Paul Brown, Keris KrennHrubec, Dana Casciotti, Ph.D., Brandel France de Bravo, MPH
Phthalates are synthetic chemicals found in every home, in plastic toys, personal care products such as shampoos and lotions, vinyl floors, and shower curtains. They are used to make plastic flexible and to add fragrances to soap and other personal products. Unfortunately, these chemicals don’t stay inside the products — they are also released into the air and dust, and so they are found in human urine, blood, and breast milk. Levels are highest in women and children ages 6 to 11. Young children may have higher levels of phthalates in their bodies because their hands find their way into their mouths more frequently: they touch objects made with phthalates and surfaces covered with phthalate dust, and then their hands touch their mouths.
Phthalates are called “endocrine disruptors” because they affect the body’s hormones by mimicking them or blocking them. They interfere with the body’s natural levels of estrogen, testosterone, and other hormones, which is why they are called “disruptors.” Endocrine disruptors are hard to study for several reasons: 1) we are exposed to very small quantities from many different sources every day, 2) researchers have proved that, unlike other chemicals, these appear to have more serious effects at lower levels than at higher levels. Usually, we assume that the higher the dose or exposure, the greater the harm, but endocrine disruptors play by different rules. The director of the National Institute of Environmental Health Sciences, Linda Birnbaum, says that chemical manufacturers are asking “old questions” when they test for safety even though “science has moved on.” 
Hormones can increase the risk of some cancers, whether those hormones are natural or synthetic. Too much or too little of a hormone can be harmful. Is a child who is exposed to phthalates more likely to develop cancer as an adult? No one knows for sure but animals exposed to phthalates are more likely to develop liver cancer, kidney cancer, and male reproductive organ damage.
Research indicates that boys exposed to phthalates may be more likely to develop smaller genitals and incomplete descent of the testicles. Boys who are born with undescended testicles are 2-8 times more likely to develop testicular cancer later on than men born with both testicles descended (their risk is lessened if they get corrective surgery before age 13). Studies by Harvard researchers have shown phthalates may alter human sperm DNA and semen quality.,,,
Phthalates are believed to also affect girls’ hormones, but the health impact is not yet known. Studies also show associations between children’s exposure to phthalates and the risk of asthma, allergies and bronchial obstruction.,,
Recent Studies: Prenatal Exposure to Phthalates
Childhood exposure to phthalates begins in the womb. Several studies that have tested phthalate levels in women in their third trimester of pregnancy have found health effects in the infants, toddlers, and older children of the mothers with the highest levels. There are many different types of phthalates. Most studies look at several types, and the effects tend to vary by type. A 2011 study conducted in Korea found that six-month-old boys whose mothers had the highest phthalate levels scored lower on brain and motor development tests. The same effect was not true for female infants.
In 2011, Columbia University researchers discovered that three-year olds with high prenatal exposure to two types of phthalates were more likely to have motor delays. They also reported that three phthalates were linked to certain behavior problems in three-year olds, such as social withdrawal. One phthalate in the study was linked to lower mental development in girls
In 2011, researchers at Mount Sinai School of Medicine studied the impact of prenatal exposure to “low molecular weight” phthalates-the kind often found in personal care products and the coatings of some medications-on the social behavior of children ages 7 to 9. Children who were exposed to higher levels of these phthalates, which include DEP and DBP, had worse scores for social learning, communication, and awareness. This means they were less able to interpret social cues, use language to communicate, and engage in social interactions.
Researchers at Mount Sinai also found a link between obesity and phthalates. They found that among overweight girls ages 6 to 8, the higher the concentration of certain phthalates (including low molecular weight phthalates) in their urine, the higher their body mass index (BMI). BMI takes height and weight into account when determining if someone is overweight. There was no apparent relationship between phthalates and obesity for normal weight girls or boys. A 2010 study among Danish children ages 4 to 9 found that the higher the concentration of phthalates (all of them), the shorter the child. This was true for girls and boys. More research is needed to determine the impact of phthalates on height and BMI:
What is Being Done to Limit Children’s Exposure?
As of February, 2009, children’s toys and child care products sold in the U.S (such as teething rings and plastic books) cannot contain phthalates. The ban on phthalates is the result of a law passed in 2008, the Consumer Product Safety Improvement Act. The law permanently bans certain kinds of phthalates (BBP, DBP and DEHP) from toys and child care products, and temporarily bans other phthalates (DIDP, DINP and DnOP) until a scientific board (the Chronic Hazard Advisory Panel) determines for the Consumer Product Safety Commission (CPSC) whether or not they are safe
Although the ban has been in place since February, 2009, testing to ensure these products are actually phthalate-free was delayed through December 31, 2011 in order to give small businesses time to comply with the new law.
A few months before the bill passed, major retailers such as Wal-Mart, Target, and Babies “R” Us promised to remove or severely restrict children’s products containing phthalates by the end of 2008. That provided added incentives for major companies making teething rings and other soft plastic products to stop using phthalates.
The ban in the U.S. followed similar bans in other countries. In 2006, the European Union banned the use of 6 phthalates in toys that may be placed in the mouth by children younger than 3 years old. The banned phthalates are DINP, DEHP, DBP, DIDP, DNOP, and BBzP. Fourteen other countries, including Japan, Argentina, and Mexico, had also banned phthalates from children’s toys prior to the U.S.
Phthalate Exposure Continues
Children and adults in the U.S. are still exposed to phthalates in many other products, including shampoo, soap, lotions, food packaging, pharmaceuticals, and medical devices and tubing. The U.S. Food and Drug Administration (FDA) regulates many of these products, including baby shampoo and baby lotion. If the FDA does not decide to ban phthalates from these products, legislation would be required to do so.
In 2009, U.S. Environmental Protection Agency (EPA) Administrator Lisa Jackson announced that EPA is developing an “action plan” for several chemicals including phthalates. The action plan will outline the risks that phthalates may present and the specific steps EPA will take to address those concerns such as regulatory action to label, restrict, or ban the chemicals. When completed, the action plan will be posted at www.epa.gov.
While other government agencies are concerned about phthalates in specific products, the EPA focuses on the chemicals for use in any kind of product and establishes safety standards for each phthalate. A challenge for the EPA is to set safety standards that make sense given that people may be exposed to several phthalates from many different sources. Teenage girls, for instance, have been found to use up to 17 personal care products a day. Setting safety standards for phthalates individually or for individual products without considering their interactions and cumulative effects could underestimate the real-world risks of phthalates to the health of children and adults.
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