The FDA has been trying to ban formaldehyde in keratin and hair-smoothing treatments since warnings first surfaced between 2010 and 2016. As of early 2026, it still hasn’t finalized that rule — missing its own proposed deadline again. If you’ve booked (or are considering) a keratin treatment, here’s what the actual health data says, and which specific salon formulas carry the most risk.
What’s Actually in a Keratin Treatment
Many keratin and hair-smoothing treatments work by releasing formaldehyde gas or a formaldehyde-releasing compound during the heat-styling step, which is what straightens and smooths the hair shaft. Salons and manufacturers have marketed “formaldehyde-free” alternatives for years, but testing has repeatedly found some of these still release formaldehyde at levels above what’s considered safe — the label alone isn’t a reliable guarantee.
What the Health Data Actually Shows
Formaldehyde exposure from these treatments is documented to cause eye, nose, and throat irritation, coughing, and allergic reactions in both clients and the stylists repeatedly exposed to it. The more serious finding is more recent: a 2022 NIH-funded study found that women who used chemical hair straighteners four or more times a year were more than twice as likely to develop uterine cancer compared to women who didn’t use them, with the elevated risk found to be more pronounced among Black women, who use these products at higher rates. That finding prompted litigation against L’Oréal and other manufacturers, and it’s a meaningfully different risk category than the irritation and allergy concerns that first drove the FDA’s attention to this category back in 2010.
Which Specific Products Carry the Highest Risk
Not every keratin treatment carries equal formaldehyde exposure. Brazilian Blowout Solution’s original formula has tested at roughly 12% methylene glycol — a formaldehyde-releasing compound — which is about triple the formaldehyde content of most other keratin treatments on the market. Cadiveu Brazilian Thermal Reconstruction, Coppola Keratin, and QOD GOLD Solution have also been named among the higher-formaldehyde formulas by health researchers tracking this category. Lower-formaldehyde or genuinely formaldehyde-free reformulations do exist and are increasingly common, but they aren’t universal across the category, and product names alone don’t reliably indicate which tier a given treatment falls into.
Why the FDA Ban Keeps Getting Delayed
The proposed ban has been in some stage of the regulatory process since roughly 2016, and as of January 2026 it remained unfinalized — a delay confirmed across multiple independent outlets covering the story this year. The exact bureaucratic reasons for the repeated delay aren’t fully public, but the practical effect for consumers is straightforward: there is currently no federal restriction on formaldehyde levels in these treatments, which means the burden of avoiding higher-risk formulas falls on the person booking the appointment, not on a regulatory floor everyone in the industry has to meet.
How to Actually Check Before You Book
A few concrete steps reduce exposure risk without requiring a chemistry background. Ask the salon directly which specific product line they use and whether they can show you the product’s safety data sheet, which lists formaldehyde or methylene glycol content. Favor salons with strong ventilation and separate treatment rooms, since airborne exposure during the heat-activation step is a real part of the risk, for stylists especially. If you’re pregnant, trying to conceive, or have respiratory sensitivities, this is a category worth discussing with a doctor before booking rather than after a reaction. And frequency matters independent of formula — the uterine cancer research specifically flagged four-or-more-times-a-year use, so spacing treatments out further reduces cumulative exposure regardless of which product a salon uses.
It’s Not Just a Client Risk
Much of the coverage of this issue focuses on the person getting the treatment, but stylists face the highest cumulative exposure by a wide margin — they’re present for the heat-activation step of multiple treatments per day, week after week, for years. Occupational health researchers have flagged this repeatedly as a bigger exposure concern than any single client appointment, which is part of why some states and salon chains have moved to restrict or phase out the highest-formaldehyde formulas independently of federal action. If you’re a stylist reading this rather than a client, the same questions about product formulation apply, plus ventilation standards and personal protective equipment in your specific workspace — and it’s worth knowing that regulatory delay at the federal level doesn’t mean your salon or state has no applicable rules at all.
What “Formaldehyde-Releasing” Actually Means Chemically
Formaldehyde exposure from these treatments rarely comes from formaldehyde being added directly to the bottle — it’s more often released from a related compound, most commonly methylene glycol, when the product is heated with a flat iron during application. This is exactly why a product can legally list ingredients that don’t say “formaldehyde” anywhere on the label while still releasing it in meaningful amounts once a stylist starts using heat. It’s a genuine regulatory gray area, and it’s a large part of why “formaldehyde-free” claims have been inconsistent in independent testing — a product can be formaldehyde-free in the bottle and not formaldehyde-free once heat is applied.
Frequently Asked Questions
Are all keratin treatments equally risky?
No. Formaldehyde content varies significantly by brand and formula, with some products testing at roughly triple the level of others. Asking a salon directly which product line they use is more informative than assuming based on marketing language.
Does “formaldehyde-free” labeling mean a treatment is actually formaldehyde-free?
Not reliably. Testing has found some products labeled formaldehyde-free still release formaldehyde during the heat-styling process, so the label is a starting point for questions, not a guarantee on its own.
Is one keratin treatment a year a real health risk?
The specific research finding elevated uterine cancer risk focused on four-or-more-times-a-year use over time, so occasional use sits in a different risk category than frequent use — though the irritation and allergy risks can occur with any exposure level.
Final Thoughts
The FDA’s repeated delay doesn’t mean the underlying safety questions have been resolved — it means the regulatory floor hasn’t caught up to research that’s been accumulating since 2010. Until it does, knowing which formulas carry the highest formaldehyde content, and how often you’re actually getting the treatment, does more to manage the real risk than waiting on a rule that keeps missing its own deadline.
For a cost breakdown of keratin treatments alongside this safety context, see our guide on how much a keratin treatment actually costs on gemifys.com.
