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A story made in France

70 years of a human adventure.

IRD and production site building in Epernon with lavender in the foreground

You don't give your all without a good reason... At Expanscience, we help individuals shape their well-being, from the youngest to the oldest.

It's what has inspired us to move forward, carry out research, and innovate for over 70 years!

A responsible and committed company


We’ll state it up front: the Expanscience teams are proud to work for a French family-owned group. Why? Because this explains our roots and our ability to have a long-term vision. 

We know where we come from and where we’re going. This enables us to make strong strategic choices that are often pioneering, such as the decision made in 2004 by our President, Jean-Paul Berthomé, to voluntarily commit Expanscience to a Corporate Social Responsibility policy.


Jean-Paul Berthomé, President of Expanscience

Two men, one French company


What we are today we owe to an encounter between two men in 1950. On the one hand, Paul Berthomé (father of the current president of Expanscience), a businessman and industrialist. On the other, Claude Guillon, a pharmacist.

Together, they decided to undertake the design, production and marketing of a lotion for babies that cleansed tender skin while moisturizing it. At the time, this was a revolution, as was the wish to develop and manufacture using the same quality criteria as those drawn up for pharmaceutical products.

It was the birth of our Mustela brand and the start of our company adventure!

Claude Guillon, pharmacist, and Paul Berthomé, businessman and industrialist

A 70-year saga

First Mustela product


The adventure starts with the creation of Laboratoires Expanscience and our Mustela brand.

Lupine fields


We use our know-how in the area of fatty substances and molecular distillation to create a cosmetic active ingredients business.

Three happy kids


The Mustela Foundation is created to support research projects focusing on child development and parenting.

A grandfather, a father and a little boy collecting tomatoes


With Piascledine 300, we enter the Rheumatology area and provide support for patients suffering from osteoarthritis.

United Nations building with flags of the whole world


Building on our values and the commitment of our teams, we join the United Nations Global Compact.

A hand with a green leaf


Our CSR policy is recognized as “Exemplary” with the CSR Committed label

Expanscience employees holding a banner Proud to be B Corp


Our company takes another step forward by becoming the world’s first pharmaceutical and dermo-cosmetics laboratory to receive B Corp certification.

Zoom in on the arms of four people checking hands


We launch our impACT strategy to become a regenerative company with a positive impact by 2030/2040.

Image with dark blue background and mention "Expanscience becomes a mission-driven company!"


We become a mission-driven company: a major step forward in transitioning to a model with a positive impact.

Sublimed logo


We are acquiring Sublimed, a French Medtech start-up specialized in the development of medical devices for managing chronic pain.

Epernon, the heart and lungs


In 1957, the two founders of Expanscience decided to implant their production site at Epernon, a small town in the Eure-et-Loir department.

Since then, the town and our laboratory have written their history together. This site has never stopped being at the core of our transformations and development.

IRD and production site building in Epernon with poppies in the foreground


of purchases made in France


million products manufactured in 2023

All the French know-how of Expanscience radiates throughout the word from Epernon. Our historical site is home to both our Innovation, Research and Development (IR&D) and production teams, representing approximately 300 employees.


patents applied for worldwide since 1997


of turnover was invested in IR&D in 2023

Our local implantation at Epernon is an integral part of our identity and commitment. Our site is fully part of local and departmental life and is one of the local economic lungs.


is the percentage of jobs in the pharmaceutical, cosmetics and chemical sector we represent in Eure-et-Loir

The future belongs to the young generations! Michel Chasles School in Epernon x Expanscience In 2010, we established a partnership with the Michel Chasles school, a member of the network of schools associated to UNESCO. Goal: Make eco-delegates aware of environmental issues and organize a series of local actions with them #KnowledgeTransmission - Regular information on our CSR policy - Participation in the Company Forum at the school #Cobuilding #Biodiversity  - Building of insect shelters and birdhouses   An initiative recognized by the UN!  #EcoSolidarity Contribution to a three-day eco-solidarity bike trip, where 27 middle school students discovered the historical and cultural heritage of their region #Future And since we’re convinced that the young generations are key players in changing towards a better world, we invited these students give us their thoughts on our new CSR commitments for 2030! To learn more about other actions, go to the “Our Purpose” page !

There is greenwashing... and then there are committed companies like Expanscience. As proof of this, our Epernon site is the first place where we apply our commitments to societal and environmental responsibility. It has thus been recognized with a number of certifications for quality, management and environmental protection.

100 %

renewable electricity purchased at Epernon since 2018


ISO 14001 and ISO 45001 certifications and an HQE (High Environmental Quality) building

The family continues to grow with Sublimed


In 2023 we acquired the French start-up Sublimed, as part of our commitment to developing new solutions for relieving osteoarthritis-related knee pain.

Sublimed is a Medtech specialized in the development of medical devices for managing chronic pain, with which we have been working since 2016 and which contributed a great deal to developing VitaliTENS*, a transcutaneous electrical neurostimulation medical device that acts as a drug-free alternative to painkillers.

Our shared goal? To act on chronic pain while offering drug-free solutions, in particular for osteoarthritis of the knee. We do this by working with health professionals and people experiencing chronic pain, on the principle of open innovation.

This merger enables us to have better control of our value chain and to join forces with a company whose values we share, including choosing to manufacture in France, incorporating sustainable development issues into the company strategy and supporting the United Nations Global Compact.

Sublimed team

*VitaliTENS is a Medical Device designed to treat chronic knee pain in adults suffering from knee arthritis (1). This medical device is a regulated health product which bears CE marking, in accordance with the same regulation. Manufactured by Sublimed (813 959 012 RCS Grenoble, France). Distributed by Laboratoires Expanscience: 1 place des Saisons, 92048 Paris La Défense Cedex, France (RCS Nanterre B 331 930 081).
(1) VitaliTENS leaflet. Read the instructions in the leaflet carefully. ASK YOUR DOCTOR FOR ADVICE.

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