Duo IN & OUT
Duo IN & OUT
Duo IN & OUT
Nail care

Duo IN & OUT

The personalised IN & OUT duo for healthy nails, all year round!

The IN & OUT routine adapted to each type of nail: 2 nail cares working in synergy for a visible and long-lasting result.

Only 999 items in stock!

Duo IN & OUT

Only 999 items in stock!
Free shippingwhen you spend £39 or more
Secure paymentCredit card and Paypal
Eco-friendly packagingDelivered in 100% corn-starch packaging chips


  • Up to 84% bio-sourced ingredients
    Plant-based ingredients extracted from natural, renewable sources
  • Made in France
    Products made in France
  • Vegan
    Our aim is to develop products without using ingredients that come from animals or the farming of animals
  • 12-free
    Green Flash
  • Eco-friendly packaging
    Recyclable packaging, FSC cardboard and biodegradable packing peanuts
  • No toxic ingredients
    Products formulated based on a strict blacklist

Kit content

  • Nail Boost

    Nail Boost

  • The treatment base coat of your choice

    The treatment base coat of your choice



IN : Nail Boost food supplements act from the inside to provide all the elements necessary for the synthesis of keratin, the main component of nails and hair. A complete formula for strengthened nails and boosted growth.

OUT : the base acts locally to respond to a targeted problem and to sublimate the nail. Choose the base adapted to your needs.


  • A customizable routine to meet all your nail needs
  • Bio-sourced formulas
  • Recyclable & eco-designed packaging

How to use Nail Boost food supplements?

As a treatment, take 4 capsules a day (for no more than 3 months)
For maintenance, take 2 capsules a day (for no more than 6 months)

View ingredients

Protocol We tell you everything!

  1. File your nails into your desired shape
  2. Gently buff each nail for 5 seconds in the direction of growth
  3. Use the cuticle remover and cuticle pusher to push back the cuticles
  1. Apply Green Oil to the surface of the nail
  2. Remove the oil from the surface of the nail with a gentle nail polish remover
  3. Use the treatment base coat to care for and protect your nails

Reviews Our customers talk about us!

Our reviews are collected 2 weeks after any purchase and these are the reviews of verified buyers only
Reviewed at
Was this review helpful?
Verified Buyer
5.0 star rating
Review by Caroline on 9 Jan 2021 review stating Prometteur
On verra après plusieurs semaines mais ce produit semble efficace