In The News

Scripps Howard News Service	Beware that nail polish - December 5, 2000
	Group links nail polish to birth defects - November 29, 2000
	Is Your Nail Polish Poisonous? - November 28, 2000
WSFB Chanel 3 Eyewitness News, Hartford, CT	Polish Problems? - November 28, 2000

EWG shoppers turned up 37 DBP-containing products from 22 companies.

Table 1. EWG shoppers turned up 37 DBP-containing products from 22 companies.

Name brand	Nail care product containing DBP
Black Radiance U.S.A.	Black Radiance Nail Color
Bon Bons	Bon Bons (nail polish)
Chanel	Nail Colour
Christian Dior	Nail Enamel
Club Monaco	Nail Color
Cosmar	Cosmar Press&Go Nails Kit
Cover Girl	Cover Girl Nail Slicks
Hard Candy	Nail Enamel
Loud Music	Nail Enamel
M	M Professional Nail Polish
Max Factor	Diamond Hard Nail Enamel
Maybelline	Express Finish Fast-Dry Nail Enamel Ultimate Wear (nail enamel) Salon Finish Nail Enamel
Nailene	Professional Solutions Acrylic Tough Polish Shield PROfessional Solutions Acrylic Polish Shield PROfessional Solutions Calcium Growth Builder Nail Paints Art Kit
NARS	Nail Polish
Naturistics	90 Second Dry Super Fast Nail Color
Nutra Nail	Nutra Nail Maximum Strengthener Nutra Nail Calcium Nail thickener Nutra Nail Iron Shield Nail Hardener
Oil of Olay	Nail Lacquer
Orly	Orly Salon Nails Nail Color
Tony & Tina	Tony & Tina (nail enamel)
Tropez	Nail Enamel
Sally Hansen	Color Fast! One Coat Fast-Dry Enamel Maximum Support Strengthen & Grow No More Breaks Restructurizing Strengthener Hard as Nails with Nylon Triple Strong Advanced Gel Nail Fortifier Thicken Up! Strengthening Nail Thickener Ultimate Shield Fortifying Base & Top Coat Hard as Nails Instant Strength Calcium Gel Nail Fortifier
Urban Decay	Nail Enamel
Wet 'n' Wild	Wet 'n' Wild Nail Color

Source: Environmental Working Group.

Chemical industry systematically defeats health protections

No pre-market safety testing or approval is required under any federal law for chemicals in cosmetics, toys, clothing, carpets, or construction materials, to name just a few obvious sources of chemical exposure in everyday life. This little known fact is the premeditated result of an orchestrated campaign by the chemical industry to avoid testing and regulation of their products. It largely explains why products like hair spray, hair dye, pacifiers, stain repellants, glues and children's toys get on the market, only to be found to contain highly toxic compounds at unsafe levels after decades of widespread use. Once these products are on the market, there is no practical legal mechanism by which health authorities can remove them from commerce, short of a public health disaster or consumer uproar.

OSHA

Since the 1950's, the chemical industry has systematically blocked efforts to require safety studies for the compounds it produces. This strategy first played out with workplace standards adopted under the Occupational Safety and Health Administration (OSHA), and was repeated with the passage and implementation of the Toxic Substances Control Act (TSCA).

The first chemical health standards in the United States were adopted by OSHA in 1972. Set in theory to protect workers, these standards were initially created in the 1940's by representatives from the chemical industry operating under the auspices of the American Council of Governmental and Industrial Hygienists (ACGIH). At the time the standards were first introduced in 1942, ACGIH issued major caveats regarding their application to human health, stating that: "[they are] not to be construed as recommended safe concentrations" (NCGIH 1942).

Toxicity tests on animals had barely been invented at that time, and the standards themselves were based on rough estimates of acutely hazardous and lethal levels of exposure. In the words of the scientist who devised many of them, the so-called threshold limit values (TLVs) were designed, "to provide a handy yardstick to be used as guidance for the routine control of these health hazards - not that compliance with the figures listed would guarantee protection against ill health" (Cook, 1945).

This did not stop the chemical industry from promoting TLVs as legitimate health standards, and in 1972, OSHA adopted TLVs wholesale as the nation's first set of enforceable health standards for chemicals in the workplace. In the process these "handy yardsticks" took on an aura of respectability that belied the fact that there was essentially no science to support their relevance to human health and safety. The best estimates are that basic toxicological data were available for only five percent of some 600 industrial chemicals for which OSHA had adopted standards by 1988 (Castleman and Ziem 1994, Roach and Rappaport 1990).

