Intentionally formulated Glycolic Acid Serum that helps correct signs of irritation and hyperpigmentation.


Everyday skincare solutions rooted in science and nature


Discover the collection and unlock your skin’s intuition.


  • Crafted for all skin

    Our line has been clinically tested on all skin types & complexions.


    Proudly made in France, our line is dermatologically tested and clinically proven.


    Our formulas are made under pharmaceutical standards, in a Zero Waste & GMP site.

  • Cruelty Free

    All of our ingredients are proudly Leaping Bunny certified and fully traceable.

  • Our Formulas

  • Nature's Bond

Our skincare essentials are curated with lab-crafted ingredients and botanical essences that nurture, protect and enhance your skin health.

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Bionassay is a gentle reminder of our peaceful bond with nature's majestic mountains while simultaneously holding meaning and intention to our connection with the words biology and assay. 

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  • Clinical Results

  • Patient Results

A daily leave-on gentle exfoliant that replenishes the skin barrier by blending Glycolic Acid, Honey, Chicory Root, and Chamomile.

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Results after using Éclat de Lait for 28 days.

  • Significant decrease of eye laugh lines (crow’s feet wrinkles) by -25%.
  • Significant decrease of smile lines (nasolabial fold) by-15.
  • Significant decrease of skin texture by 4.39%.
  • Significant increase in luminosity by +31%.
  • Increase in uniformity of skin tone +4%.
  • Excellent tolerance on the face and neck.
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  • The radiance of the face is revived - 97%
  • The skin is comfortable and nourished - 97%
  • The skin is re-densified  - 97%
  • The lines are smoothed - 97%
  • The skin texture is improved - 94%
  • The skin texture is improved - 94%
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Les Archives

Les Archives is an homage to healthy skin and an outlet for a grounded mindset. Discover our educational and inspirational journal entries.



This product minimized my pores, giving me an instant glow boost in only one week of use. It's gentle enough on the skin and leaves it super soft and clear. My skin feels super hydrated and nourished. I love it, and I can't wait for my second bottle!


I can not remember the last time I wrote a review, but I had to for this one. My skin has always been sensitive and trying new products has always been risky for me, but I couldn't be happier with my results after using Bionassay. Not only does my skin feel soft, but it also looks healthier than it has in years. Eclat De Liat specifically gives me the glow I have been searching for.


This cream has completely won me over with its dual benefits. First, it keeps my skin beautifully hydrated without feeling heavy or greasy. It's like a refreshing drink for my skin, and I love how it sinks in quickly.


This cream is simply addictive! The texture and scent are pure magic! Using Neige Eternelle is an incredibly luxurious and indulgent sensory experience that leaves me feeling pampered and rejuvenated each time. Due to its soothing texture, I primarily use this cream at night and as a moisturizer after my retinol. I just love it!