An Inserm study published in April 2026 confirms it: in just 5 days, reducing your hair products is enough to significantly decrease your exposure to endocrine disruptors.
Endocrine disruptors in cosmetics: what the Inserm 2026 study reveals... and why your hair routine needs to change!
May 29, 2026
A scientific study that changes everything
On April 7, 2026, researchers from Inserm, Université Grenoble Alpes, and CNRS published a conclusion in the journal Environment International that is as simple as it is impactful: in just 5 days, reducing the number of cosmetic products used and choosing formulas without certain chemical substances is enough to significantly decrease the levels of endocrine disruptors in the body.
A result that raises an unavoidable question: are you ready to rethink your hair care routine?
Endocrine disruptors: definition and concrete consequences for your health
Endocrine disruptors are chemical substances, natural or artificial, that interfere with hormone production or function. Present in many everyday products, they alter the endocrine system and can induce harmful effects on the body, including that of unborn children.
Their consequences are numerous and often underestimated:
On fertility and reproduction: decreased sperm quality, ovulation disorders, difficulty conceiving, fetal developmental abnormalities. Some effects appear in utero, with repercussions visible much later.
On child development: exposure during pregnancy or early childhood can disrupt neurological development, affect puberty, or promote early obesity—effects that sometimes only become apparent in adolescence.
On the hormonal system: thyroid dysregulation, disruption of estrogen or testosterone production, insulin resistance. These substances mimic or block natural hormones, causing imbalances that are difficult to identify.
On the risk of hormone-dependent cancers: the French National Cancer Institute now recognizes certain endocrine disruptors as being associated with breast, ovarian, thyroid, prostate, and testicular cancers.
A crucial point: these effects do not result from massive and occasional exposure, but from chronic low-dose exposure—exactly what is generated by the daily use of cosmetic and hair products.
What the study reveals: the cumulative effect of your routine
Researchers analyzed the presence of chemical compounds—parabens, phthalates, bisphenol A—in the bodies of participants, before and after a modification of their care routine. The rule was simple: reduce the number of products and prioritize formulas without controversial substances.
The results are conclusive. In just a few days, the levels of these compounds decreased significantly. The conclusion is direct: exposure is directly linked to everyday products, and the body can eliminate them as soon as the sources are reduced.
It is not an isolated ingredient that is problematic. It is the cocktail effect: the sum of all hair and cosmetic products applied each day—shampoo, conditioner, treatment, styling gel—creates continuous and cumulative exposure, even at low doses. It is precisely this silent mechanism that this study highlights.
Maison Jearom: a concrete answer, formulated with rigor
This study confirms what has guided Maison Jearom since its creation.
Our conviction is simple: the formulation of hair care products must be rethought to limit controversial ingredients as much as possible, without ever sacrificing performance or the pleasure of use. We reject the idea that one must choose between effectiveness, safety, and respect for the planet. For us, these dimensions coexist naturally. They are even inseparable.
That's why our hair care products are developed without unnecessary water, without chemical preservatives, and without endocrine disruptors, in a concentrated solid format. A more minimalist, cleaner routine, more respectful of your health, for the long term.
Specifically, Maison Jearom products are:
- 100% natural, rich in carefully selected active ingredients
- Sulfate-free, silicone-free, plastic-free, paraben-free
- Vegan, biodegradable, made in France
- Formulated at a pH of 4.5–5.5, favored by professionals for long-lasting hydrated hair
- Validated by a Doctor of Pharmacy and approved by expert hairdressers
Fewer products, more effectiveness: the solid format as an obvious choice
The solid format is not a compromise; it's a choice for performance. By removing water from the formulas, the concentration of active ingredients is higher. You use less product, get better results, and mechanically reduce your exposure to undesirable substances.
A simplified routine is also a routine that respects your body more. This is exactly what the Inserm study demonstrates, and exactly what Maison Jearom has been implementing since day one.
Performance and rigorous formulation are not opposing forces. They reinforce each other.
Ready to make a difference in 5 days?
"The freedom to be proud of your hair and its power, the duty to respect your health and your planet."
This phrase summarizes what Maison Jearom has championed since its creation: hair beauty should never come at the expense of your health, or that of the planet. The Inserm study has scientifically proven it: changes in habits have a rapid and measurable impact. You don't need a radical transformation. Just better formulas, and fewer products.
