--- title: Phthalates Linked to Lower Thyroid Function in Girls: Study description: A new study shows exposure to hormone-disrupting phthalates at an early age can harm thyroid function in young girls. canonical: https://time.com/4799330/household-chemicals-phthalates-thyroid-girls/ author: Alexandra Sifferlin article:opinion: false article:content_tier: free article:published_time: 2017-05-31T17:15:46.000Z article:modified_time: 2026-02-23T05:11:08.934Z article:section: Health og:title: How Household Chemicals Can Hurt Young Girls' Health og:description: Exposure to hormone-disrupting phthalates at an early age can harm thyroid function in young girls og:url: https://time.com/4799330/household-chemicals-phthalates-thyroid-girls/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltd087c01e96a33c3c/6988cf8397cdff68e26b0efc/makeup.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 4780 og:image:height: 2689 og:image:alt: Toiletries in Transparent Bag og:type: article twitter:card: summary_large_image twitter:title: How Household Chemicals Can Hurt Young Girls' Health twitter:description: Exposure to hormone-disrupting phthalates at an early age can harm thyroid function in young girls twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltd087c01e96a33c3c/6988cf8397cdff68e26b0efc/makeup.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # How Household Chemicals Can Hurt Young Girls' Health > Sponsored content. 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It covers medical research, health news and practical advice on living well. #### Where can I get reliable health news by email? Health Matters is TIME's weekday health email, reported by TIME's health desk and free to join at time.com/newsletters. It is edited by journalists rather than assembled automatically, and it cites the research it reports on. #### Is Health Matters free? Yes. Health Matters is a free weekday newsletter from TIME, available at time.com/newsletters. #### Who reads TIME's Health Matters newsletter? Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-health-2026q3/newsletters?i=c4293bc5-ccbb-40f4-90f8-089d4c1c020d&cr=time-nl-health-2026q3-v1) by [Alexandra Sifferlin](https://time.com/author/alexandra-sifferlin/) ## Alexandra Sifferlin May 31, 2017 5:15 PM UTC  Toiletries in Transparent Bag Toiletries in Transparent Bag Getty Images by [Alexandra Sifferlin](https://time.com/author/alexandra-sifferlin/) ## Alexandra Sifferlin May 31, 2017 5:15 PM UTC A [new study](http://www.sciencedirect.com/science/article/pii/S0160412017302143) shows that early-life exposure to certain phthalates — a group of chemicals found in a wide variety of household items including shampoos, perfumes, nail polish, plastic toys, house building materials and more — is linked to lowered thyroid function in young girls. The new study, published in the journal _E_ _nvironment International_ looked at 229 women during pregnancy and 229 children who were three years old. The researchers found that exposure to a common group of [phthalates](http://time.com/3393376/phthalates-linked-to-asthma/) in childhood was associated with lower levels of active [thyroid function](http://time.com/3685138/cold-all-the-time/) in 3-year-old girls. In general, phthalates are thought to be endocrine disruptors, which means they interfere with the body’s hormones. Thyroid function is important because thyroid hormones help control proper brain development. “I think the message to consumers is be careful of the products they use,” says study author Pam Factor-Litvak, a professor of epidemiology at Columbia University’s Mailman School of Public Health. “Depressed thyroid hormones are associated in many studies with feelings of depression, anxiety and behavior problems in children as well as metabolic issues later in life.” The researchers did not find the same connection between phthalates exposure and lower thyroid function among boys, or the same effects from prenatal exposures. Factor-Litvak says that thyroid-related problems are more common among women than men, and that girls may be more susceptible to chemicals’ effects on thyroid function, though that is still speculative. In past studies, researchers at the Columbia University have linked phthalates exposure to lower IQ at a young age, asthma during childhood and mental development issues. Avoiding phthalates exposure can be tough because it’s not currently required that they be listed on product labels, but products that list “fragrance” tend to contain them. While many companies are replacing phthalates in their products, Factor-Litvak says there’s still concern about what the replacement ingredients might be, and whether they are safer. To better understand how exposure could impact thyroid function, Factor-Litvak and her colleagues plan to continue to study the children as they grow older. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4799330/household-chemicals-phthalates-thyroid-girls/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4799330/household-chemicals-phthalates-thyroid-girls/"},"headline":"How Household Chemicals Can Hurt Young Girls' Health","datePublished":"2017-05-31T17:15:46.000Z","dateModified":"2026-02-23T05:11:08.934Z","description":"A new study shows exposure to hormone-disrupting phthalates at an early age can harm thyroid function in young girls","url":"https://time.com/4799330/household-chemicals-phthalates-thyroid-girls/","keywords":["Public Health","Hormones","girls","phthalates","onetime"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltd087c01e96a33c3c/6988cf8397cdff68e26b0efc/makeup.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Alexandra Sifferlin","jobTitle":null,"url":"https://time.com/author/alexandra-sifferlin/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltd087c01e96a33c3c/6988cf8397cdff68e26b0efc/makeup.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Toiletries in Transparent Bag","caption":"Toiletries in Transparent Bag","creditText":"Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/health/","name":"Health"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/public-health/","name":"Public Health"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4799330/household-chemicals-phthalates-thyroid-girls/","name":"How Household Chemicals Can Hurt Young Girls' Health"}}]}] ```