Alpha hydroxy acids (AHAs) are generally considered safe to use during pregnancy, with some important limits on concentration and product type. The most common AHAs in skincare, glycolic acid and lactic acid, have minimal absorption through the skin, which is the primary reason they get a favorable safety profile for pregnant users. That said, the details matter: what’s fine in a daily serum may not be fine in a professional-strength peel.
What the Safety Evidence Shows
AHAs carry a Category B classification from the US FDA, meaning animal studies have not shown risk to a fetus and there are no adequate human studies confirming harm. The key safety guideline is to keep concentrations at 10% or below, with a product pH above 3.5. At these levels, very little of the acid reaches your bloodstream. Most over-the-counter AHA serums, toners, and moisturizers fall well within this range.
Glycolic acid specifically has not been formally classified by the FDA into a pregnancy risk category, but it is still considered safe due to its minimal systemic absorption. The American Academy of Dermatology includes glycolic acid among its recommended ingredients for pregnant people dealing with skin discoloration, suggesting it as part of an evening skincare routine.
How Much Actually Gets Into Your Body
The reason AHAs get a pass during pregnancy comes down to absorption. In lab studies using human skin, a 5% glycolic acid solution at pH 3.0 (the most acidic formulation tested) resulted in only about 2.6% of the product reaching the receptor fluid, a stand-in for the bloodstream. At a more neutral pH of 7.0, total absorption dropped from 27% to just 3.5%, with almost none making it past the skin layers themselves.
Lactic acid behaves similarly, with about 3.6% reaching the receptor fluid under the same low-pH conditions. These are small numbers, and in real-world use with properly formulated products (pH above 3.5, concentration at 10% or less), the amount entering your system is minimal. This is a stark contrast to ingredients like retinoids, which are absorbed in meaningful amounts and are clearly contraindicated during pregnancy.
Over-the-Counter Products vs. Professional Peels
The safety picture changes when you move from daily-use products to professional treatments. Glycolic acid and lactic acid peels performed in a dermatologist’s office are still considered safe during pregnancy, according to a review published in the International Journal of Women’s Dermatology. However, other types of chemical peels, particularly those using trichloroacetic acid or high-concentration salicylic acid, should be avoided or used with extreme caution.
The distinction comes down to concentration and depth of penetration. A 5-8% glycolic acid serum you apply at home barely reaches your deeper skin layers. A 30-70% professional peel penetrates much further, and while glycolic and lactic acid versions are still on the “generally safe” list, the margin for error is smaller. If you’re considering a professional peel during pregnancy, it’s worth having that specific conversation with your provider rather than assuming all peels carry the same risk.
Which AHAs Are Safest
Not all alpha hydroxy acids absorb at the same rate. Glycolic acid and lactic acid, the two most common in consumer products, have the lowest absorption rates. Longer-chain AHAs tell a different story. In the same lab studies, a compound called 2-hydroxy-octanoic acid had 15.4% of the product reach the receptor fluid, roughly four to six times the absorption of glycolic or lactic acid. These longer-chain acids are rarely found in mainstream skincare, but it’s worth checking ingredient lists if you’re using niche or professional-grade products.
Your safest choices during pregnancy:
- Glycolic acid at 10% or below, the most widely studied AHA in pregnancy
- Lactic acid at 10% or below, similarly low absorption
- Mandelic acid, another common AHA with a larger molecular size that limits penetration
Why Pregnancy Skin Benefits From AHAs
Pregnancy triggers a surge in hormones that can darken patches of skin, a condition called melasma or “the mask of pregnancy.” Many of the go-to treatments for hyperpigmentation, like retinoids and hydroquinone, are off-limits during pregnancy. AHAs fill that gap. They work by loosening the bonds between dead skin cells on the surface, speeding up cell turnover and gradually fading dark patches.
The AAD recommends pairing a vitamin C product in the morning with a glycolic acid product in the evening as a pregnancy-safe approach to treating and preventing skin discoloration. AHAs also help with the acne flare-ups many people experience during pregnancy, offering gentle exfoliation without the risks associated with higher-dose salicylic acid (above 2%) or prescription acne treatments.
Sun Sensitivity Matters More Now
AHAs make your skin more sensitive to UV light regardless of whether you’re pregnant. During pregnancy, your skin is already more prone to darkening and pigmentation changes, so adding an exfoliating acid without sun protection can worsen the exact problems you’re trying to treat. Any AHA routine during pregnancy should include daily sunscreen. Mineral sunscreens using zinc oxide or titanium dioxide are the standard recommendation for pregnant people, since these ingredients sit on top of the skin rather than being absorbed.
What to Avoid Alongside AHAs
The bigger concern during pregnancy isn’t usually AHAs themselves but the other active ingredients in the same product. Many anti-aging and acne serums combine glycolic acid with retinol, salicylic acid above 2%, or other ingredients that aren’t considered safe during pregnancy. Read the full ingredient list rather than just looking for “glycolic acid” on the front label.
Salicylic acid (a beta hydroxy acid, not an AHA) is a common companion ingredient. At concentrations of 2% or below, it’s typically considered acceptable. Above that threshold, or in the form of a professional peel, it falls into the “use with caution or avoid” category. If your product contains both glycolic acid and salicylic acid, check that the salicylic acid stays at or below 2%.