, to glittery navy, to pinky nudes. 

Shoppers can save 20 percent when applying discount code TREAT20 at checkout until June 23 2026. 

Shop

Right now, shoppers can save 20 percent when applying discount code TREAT20 at checkout

Designed to renew and improve your nails within just six days of consistent use, the Repair Mode Bond Building Nail Serum smoothes and strengthens your nails, making them more resistant to breakage and diminished ridges. 

This serum is formulated with OPI's patented ulti-plex technology which penetrates the nail surface, and then builds new bonds from within the nail, strengthening the entire nail, not just the surface. 

Credited with reforming biters and gel addicts' talons, with fans saying their 'nails are the strongest they've ever been', the frequently sold-out bottle is now back in stock and reduced to just £18.56 thanks to our discount code TREAT20.

The result? 99 per cent nail keratin repair. So, not only will you have stronger, healthier-looking nails, but over time, you'll be less likely to want to damaging nail extensions. 

One satisfied customer stated how they like using it after having an acrylic set, saying, 'Been using this [Repair Mode] for a couple of years now, I have never been able to grow my nails. This really fixes my splitting nails.

'Ordered another as I have worn Acrylics for 2 months, after just 7 days my nails are looking normal again, going onto Nail Envy now to strengthen and give them a chance grow again.'

And with consistent use, your nails are set to have 94 per cent protection of keratin protein from damage, meaning it not only helps restore your nails, but ensures that they stay healthy long-term. 

With consistent, repeated use, you'll have four times stronger nails in just six days

Even better, the formula is made with no animal products or by-products, making this a great nail treatment for vegans. It's also 9-free (as well as all other OPI polishes and treatments), so it's perfect for those who want no nasties. 

OPI Nail Envy is another popular treatment for peeling and splitting nails. Formulated with biotin, calcium, and vitamins A, C and E, this formula helps nourish and protect the surface of the nails, leaving your nails looking healthy - in fact, they'll be 95 per cent stronger in just one week. 

'My nails were badly damaged after gel nails (I'm on blood thinners) and the nail bed was bruised and the nails broke at the slightest touch. Nail Envy strengthened them within a week. Great product!', raved a thrilled shopper. 

94 per cent of consumers said nails felt instantly improved when consistently using the OPI Nail Envy 

And it's not just sheer colours available - you can shop Nail Envy in a range of colours, and is available in pinks, red and blue in both summer and regular finishes.  

'I believe my nails have never been stronger and healthy looking. They no longer feel brittle or prone to breaking, and instead, they have a natural shine and smoothness that I’ve always wanted,' said a customer about how Nail Envy transformed their nails. 

Don't forget, you can save 20 per cent on Nail Envy and Repair Mode by applying discount code TREAT20 to checkout until June 23 - stronger nails have never been so affordable!