Class-action lawsuit filed against shampoo brand Tresemmé claims keratin products cause hair loss


A view of TRESemme products on display backstage at TRESemme x Oscar de la Renta during NYFW on February 10, 2020 in New York City.

In November, a nationwide class action lawsuit was filed against beauty conglomerate Unilever alleging some of its Tresemmé products allegedly caused hair loss.

“The plaintiff bought the products because of Unilever’s consistent misrepresentation that the products would straighten her hair and coat it with keratin, a protein found naturally in hair,” the lawsuit said. “The products contain an ingredient or combination of ingredients which, when used properly, cause significant hair loss and / or irritation to the scalp.”

One ingredient, a formaldehyde-releasing preservative DMDM-hydantoin, was found in Tresemmé Keratin Hair Smoothing Shampoo and TRESemme Keratin Smooth Color Shampoo.

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According to, DMDM ​​hydantoin is a preservative in cosmetics and personal care products that slows and prevents spoilage in products such as shampoos and hair conditioners, as well as in skin care products such as moisturizers and makeup foundations.

And according to the website, the product is considered safe.

“As a cosmetic ingredient, DMDM ​​hydantoin is currently safe for normal use in products, according to scientific experts from the European Union’s Cosmetics Directive and an independent body that reviews cosmetic ingredients,” wrote ChemicalSafetyFacts. “To put the formaldehyde exposure of DMDM ​​hydantoin in personal care products in perspective, the small amount of formaldehyde released by a formaldehyde dispenser when you wash your hair is roughly the same as the amount of formaldehyde found naturally in a medium-sized apple or of a pear. “

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However, the lawsuit alleges that formaldehyde has harmful reactions when absorbed into the skin.

“Formaldehyde is a known human carcinogen that, if absorbed into the skin, can cause cancer and other harmful reactions. DMDM ​​hydantoin has been used as a preservative in Unilever products for more than a decade. However, the use of DMDM ​​hydantoin as a preservative is one Preservatives. ” A completely unnecessary risk as there are several safer natural alternatives. Therefore, as over-the-counter hair straightening shampoo products, the products become dangerous and unsafe for sale, “the lawsuit said.

The lawsuit alleges that defendants failed to properly warn consumers of the risks and dangers of using the ingredient on their hair and scalp “even after defendants knew or should have known about the dangers of the products.”

This is not the first time that the safety of the ingredient DMDM ​​hydantoin has been questioned.

The lawsuit mentioned that Suave, also owned by Unilever, recalled its keratin infusion products in 2012 because of ailments causing hair loss and irritation. The line contained the ingredient DMDM ​​hydantoin.

“Although Unilever has been publicly aware since at least 2012 that DMDM ​​hydantoin, as a formaldehyde donor, can cause or contribute to hair loss and scalp irritation, Unilever has proudly continued to include this ingredient in its products as a preservative and even goes so far as to represent DMDM ​​to the public -Hydantoin is safe for use in its hair care products, “the lawsuit says.

The class action lawsuit gained significant momentum on social media platforms in November and December after several videos were released focusing on the claims.

In addition, several class action lawsuits were filed against DevaCurl over the past year for hair loss and other adverse effects.

Tresemmé did not immediately respond to FOX Television Stations’ request for comment.

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