TSCA

This process of faux regulation was repeated again when the same chemical industry giants teamed up to write the nation's major toxic chemical law, the Toxic Substances Control Act (TSCA). Passed with virtually no regulatory teeth, TSCA has been an unparalleled failure. Of the 62,000 chemicals on the market when TSCA was passed in 1976, EPA has successfully requested data for 263 compounds. Of the 15,000 chemicals marketed in quantities exceeding 10,000 pounds per year, EPA has completed regulatory actions to limit use or exposures on just 5, or 0.03 percent (3 one hundredths of one percent). Four of the five were already regulated under other statutes, and only one, lead in paint, affected a consumer product (Roe et al 1997).

TSCA is best thought of as a self-defeating feedback loop. Under the law, all chemicals are presumed safe, and the burden of proof is on the EPA to demonstrate that a chemical is causing harm before it can take any regulatory action. However, the agency cannot require that industry conduct the tests needed to show that a chemical is causing harm, until the agency has shown that the compound may present an "unreasonable risk," or that human exposure is "substantial" or "significant". Substantial exposures can almost never be proven without additional data from industry, and significant exposures cannot be proven without information on the chemical's toxicity. Of course, compelling toxicity data are almost never available for the compound in question or EPA would not be trying to publish a test rule in the first place.

Even if all these hurdles are cleared, which is extremely unlikely, in order to request basic toxicity data on any single chemical the EPA must issue a test rule through the process of a rulemaking under administrative law. This roadblock is unique to TSCA. Under pesticide law, or food safety law, EPA or FDA can request virtually any test that they need to assess the safety of a compound.

A defining moment in the collapse of TSCA occurred in 1990 when EPA attempted to issue test rules for the paint thinner cumene. The proposed test rules were immediately challenged by the Chemical Manufacturers Association on the grounds that EPA had not shown that human exposure was "substantial," the basic requirement under Section 4 of the Act. The courts upheld the CMA argument that the burden of proving "substantial" exposure and risk was on the EPA and not the manufacturers (Chemical Manufacturers Ass'n v. EPA, 5th Cir. 1990).

To date EPA has issued rules requiring toxicity testing for 0.4 percent, or 263, of the 62,000 chemicals on the market when the law was passed. And even when issued, test rules generally do not require comprehensive testing. With barely any data generated via test rules the agency cannot support a finding of substantial risk for any chemical, and indeed the agency has taken only five final actions since passage of the law (Roe et al 1997).

The final nail in the coffin came in 1991. EPA was trying to use TSCA to regulate asbestos, arguing that it presented an "unreasonable risk of injury" to human health. Again the TSCA feedback loop prevailed, and the court ruled that EPA had not met the burden of providing substantial evidence that asbestos presented an unreasonable risk of injury to human health (Corrosion Proof Fittings v. EPA, 5th Cir. 1991). Since this decision, EPA has undertaken no additional major regulatory actions under the Act.

Under pressure from environmentalists and the Clinton administration, in 1999 the chemical industry agreed to conduct basic health screening tests for about 3,000 high production volume compounds out of a universe of more than 75,000 chemicals registered for commercial use today, 15,000 of which are marketed in quantities exceeding 10,000 pounds per year. This tiny step forward is entirely voluntary and, even if it is completed, it will not provide regulators and public health authorities with sufficient information to fully assess the long-term adverse effects of toxic chemical exposure. Tests now recognized as critical to a full understanding of a chemical's toxicity will not be conducted at all under this initiative. These include cancer bioassays, studies on the developing nervous system, the immune system, the endocrine system, and perhaps most important, human monitoring to determine the extent of human exposure.

This latter element is critical. As discussed below, a string of recent discoveries reveal that human exposure to commercial chemicals used in common consumer products is almost certainly much more pervasive than previously thought. This new strata of contamination is in addition to the considerable well-known toxic load of pollutants (such as PCBs, dioxin, and DDT) found in the blood and body fat of virtually all people in the industrialized world.

