Is Your Sunscreen Safe During Pregnancy? What You Need to Know About Oxybenzone and Chemical UV Filters

Pregnancy is one of the most remarkable — and vulnerable — seasons in a woman's life. Your body is doing something extraordinary, and everything you put on your skin during this time matters more than usual. Sunscreen is no exception.

Most people assume that if a product is on the shelf, it's been thoroughly vetted for safety during pregnancy. But the reality is more complicated — and when it comes to one common sunscreen ingredient in particular, the research raises some serious questions.

Should I wear sunscreen when pregnant?

During pregnancy, hormonal changes make the skin significantly more sensitive to UV radiation, increasing the risk of sunburn, hyperpigmentation, and lasting skin damage. Conditions like melasma — often called the "mask of pregnancy" — are directly triggered by sun exposure combined with elevated hormone levels. So keeping up with sun protection during pregnancy isn't vanity; it's genuinely important for skin health.

The problem is that not all sunscreens are equally safe to use when you're pregnant. Some of the most common UV-filtering chemicals have been shown to penetrate the skin, enter the bloodstream, and cross the placental barrier — raising real concerns about their effects on a developing baby.

Are chemical sunscreens safe during pregnancy?

Chemical sunscreens work by absorbing UV radiation and converting it into heat. To do this, they rely on synthetic UV filters — ingredients like oxybenzone, octinoxate, avobenzone, and homosalate. These filters are effective at preventing sunburn, but they don't just sit on the surface of the skin.

Studies have found that these UV filters can penetrate the skin and enter the bloodstream, where they can accumulate over time and be detected in urine, amniotic fluid, and breast milk. That means when a pregnant woman applies a chemical sunscreen, trace amounts of these ingredients can reach the baby.

Many of these UV filters are also classified as endocrine-disrupting chemicals — substances that can mimic or interfere with the body's natural hormone functions, particularly oestrogen and progesterone, which are critical to a healthy pregnancy. This is especially concerning during fetal development, when the hormonal environment plays a direct role in how organs and systems form.

Is Oxybenzone in sunscreen dangerous during pregnancy?

Of all the chemical UV filters found in conventional sunscreens, Oxybenzone (also listed as Benzophenone-3) raises the most concern during pregnancy. It has an EWG safety rating of 8 out of 10, and for good reason.

Oxybenzone has been shown to mimic oestrogen, has been detected directly in fetal and umbilical cord blood, and animal studies have shown underweight fetuses and disrupted hormone development following early pregnancy exposure. Because Oxybenzone can stay in the body for weeks after a single application, the exposure isn't brief or incidental — it builds up.

Perhaps most alarmingly, oxybenzone has been linked to an increased risk of Hirschsprung's disease — a serious congenital condition affecting the nerve cells of the bowel, which typically requires surgery in newborns. Research published in the Journal of Exposure Science found higher levels of oxybenzone in the urine of pregnant women whose babies were later diagnosed with the condition. As researcher Joe Dinardo from Haereticus Environmental Laboratory put it:

"A pregnant woman who follows the instructions for the recommended use of sunscreen products containing 6% oxybenzone could have concentrations of oxybenzone reach as high as 3,800 parts per billion in the woman, and 384 parts per billion in the fetus — concentrations that can potentially cause toxic cellular changes and give rise to Hirschsprung's Disease."

Given these findings, experts increasingly recommend that pregnant women — and those trying to conceive — avoid sunscreens containing oxybenzone entirely.

Which sunscreen ingredients should I avoid when pregnant?

Oxybenzone is the most well-documented concern, but it isn't the only one. Here's a broader list of ingredients worth avoiding during pregnancy:

Chemical UV filters to avoid:

• Oxybenzone — linked to hormone disruption, detected in amniotic fluid, breast milk, and fetal blood, and associated with Hirschsprung's disease in newborns.
• Octinoxate (Ethylhexyl Methoxycinnamate) — can mimic oestrogen and potentially interfere with pregnancy hormones; detected in breast milk.
• Avobenzone — may degrade in sunlight and form harmful byproducts; often paired with stabilisers that carry their own concerns.
• Homosalate — shown to accumulate in the body and disrupt hormone regulation; not recommended for pregnant women.
• Octocrylene — can break down into benzophenone, a potential carcinogen and endocrine disruptor.

Other ingredients to avoid in skincare during pregnancy:

• Parabens (methylparaben, propylparaben, butylparaben, or anything ending in -paraben) — can mimic oestrogen and may impact fetal development.
• Retinoids (retinol, retinyl palmitate, retinoic acid) — excessive vitamin A intake is linked to birth defects.
• Phthalates — commonly hidden in synthetic fragrances; can disrupt reproductive hormones.
• Hydroquinone — a skin-lightening agent that absorbs into the body at high rates.

For a full breakdown of these and other ingredients to be aware of, see our guide to toxic sunscreen ingredients to avoid.

What is the safest sunscreen to use when pregnant?

The good news is that you don't have to choose between protecting your skin and protecting your baby. Mineral sunscreens — particularly those formulated with Non-Nano Zinc Oxide — offer a genuinely safe alternative.

Unlike chemical UV filters, zinc oxide sits on the surface of the skin rather than penetrating it. It doesn't enter the bloodstream, doesn't mimic hormones, and is one of only two UV filters the FDA classifies as generally recognised as safe and effective — even for use by pregnant women and infants. It also provides true broad-spectrum UVA and UVB protection and works from the first moment of application.

When choosing a mineral sunscreen during pregnancy, look for:

• Non-Nano Zinc Oxide as the only active UV filter
• No chemical UV filters — always check the ingredient list
• No parabens, phthalates, or synthetic fragrances
• Organic, gentle base ingredients — oils, butters, and waxes rather than synthetic additives

Two apps that make ingredient checking much easier are Yuka — which lets you scan a product barcode for an instant safety rating — and INCI Beauty, which gives detailed ingredient-by-ingredient breakdowns.

All Suntribe sunscreens are formulated with Non-Nano Zinc Oxide as the only UV filter, contain no chemical UV filters or parabens, and are made with certified organic ingredients. For a full guide to navigating sun protection during pregnancy, including tips on skin sensitivity and hyperpigmentation, see our ultimate guide to choosing a pregnancy-safe sunscreen.

The bottom line

Protecting your skin from UV damage during pregnancy is important — but so is knowing what's in your sunscreen. Many of the most common chemical UV filters have been shown to cross into the bloodstream, reach the baby, and interfere with hormones at a time when hormonal balance is everything. Oxybenzone in particular carries a growing body of evidence linking it to fetal harm, including an increased risk of Hirschsprung's disease.

The simplest, most evidence-backed approach is to switch to a mineral sunscreen with Non-Nano Zinc Oxide for the duration of your pregnancy — and ideally while trying to conceive too. Sun protection shouldn't be a source of worry during pregnancy. With the right product, it doesn't have to be.