Is brow lamination safe during pregnancy?

What does the evidence say about brow lamination during pregnancy?

1. MotherToBaby's guidance on cosmetic exposures during pregnancy takes a consistent approach to spa and salon services without dedicated pregnancy research, which includes brow lamination: discuss any procedure you're considering with your prenatal provider rather than assuming it's automatically fine or automatically risky. 1
2. Thioglycolate, the family of chemicals used in brow lamination and hair perms, works by selectively breaking the cystine bonds that hold hair's keratin structure in shape and then reforming those bonds once the hair is set into a new shape. It maintains about 90% of the hair's original cystine content, and the reaction happens within the hair fiber itself. 2
3. In toxicology testing, pregnant rats given sodium thioglycolate on the skin daily through much of gestation at doses up to 200 milligrams per kilogram showed lower body weight gain and lower fetal weight only at that highest dose, with no fetal structural abnormalities found at any dose tested. 3
4. The same toxicology testing in pregnant rabbits found skin irritation at the application site but no effect on fetal development or survival, even at daily doses up to 65 milligrams per kilogram. 3
5. Indoor air quality testing in beauty salons has found volatile organic compound levels ranging from about 100 to 1,450 micrograms per cubic meter depending on ventilation and how many chemical services are performed, though that reflects a technician's repeated full-shift exposure rather than a single client visit for one quick brow session. 4

Is brow lamination safe in each trimester?

• First trimester. Some salons decline brow lamination in the first trimester as a precaution, not because of documented evidence of harm this early; it's the same conservative policy many spas apply to any chemical service in early pregnancy. If your salon is comfortable, there's nothing brow-lamination-specific pointing to added first-trimester risk.
• Second trimester. Many people find the second trimester the easiest window to book, once early nausea has eased and salons that paused chemical services in the first trimester are often comfortable proceeding.
• Third trimester. Lying back for the 20 to 45 minutes a lamination takes can feel harder late in pregnancy. Ask for extra pillows or a slight recline rather than lying fully flat, and speak up if you feel lightheaded.