Phthalates

Beauty Secrets

Phthalates

Invented in the 1930's, the versatile group of common industrial chemicals called phthalates (pronounced tha-lates) are used as ingredients in a diverse range of consumer products from cosmetics to food wraps, toys and building materials. Currently the chemical industry produces billions of pounds of phthalates each year. They are used as plasticizers to soften plastic, as skin moisturizers and skin penetration enhancers in cosmetics, and as solvents in a wide range of applications. People are exposed to phthalates daily through their contact with consumer products and via food and indoor air.

In spite of their widespread presence in cosmetics and other common consumer products, industry has only partially studied the health effects of phthalates and has never tested for the presence of phthalates in human bodies. Finally, in April 1999, over six decades after phthalates were first marketed, the federal government's National Institute for Environmental Health Sciences (NIEHS) initiated a study of the effects of phthalates on the human reproductive system through their new Center for the Evaluation of Risk to Human Reproduction (CERHR).

At the same time, scientists at the Centers for Disease Control and Prevention (CDC) were achieving the first accurate measurements of phthalates in people. Researchers there were surprised to find that people have much higher levels of some phthalates in their bodies than predicted by previous estimates (Blount et al 2000). In October 2000, CDC scientists announced that levels of some phthalates in women of childbearing age, including dibutyl phthalate (DBP) and di(2-ethylhexyl) phthalate (DEHP), exceed the government's safe levels set to protect against birth defects. Estimates based on data from this study indicate that for more than 3 million heavily exposed women of childbearing age, exposures to DBP may be 20 times greater than the average exposures in the rest of the population (Kohn et al 2000).

This report focuses primarily on DBP, a widely used phthalate that produces serious reproductive and developmental effects in laboratory animals. But DBP is not the only toxic phthalate to which people are routinely exposed. Many other phthalates widely detected in human urine by the CDC cause the same birth and developmental defects to the male reproductive system as DBP. Absent evidence to the contrary, it is reasonable to assume that the health effects from exposures to multiple phthalates are additive.

Health effects of dibutyl phthalate

At least two decades ago, scientists began building a body of work indicating that DBP can be a powerful reproductive and developmental toxicant in laboratory animals, particularly for males. Early studies focused on DBP's ability to cause testicular atrophy (e.g., Gray et al 1980), but DBP is now known to cause a broad range of birth defects and lifelong reproductive impairment in male laboratory animals exposed in-utero and shortly after birth (Ema et al 1998, Marsman et al 1995, Mylchreest et al 1998, 1999, and 2000, Gray et al 1999, Wine et al 1997 ).

Scientists believe that the active toxicant of DBP exposure is its first breakdown product, monobutyl phthalate (MBuP), which has been shown to harm the male reproductive system. The precise mechanism of action is not known but the pattern of reproductive harm is consistent with other so-called anti-androgens or chemicals that interfere with the male hormones called androgens.

Effects in immature male animals: DBP exposure damages the testes, prostate gland, epididymus, penis, and seminal vesicles in laboratory animals (see, for example, Mylchreest et al, 1998). These effects persist throughout the animal's life, and include, specifically:

• Testicular atrophy (the testes produce sperm and male sex hormones)
• Hypospadias (a defect of the penis in which the opening occurs on the bottom of the penis instead of the tip)
• Undescended testicles Ð a condition in which the testes fail to descend into the scrotal sac during pregnancy.
• Ectopic testes Ð a condition in which testes are grown outside the scrotal sac
• Absent testes Ð testes are not formed at all
• Absent prostate gland (the prostate gland contributes liquid secretions to semen)
• Absent or small seminal vesicles (seminal vesicles, like the prostate gland, contribute liquid secretions to semen)
• Reduced sperm count (reduced fertility of offspring)
• Malformed or absent epididymus (the epididymus is the structure where sperm mature and are stored)

Potential health effects of DBP continue to be significant for newborn animals who can be exposed to DBP by breathing phthalate-contaminated air, by touching things that contain phthalates, or by drinking their mother's milk, which can contain phthalates as a result of her exposures. In young lab animals, DBP has been shown to cause permanent testicular atrophy and reduced sperm counts (Foster et al 1981, Marsman 1995).

In animal tests DBP is also "embryolethal" - causing loss of pregnancy - and prevents implantation of the fertilized egg. In lab animals it also causes "resorption" of some or all of the fetuses in a litter, where the mother's body essentially dissolves the fetus without miscarriage. DBP also causes a range of skeletal and external birth defects for male and female offspring of animals exposed during pregnancy Ð including deformity of vertebra and ribs, cleft palate, and fused breastbone (Ema et al 1994 and 1995).

