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Mavala Scientifique K+ Nail Hardener 5ml

Code: 21015
  • £10.70
  • RRP £14.95
  • You save up to 28 %
Item in Stock |
Mavala Scientifique K+ Nail Hardener (5ml) is a treatment allowing soft, flaking or split nails to become healthy and strong again.

As the most fragile, unprotected part of the nail, the tip breaks easily and benefits most from a strengthening process. Mavala Scientifique K+ Nail Hardener instantly penetrates and hardens the nail plate, allowing normal growth to be restored.

Scientifique K+ is an innovative product that hardens the nail plate thanks to a scientific active ingredient that improves the cohesion of Keratin fibres. Formaldehyde-free.

Directions of use:

  • Remove nail polish or any oily film and clean the nails thoroughly.
  • Brush Mavala Scientifique Nail Hardener on to the free edge of the nails and leave for 1 minute.
  • Apply twice a week at the most until your nails are healthy and strong, then twice or three times a month as necessary.
  • Never apply under the nails, on cuticles or on the skin to avoid hardening of the epidermis. If any product runs on to the skin, wipe off immediately with a dampened cotton pad.

If you'd like to know the ingredients for any of our products, please drop us an email and we'll send you an image of the product with the ingredients shown. Manufacturers change their ingredients regularly, sometimes without letting us know. By sending an image, we ensure that you receive a current & up to date list.

Shop online at Justmylook in complete confidence as all online payments are 100% secure. You can either pay using your card through our secure servers or alternatively checkout via Paypal for fast, convenient payment.

Justmylook offers free delivery on all UK orders via Royal Mail 48 & Royal Mail 48 Tracked. Delivery should normally take 2-3 working days depending on the time you place your order. You will be given an estimated delivery date at the basket page.

BLACK FRIDAY WEEK: It may take us slightly longer to process your order, but don't worry, we're working day and night to fulfill orders as quickly as possible. We'll send you an email when your order has been shipped and it should usually take around 2 days to receive your parcel after it has been dispatched.




Royal Mail 48 Tracked: Orders are usually dispatched the same day when placed before 2:00pm Mon-Fri. It should normally take 2-3 working days for delivery.

Royal Mail 24, Royal Mail Special Delivery & DPD: Orders placed before 3:00pm are usually dispatched the same day Mon-Fri. Orders after this threshold will be dispatched the next working day. 

Express Delivery

Express delivery is available from only £1.95. We dispatch our express orders via three different delivery options. The services available are Royal Mail 24 Tracked (not guaranteed), DPD (guaranteed) or Royal Mail Special Delivery before 1pm (guaranteed). Royal Mail Special Delivery is our only guaranteed Saturday service.

DPD express delivery service includes door to door tracking, SMS alerts and a one-hour time slot for delivery so you know exactly when to expect your beauty goodies!

Justmylook accepts no responsibility for transport delays or circumstances outside of our control causing late delivery. Delivery will be to the address advised in your order. We will only deliver to the address provided at checkout. If no one is available at the postal address provided at the time of delivery, a note will be left to advise you or Royal Mail may deliver to a neighbour. Recipients can opt out of Delivery to neighbour and can also nominate a specific neighbour if they wish. Details of how to do so can be found here:

We do not allow collections.

Returns Policy

If you would like to return your order, please contact us (via this form) prior to sending your parcel back. accepts returns on all orders, as long as you notify us within 14 days of receipt that you're wanting to return your order. You then have a further 14 days to physically return the products. You will be responsible for the cost of returning the goods unless we delivered an incorrect item or the item is faulty. Please ensure that you keep a copy of your proof of postage, as we can't be held responsible for goods that have either been damaged or lost in transit. Goods must be returned in their original, sealed packaging and re-saleable. (This does not affect your statutory rights) If items are received back damaged, or missing items we are entitled to make a charge to cover the cost of this, and thus this may affect the amount credited to you. We aim to process returns within 5 working days of receiving the item back. If we deliver an item in error or a damaged item, we will cover the cost of returning this to us if required. Please note that we will only cover the cost of standard shipping for this. If you do receive a damaged item, please do not dispose of this without prior written confirmation from us as we may require it returned (at our expense). In the interests of hygiene we are unable to exchange or refund any grooming, cosmetic or electrical products once the security or hygiene tag/seal has been removed, or if they show signs of use unless the items are faulty. 

Hazardous Materials (HAZMAT)

Please note that Royal Mail currently class nail polishes, flammable liquids and aerosols as "hazardous materials" and will only accept a limited number of these per parcel.

If your purchase exceeds the limits below then it will be delivered via an alternative method; Hermes if standard delivery is selected and DPD if express delivery is selected.


  • 4x nail polishes
  • 2x aerosols
  • Aerosols over 500ml
  • No flammable liquids can be shipped via Royal Mail
Review Summary - 4.7 out of 5 based on 28 ratings.
Sort reviews by:

I have used Mavala Scientifique for thirty years ~ it’s brilliant for nails!
Good price on this site.

November 27, 2019 |

Yes very good have used before

October 21, 2019 |

October 8, 2019 |

October 2, 2019 |

Really good

September 11, 2019 |

Only used once so cannot comment yet

August 29, 2019 |

Works well and protects

August 20, 2019 |

August 6, 2019 |

June 21, 2019 |

June 7, 2019 |

Unbeatable nail hardner recomended to me by a Doctor about 20 years ago have never looked back.

May 23, 2019 |

Early days but easy to apply dries quickly and seems to be working

February 1, 2019 |

January 22, 2019 |

January 8, 2019 |

Have used this product for years but unfortunately can't buy it locally.
I was somewhat disappointed that it took several days to arrive.

October 5, 2018 |

August 7, 2018 |

It's just very good and easy to use, no nasty smell,and just works.

May 4, 2018 |

My new holy grail for nails best thing I've EVER tried on my nails THIS really does works I've struggled to get my nails healthy long and strong for a while after I stopped wearing fake acrylic nails that had damaged my nails badly after 10+ years of wearing them and this is by far the only thing that has given fast and viable resulta over night by far better than any opi nail strengthen product!!

April 28, 2018 |

Great product and good price. Quick on delivering this product

April 25, 2018 |

Very good product arrived in good time.

April 13, 2018 |

It seems to be an excellent product: easily absorbed and dries really quickly.

April 5, 2018 |

March 23, 2018 |

Felt the change within days. Stronger nails.

January 31, 2018 |

Purchase to harden two nails for ukulele playing. Easy to apply. Too soon to comment yet.

January 24, 2018 |

January 16, 2018 |

Started working for me after just one application. It was obviously just what my damaged nails (after constant nail gel use) needed. I have been applying an inexpensive nail strengthener base coat on my nails after each twice weekly Mavala application and this seems to work well with the Mavala, when it never did before. Tips of my nails are getting stronger each day. Definitely worth the money. It only needs to be applied to the tip of the nail twice a week max, so will hopefully last for ages.

November 3, 2017 |

Carol Baggott

This nail hardener is brilliant, it really works, have been using it as per the instructions. My nails are much stronger and healthier. I would highly recommend this product. I might add I never write feed backs. But am so happy with the result, that I had to on this product.

June 30, 2017 |

Scientifique Nail Hardener 5ml

March 16, 2017 |