Lash lifts are not known to be harmful during pregnancy, but there’s no definitive safety data either. The chemicals involved are applied in small amounts for a short time, and absorption through the skin is minimal. The bigger practical concerns are heightened skin sensitivity during pregnancy, unpredictable results due to hormonal changes, and the physical discomfort of lying flat on your back in the later trimesters.
What the Chemicals Do and How Much Gets Absorbed
Lash lift solutions work by breaking the bonds that give your lash hairs their natural shape, then resetting them into a curled position. The most common active ingredients are thioglycolic acid, ammonium thioglycolate, and cysteamine. These are the same types of chemicals found in hair removal creams and traditional perms.
There’s no specific research measuring how much of these chemicals enters the bloodstream when applied to the eyelids. However, MotherSafe, a clinical advisory service run by the Royal Hospital for Women in Australia, has evaluated thioglycolic acid in cosmetic products and notes that because the concentration is low and the application time is short, it “would not be anticipated to be harmful in pregnancy.” This assessment was made for hair removal creams, which cover a larger skin area than the tiny amount applied to your lashes.
The lack of direct studies means no one can guarantee zero risk, but the exposure is genuinely small. A lash lift applies a thin layer of solution to a small patch of skin for roughly 10 to 15 minutes. Compare that to a full head of hair being chemically permed or a depilatory cream spread across your legs.
Gentler Formulations to Consider
Not all lash lift products are identical. Traditional thioglycolic acid formulas are the strongest, producing the most dramatic curl, but they also carry the highest risk of overprocessing or triggering sensitivity reactions. Cysteamine-based formulas operate at a lower pH and are generally considered the gentlest option, with the lowest risk of adverse skin reactions. If you’re pregnant and leaning toward getting a lash lift, asking your technician which formulation they use is worth the conversation.
Keratin-infused lash lifts combine the curling process with conditioning proteins that penetrate the hair shaft. These formulas are designed to reduce breakage and leave lashes in better condition after treatment. While “keratin lash lift” sounds like a fundamentally different process, the lifting mechanism still relies on one of the same bond-breaking chemicals. The keratin is an added conditioning step, not a replacement for the active ingredient.
Why Results May Be Unpredictable
Even if the safety profile doesn’t concern you, the results might disappoint. Pregnancy hormones change your hair in ways that affect how well a lash lift holds.
During pregnancy, elevated estrogen keeps hair follicles in their active growth phase longer than usual. This often means thicker, fuller lashes, which sounds like a bonus. But the same hormonal environment can change lash texture and make the hairs respond differently to chemical processing. Some women find their lash lift doesn’t curl as well as expected, while others find the results are more dramatic than intended. Your technician can’t fully predict the outcome because your hair’s baseline has shifted.
After delivery, estrogen drops sharply and many of those lashes that were held in the growth phase enter the shedding phase all at once. Postpartum lashes commonly become thinner, more brittle, shorter, and slower to regrow. A lash lift done late in pregnancy may look great for a week or two and then fall apart as those lashes shed in the postpartum period.
The Problem With Lying Flat
A lash lift typically requires you to lie on your back with your eyes closed for 45 minutes to over an hour. In the first trimester, this is generally fine. From about 20 weeks onward, it becomes a real concern.
When a pregnant person lies flat on their back in the second half of pregnancy, the weight of the uterus compresses major blood vessels against the spine. This can reduce the heart’s output by 25% to 30%. Up to 15% of women at full term experience what’s called supine hypotensive syndrome: a significant drop in blood pressure that causes dizziness, nausea, sweating, weakness, and sometimes fainting. Symptoms can appear within 3 to 10 minutes of lying down.
The standard medical recommendation for pregnant people past 20 weeks is to avoid lying flat on their back. A 15 to 30 degree tilt to the left side, achieved by placing a wedge under the right hip, is enough to shift the uterus off those blood vessels and prevent the problem. If you’re in your second or third trimester and still want a lash lift, ask the salon whether they can position you with a wedge or pillow under your right hip. Some salons accommodate this, but many don’t have the setup for it, and any significant movement during the procedure can affect the results.
Skin Sensitivity During Pregnancy
Pregnancy increases blood flow to the skin and shifts immune function in ways that can make you more reactive to products you previously tolerated without issue. Contact irritation and allergic reactions to cosmetic chemicals are more common during pregnancy. The skin around your eyes is already the thinnest on your body, making it especially vulnerable.
If you’ve had lash lifts before pregnancy with no problems, that doesn’t guarantee the same experience now. A patch test 24 to 48 hours before the full treatment is a reasonable precaution. This involves applying a small amount of the lifting solution to a discreet area of skin to check for redness, swelling, or itching before committing to the full procedure near your eyes.
Practical Considerations if You Decide to Go Ahead
Many lash technicians will perform lifts on pregnant clients, and many won’t. Those who decline aren’t necessarily doing so because the treatment is dangerous. They’re often protecting themselves from liability in a situation where no clear safety data exists. If a technician turns you down, it’s not a red flag about the procedure itself.
If you do book an appointment, a few things can make the experience safer and more comfortable. Choose a well-ventilated salon, since pregnancy often heightens sensitivity to chemical fumes and strong smells. Schedule the appointment earlier in pregnancy when lying flat is still comfortable and hormonal changes haven’t yet peaked. Ask about the specific formulation being used and opt for a cysteamine-based product if available. And if you’re past 20 weeks, confirm that the salon can position you with a left-side tilt rather than completely flat.
Some women choose to skip lash lifts entirely during pregnancy and use a heated lash curler instead for a temporary curl with no chemical exposure. Others wait until well after the postpartum shedding phase has passed, typically around six months after delivery, so the treatment is applied to lashes that are in a stable growth cycle and more likely to hold the results.