Cancer-Causing Chemicals in Your Shampoo? Here’s What This New Study Found
Breaking News — May 8 2025: A new study published in Environmental Science & Technology Letters sampled the weekly beauty routines of 64 Black and Latina women in Los Angeles. More than 53 % of the products they logged — from shampoos and body lotions to eyelash glue — contained formaldehyde or formaldehyde-releasing preservatives (FRPs).

Why does it matter? Formaldehyde is a known human carcinogen and has been banned from European cosmetics since 2009, yet it remains legal in the U.S. Repeated, low-level exposure can build up over time, raising risks for cancers as well as skin and respiratory irritation.
Key Numbers at a Glance
- 47 % of skincare and 58 % of hair-care items in the study carried FRPs.
- Participants used an average of 17 different products a day — one woman logged 43!
- Common “hidden” ingredient names: DMDM hydantoin, imidazolidinyl urea, quaternium-15.
“We shouldn’t have to be chemists to stay healthy.” — Janette Robinson Flint, study co-author
Disproportionate Impact on Women of Color
The researchers focused on Black and Latina communities because previous investigations found higher formaldehyde exposures linked to hair-straightening products and colorism-driven beauty standards. Social pressure to conform to Eurocentric hair norms means systemic racism literally shows up on the ingredient label.
What This Means for Your Brow or PMU After-Care
Freshly microbladed skin is especially vulnerable to irritants. Formaldehyde-releasing cleansers or lotions can:
- Prolong redness or swelling
- Interfere with pigment retention
- Increase overall toxic burden during healing
Good news: Safe swaps exist. We keep every Ellebrow after-care kit formaldehyde-free, and our studio carries vetted products you can trust.
If you care about hidden toxins, check your SPF too.
Next Step → Dive Deeper
Feeling overwhelmed by label lingo? Read our in-depth guide to spotting formaldehyde and choosing safer products →
Is formaldehyde always listed by name?
No. Most products hide it behind longer chemical names (see list above). That’s why the new guide includes a printable cheat sheet for your next shopping trip.
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