Brow lamination during pregnancy hasn’t been studied enough to declare it definitively safe or unsafe, but there are real reasons for caution. The treatment uses chemicals like thioglycolic acid and ammonium compounds to reshape brow hairs, and pregnancy changes how your skin absorbs and reacts to those chemicals. Most brow professionals recommend avoiding the treatment during the first trimester at minimum, and many suggest waiting until after pregnancy entirely.
What Chemicals Are Involved
Brow lamination is essentially a perm for your eyebrows. The process uses a lifting solution (typically containing thioglycolic acid or ammonium thioglycolate) to break down the bonds in your brow hairs, reshape them into place, then set them with a neutralizing solution. These are the same types of chemicals used in hair perms and relaxers.
Data from the European Commission’s Scientific Committee on Consumer Safety shows that less than 1% of ammonium thioglycolate applied to skin is absorbed systemically, about 0.77% in controlled testing. That’s a small amount, and brow lamination covers a much smaller area than a full head of hair. However, pregnancy changes the equation in ways that matter.
Why Pregnancy Changes the Risk
Pregnancy hormones make your skin more permeable. Research into prenatal physiology suggests skin permeability can increase by 40 to 50% during pregnancy, which means your body may absorb more of whatever is applied to it. On top of that, your immune system becomes more reactive, making you significantly more prone to contact dermatitis. A product you’ve used comfortably for years can suddenly cause redness, swelling, or chemical burns around the delicate eye area.
This heightened sensitivity creates a practical problem beyond the chemical exposure itself. If you do have an allergic reaction or chemical burn during pregnancy, your treatment options are limited. Many antihistamines and topical antibiotics are restricted during pregnancy and breastfeeding, so a reaction that would normally be easy to manage becomes much harder to treat.
The chemical fumes are another consideration. Brow lamination solutions produce odors that can be unpleasant or irritating to inhale, and pregnancy often intensifies sensitivity to smells. While the exposure is brief, it adds to the overall picture of why many professionals err on the side of skipping it.
Results May Be Unpredictable
Even setting safety aside, you may not get the results you’re paying for. Hormonal fluctuations during pregnancy change your hair’s structure and growth cycle in ways that make brow lamination unreliable. Some women find the lift simply doesn’t hold because increased oil production creates a barrier that prevents the solution from penetrating the hair shaft. Others experience the opposite problem: pregnancy makes hair drier and more porous, so it over-processes faster than expected, leading to brittle, damaged brow hairs or breakage.
Technicians report that processing times become unpredictable with pregnant clients. The standard timing that works perfectly on non-pregnant clients can either do nothing or cause over-processing, and there’s no reliable way to predict which direction it will go. This is why many experienced brow artists recommend against performing lamination on someone who hasn’t had the treatment before becoming pregnant. If there’s no baseline for how your brows typically respond, the risk of a poor outcome goes up considerably.
Trimester-by-Trimester Considerations
The first trimester carries the most concern. This is the period of the most rapid fetal development and when chemical exposures raise the greatest theoretical risk. Elleebana, one of the major manufacturers of lamination products, specifically recommends avoiding the treatment during the first trimester due to the possibility of stronger reactions to the chemicals or their odors.
During the second and third trimesters, some women do choose to get brow lamination after discussing it with their healthcare provider. The risk of systemic absorption remains very low in absolute terms, and the treatment area is small. But the skin sensitivity and unpredictable results issues persist throughout pregnancy and into breastfeeding. There’s no trimester where these concerns fully disappear.
Safer Alternatives During Pregnancy
If you want polished brows without the chemical processing, you have options that carry essentially no risk:
- Brow gel or soap brows: A clear or tinted brow gel can mimic the lifted, brushed-up look of lamination without any chemicals touching your skin.
- Brow threading or tweezing: Shaping through hair removal is purely mechanical and involves no chemical exposure.
- Tinted brow products: Pencils, powders, and pomades let you fill in and define your brows daily without any absorption concerns.
If you do decide to go ahead with lamination after the first trimester, a patch test 48 hours beforehand is essential. Your skin’s reactivity during pregnancy can be dramatically different from what you’re used to, and a small test area near your brow can reveal sensitivity before a full application causes a painful reaction around both eyes.