Yon-Ka The History


1954 to 1967 : turning passion into creation
Pioneers in aromatherapy, Cécile, Ernst and Charles Muhlethaler are passionate about aromatherapy and in 1954 they found the Laboratories Multaler. At the time, the wealth of ancestral and empirical knowledge they were able to draw upon was shared only by a small number of scientists, chemists and doctors.

The Essential Oils
At first they focus on the subtle aromas of the botanical world, the essential oils charged with solar energy. They experiment on themselves, family and friends, the therapeutic properties of the plants: purifying, healing, psychotropic…
Their research leads them to a breakthrough discovery: “Quintessence” a unique combination of 5 essential oils from the Mediterranean which becomes the cornerstone of their future skin care line.

Plant and fruit extracts
But why limit oneself to the essential oils, when so many other wonders known for hundreds of years can be drawn from plants? 
They broaden their research, blend essential oils together with plant and marine extracts, in lotions, creams and massage oils, unveiling new synergies. Medical doctors, physiotherapists and aestheticians are involved in the evaluation and testing. Success is immediate and the professionals are appealed both by the originality, the pleasant feel of the products and the power of their balancing aromas only surpassed by their efficiency, their immediate and visible results and the positive feed-back from the users. Clients rave about this new sensations in simple words: “thanks to the treatment it is as if my skin is breathing again, I feel good and it shows”

From this moment on the products are available with the brand name YON-KA, a symbolic and mysterious name.


 Since 1968, growing from small-scale operation to international company with the same passion

Françoise Muhlethaler, a biochemist, and Catherine Muhlethaler, an aesthetician, daughters and nieces of the founders take the lead of this French family owned company in 1968. Driven by the same passion and values like their founding predecessors and parents, they bring the company to the next level both for the industrial processes and the commercial development. With pride and ambition for the brand, they open 3 subsidiaries: starting with the USA in 1987 soon followed by the United Kingdom and Switzerland in the early 2000.

Day after day they build relentlessly and bring the company to the next industrial level: the factory is set and organized according to the highest standards in the industry: products are manufactured according to GMP standards (good manufacturing practices) in a filtered air environment. They support and organize in house Research & Development, Quality and Applications with a skilled team of pharmacists, chemist engineers, biologists, bacteriologists, aestheticians, in order to master the development and production of the products and allow objective efficacy testing.

Based in the Paris metropolitan area, the company is now set on premises of over 86,000 square feet. It develops its own exclusive formulas, manufactures, inspects, controls and distributes Yon-Ka worldwide.

The Yon-Ka phyto-aromatic products have acquired an international recognition as experts in Phyto-Aromatherapy. They can be found in more than 50 countries present in more than 5000 of the most exclusive spas and resorts, collaborating with dermatologists and plastic surgeons. Yon-Ka today is the only brand that can offer a unique sense of well-being while delivering immediate long lasting results to the most demanding skins.


2003, l’eSPAce Yon-Ka, the flagship spa in the heart of Paris


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