Formaldehyde-free hair-straightening merchandise have gained recognition as a probably safer choice than their formaldehyde-containing counterparts — however a brand new collection of medical circumstances calls the protection of those different merchandise into query.
Formaldehyde — in addition to liquid types of the chemical, known as formalin and methylene glycol — is added to hair-straightening and hair-smoothening merchandise as a preservative to increase shelf life and to help lock the hair’s texture in place for a very long time.
However, in recent years, various countries have moved to ban the chemical from hair-straightening products due to health concerns.
When heated, as it is during these hair treatments, formaldehyde is released into the air as a gas. This can cause immediate problems, such as skin irritation, coughing, wheezing and a burning sensation in the eyes. But especially when it happens repeatedly, formaldehyde exposure can also cause long-term issues such as fertility problems, asthma and a raised danger of most cancers, comparable to leukemia and nasopharyngeal cancers.
Given these points, formaldehyde-free variations of those merchandise are sometimes touted as safer choices. However that does not imply they’re innocent, in accordance with the brand new case collection, revealed Aug. 28 within the journal Clinical Toxicology. Particularly, the report highlights a possible danger of kidney harm tied to glyoxylic acid, an ingredient discovered in lots of formaldehyde-free hair-straightening merchandise that serves as a straightening agent.
The report particulars the circumstances of 13 girls and teenagers who have been handled on the Sourasky Medical Middle in Tel Aviv following publicity to formaldehyde-free hair-straightening merchandise. The sufferers started feeling ailing inside two to 72 hours of present process these hair-straightening remedies at varied salons.
“Even earlier than these research have been revealed,” the examine authors wrote, “our medical toxicology service had begun to obtain comparable studies, prompting us to go to native hair salons, together with unlawful salons talked about by affected sufferers, the place we found the presence of glyoxylic acid within the hair-straightening merchandise.”
The 13 sufferers, who ranged from 15 to 53 years previous, developed signs comparable to vomiting, stomach ache and scalp rashes. Twelve of the sufferers developed acute kidney harm, as evidenced by a buildup of the waste product creatinine of their blood, a lower in urine output and the presence of small crystals within the urine they did expel.
The one one that did not develop kidney harm had obtained remedy in a short time — they have been admitted to the hospital simply six hours after their hair remedy, and inside two hours of admission obtained thiamine and pyridoxine, that are B nutritional vitamins thought to assist the physique break down glyoxylic acid.
Along with discovering glyoxylic acid-containing merchandise on the salons their sufferers visited, the medical middle’s toxicology group additionally discovered that a few of the salons had insufficient air flow.
The sufferers stayed within the hospital for between one and 10 days. Not one of the sufferers required their blood to be filtered with hemodialysis and no deaths occurred.
It’s price noting that the case collection included comparatively few sufferers, did not embrace any kidney biopsies and was partly performed retrospectively, because the authors appeared again at circumstances that befell between April 2021 and March 2025. Nonetheless, this is not the primary time glyoxylic acid has been linked to kidney points. Hair merchandise containing the ingredient have been tied to kidney accidents in anecdotal reports and in a single girl’s case of repeated kidney damage, for instance.
“These findings spotlight a probably underrecognized danger of kidney toxicity related to glyoxylic acid-containing hair merchandise,” the authors concluded. “Immediate recognition and early remedy, significantly with thiamine and pyridoxine, might cut back the severity of kidney harm. Additional research and regulatory motion are wanted to raised outline the chance and stop future circumstances.”
In the meantime, within the U.S., the Meals and Drug Administration (FDA) appeared poised to ban formaldehyde in hair-straightening and hair-smoothing products again in April 2024. Nonetheless, the proposed ruling was postponed a number of occasions in 2024, and the trouble has not progressed in 2025. For now, the FDA simply discourages consumers from buying and utilizing hair merchandise containing formaldehyde or associated substances.
Some consultants have mentioned that glyoxylic acid also needs to be banned from hair-straightening and smoothening merchandise, however no strikes have been made on that entrance.
This text is for informational functions solely and isn’t meant to supply medical recommendation.