Relevance to people

Broad and disturbing trends in human male reproductive health include many of the same effects seen in lab animals dosed with phthalates. Although a cause and effect relationship has not been established, the ubiquity of phthalates in the human population creates a biologically plausible presumption that phthalates may be contributing to these problems. Until proven safe, phthalates should be considered as potential contributors to the following human health effects:

• Declining sperm count: Recent analysis of 101 studies (1934-1996) by Shanna Swan of the University of Missouri confirms results of previous studies: average sperm counts in industrialized countries are declining at a rate of about 1 percent each year (Swan et al 2000).
• Hypospadias: Data from the Centers for Disease Control show that rates of hypospadias in the U.S. began climbing in about 1970, and continued this increase through the 1980s. This condition is a physical deformity of the penis in which the opening of the urethra occurs on the bottom of the penis instead of the tip. (Currently the occurrence of hypospadias appears to be stable, at about 30 to 40 cases per 10,000 births.) (Paulozzi 1999)
• Undescended testicles: This birth defect, where testicles fail to completely descend into the scrotum during pregnancy, occurs in 2-5 percent of full-term boys in Western countries. Rates of the defect increased greatly in the U.S. in the 1970s and 1980s. Men born with this defect are at higher risk for testicular cancer and breast cancer (Paulozzi 1999).
• Testicular cancer: This is the most common cancer of young men in many countries, including the U.S. Its incidence continues to increase at a rate of about 2 to 4 percent each year in industrialized countries, although rates appear to have stabilized in the U.S. after a 20-year increase. Men with hypospadias, infertility, and undescended testicles - the same constellation of conditions seen in lab animals exposed to DBP - are at greater risk for developing testicular cancer (Toppari et al 1996 and Moline 2000).

History of recent government studies of phthalates

In April 1999, CERHR initiated a review of the reproductive and developmental effects of phthalates in humans. The Center chose seven phthalates for examination, based on consideration of production volume, extent of human exposures, use in children's products, or published evidence of reproductive or developmental toxicity.

They addressed the following three questions for each phthalate based on their current understanding of levels of human exposure to phthalates:

1.Are young children at risk for harm to the reproductive system?

2.Is the fetus at risk for developmental effects when the mother is exposed?

3.Are adults at risk for effects to the reproductive system?

In their June 2000 report draft CERHR assigned low, minimal, or negligible concern to five phthalates, and higher concern for only one, DEHP. ("Concern" refers to whether CERHR believes the chemical is a reproductive or developmental toxicant in people at current levels of exposure.)

In September 2000, Dr. Brock and his team of CDC scientists published the results of the first human testing program for phthalates (Blount et al 2000). The results turned the CERHR conclusions of minimal concern on end. They found phthalates in every person tested, and at surprisingly high levels in some individuals for some phthalates. The scientists concluded that "from a public health perspective, these data provide evidence that phthalate exposure is both higher and more common than previously suspected, " adding that, "Exposure data for phthalates is (sic) critically important for human risk assessment, especially among potentially susceptible populations."

Brock and his team measured levels of seven phthalate metabolites in the urine of 289 adults. They found metabolites from two of these in 100 percent of those tested - dibutyl phthalate, or DBP, and benzylbutyl phthalate, or BzBP. A metabolite of DBP called monobutyl phthalate (MBuP), a potent reproductive toxin in lab animals, was found at significantly higher levels in women of childbearing age. Six of the eight highest measured levels were in this group. CDC postulates in their paper that high exposures to phthalates in women of childbearing age may arise from the use of cosmetics and beauty products. See Sidebar

These results caught both government and industry off guard. Now, government scientists are beginning a search for answers: Are normal body levels of phthalates safe for infants and pregnant women? How are people exposed to phthalates - through which consumer products and via what pathway?

Government scientists published a letter in the October issue of Environmental Health Perspectives outlining the significance of the CDC urine study. Their analyses showed that the highest exposures measured, in women of childbearing age, were above federal safety levels set to protect against birth defects. Estimates based on these data indicate that DBP exposures for up to 3 million women of childbearing age may be 20 times higher than for the rest of the population.

In an effort to determine key routes of exposure, CDC is beginning work on an extensive survey to find which products are causing the high DBP levels in women of childbearing age.

Phthalates: regulated as toxic pollutants - but OK in consumer products

Phthalates are considered a hazardous waste and are regulated as pollutants in air and water. In contrast, phthalates are essentially unregulated in food and cosmetics. (One phthalate, DEHP, which was removed from children's toys more than a decade ago, is regulated in drinking water.)

Under various environmental laws, individual companies are limited with regards to how much DBP they can release to the environment as pollution each year. For example, industries must report any spill or release of DBP over 10 pounds, and industries using phthalates must keep records of their location and transportation. But FDA does not limit the amount of DBP that can be used in cosmetics and other beauty products. And the FD&C Act does not require that cosmetic manufacturers or marketers test their products for safety.

So, by design from the chemical industry, the federal government treats phthalates with a bipolar approach. Phthalates are recognized as toxic substances under environmental law, but companies are free to use unlimited amounts in cosmetics. Moreover, the labeling requirements for cosmetics are riddled with loopholes. If a woman reads the fine print on the back of every cosmetic bottle she purchases, she might discover whether the product contains phthalates. However, she won't know the quantiy of phthalates in the product, or what health effects her use of the product could possibly have on her fetus.

Specifically, FDA's labeling requirements state that all cosmetics produced or distributed for retail sale to consumers for their personal care bear a list of ingredients, ordered by prevalence (21 CFR 701.3). Cosmetic labeling requirements apply to all cosmetics marketed in the U.S., whether manufactured here or abroad. But it's simple for industry to hide phthalates in consumer products, as components of fragrances, flavorings - or chemical mixtures that are considered "trade secrets" - all of which are exempt from labeling requirements.

Remarkably, women who work in nail and hair salons and presumably get the highest exposures, are not protected even by labeling regulations. Ingredient labeling requirements do not apply to products used only by beauty professionals in the workplace. The 1997 U.S. Economic Census shows that over 407,000 people are employed in the more than 81,000 beauty salons across the country. These employees, primarily women including what is likely a large percentage of women of childbearing age, are exposed to DBP in beauty products daily, with no knowledge of it and no option for choosing alternate products.

The federal government has "low" confidence in their safe daily dose value for DBP

Ten years ago, using a study published in 1953, the Environmental Protection Agency (EPA) established a "safe" daily dose of DBP, called the Reference Dose, or RfD. Even then, the EPA characterized this pivotal study as weak, and their confidence in the RfD as "low." Ten years later the agency has not revised the safe dose, nor required new studies to strengthen its knowledge of DBP toxicity.

The CDC found that high-end DBP exposures in women of childbearing age are above the federal safe daily dose (Kohn et al 2000). If the safe daily dose value were brought up to modern standards, even more women in the CDC study group would fall into the zone of concern.

The study supporting the RfD is archaic in design and does not provide any information on the health effects that concern scientists today - birth defects in male offspring. The study included only adult male rats, and death was the only health effect studied. Irrespective of the fact that the study examined only the most crude endpoint, the results are of marginal relevance to real world human exposures, and do not provide a sufficient scientific basis to establish a safe exposure level under contemporary standards applied to pesticides or food additives regulated under federal law. EPA admits that the study has many deficiencies. In their documentation of the RfD the agency states "The Oral RfD for dibutyl phthalate may change in the near future pending the outcome of a further review now being conducted by the Oral RfD Work Group" (EPA 1990).

Nonetheless, the current RfD is derived from a "safe" dose in this study of 125 mg of chemical ingested per kilogram of body weight (mg/kg) - the dose that was shown to induce no additional deaths relative to the control group. A study published this year (2000) found that exposures at this level, thought previously to produce no effects, in fact cause birth defects in male pups, including extra nipples in a third of the pups (Mylchresst et al 2000). This study found a "safe" dose, called a no observed adverse effect level, or NOAEL, of 50 mg/kg - 60 percent lower than the dose that is currently the basis for the RfD.

Phthalates in cosmetics and beauty products

It is remarkable that such a heavily used chemical, with known toxicity, can be so poorly regulated. For example, Procter & Gamble holds a patent which proposes to add 5 milligrams of DBP to each dose of an oral pharmaceutical. A woman of average weight (140 pounds) ingesting this tablet would get a daily dose of DBP that is 80 percent of her current allowable daily dose defined by the RfD. She would get double the dose that would be allowed if the RfD were updated to protect the male fetus from birth defects, assuming no other exposure to DBP in other products.

The Environmental Working Group conducted a web-based analysis to locate consumer products, particularly cosmetics and beauty aids, containing phthalates. We found both dibutyl phthalate (DBP) and diethyl phthalate (DEP) in numerous products, and butylbenzyl phthalate (BBP) in a smaller number of products. Ultimately we limited our search to DBP, because it is a more potent reproductive and developmental toxin than DEP, and is found in a greater number of products than BBP.

Several points became clear during our product search. First, alternatives to phthalates are readily available to industry, as only a fraction of any given type of cosmetic or beauty product contains phthalates.

Second, women have no practical way to choose products that are phthalate-free. Some cosmetics contain ingredient labels on the outside of the product, but the print is so small as to be nearly unreadable, and a typical shopper will not know that "dibutyl phthalate" is the same thing as "butyl ester" or even possibly "plasticizer." Other products, such as more expensive perfumes, contain ingredient labels inside the packaging where they cannot be read until after the product is purchased. We found still other products on store shelves, particularly imported products, that lacked ingredient labels altogether, in direct violation of federal regulations.

Third, with information currently in the public arena, it is nearly impossible to develop anything approaching a comprehensive list of cosmetic and beauty products that contain phthalates. This would require a product-by-product, label-by-label search of every single cosmetic and personal care box and bottle sold in the United States. The results of our analysis only scratch the surface of what will be a daunting task for CDC as they try to define exactly where women of childbearing age are being exposed to phthalates.

As a first step in discovering some of the beauty and personal care products that contain DBP, the Environmental Working Group (EWG) shopped at a local Rite-Aid, surfed the on-line store Drugstore.com, and searched the U.S. patent office records for products that contain DBP in the patent application. We found that DBP may be used in a broad range of beauty and personal care products, including shampoos and conditioners, lotions, hair growth formulations, antiperspirants, and sunscreen. It can even be used in gum, candy and pharmaceuticals taken orally.

Our product label searches in electronic and real-world drugstores showed that, for the consumer, the products most easily found that contain DBP are nail enamels and hardeners. In a limited label search of nail products on online drugstore web sites, EWG found DBP in a wide variety of name brand items, including Cover Girl and Maybelline nail enamels (Table 3).

The difficulty of compiling comprehensive lists of phthalate-containing cosmetics, from label searches alone, led us to conduct a web-based patent search to discover which companies claimed cosmetic-related inventions that included phthalates as ingredients. As of October 5, 2000, the U.S. Patent and Trademark Office had records of 309 patents related to cosmetics that included DBP as an essential or optional ingredient, or as an ingredient in an example product formulation. Thirty-eight individual companies or inventors hold 105 recent cosmetic-related patents that propose DBP as an additive (Table 4).

In some patents, companies gave information on the percent by weight of DBP proposed to be added to the product. DBP in nail polishes tends to be added at about five percent by weight (for example, Maybelline nail enamel patent 5972095), but DBP in other products ranged up to 20 percent, in a night cream invented by the Japanese company Shiseido (patent number 5891846) (Table 5).

Why the cosmetic industry adds phthalates to their products

Multiple chemical properties of DBP make it a useful additive in many types of cosmetics. These properties include its ability to impart flexibility to thin films for mascara and nail polish, its oily texture that makes skin feel soft, and its ability to make lotions penetrate deeper into the skin (Table 6).

DBP as a plasticizer in nail enamel

The plasticizing and film-formation properties of DBP make the chemical particularly useful for nail polish. After nail polish is applied, some of the ingredients volatilize and leave behind a film that is the coating over the nail. DBP is one of the ingredients left behind, reducing brittleness and cracking in the polish.

If the DBP stayed intact in the polish, women might absorb negligible amounts of the chemical into their bodies. But a group of scientists in Hamburg, Germany showed that water-soluble components of the polish, like DBP, are dissolved out of the polish each time they contact water, a conclusion they reached after measuring the leaching of DBP from nail polish that had dried for three days. In fact, one of the reasons nail polish eventually chips is that it becomes brittle as DBP is leached out of the film. This means that every time a woman washes her hands, DBP is washed out of her nail polish and contacts her skin. The scientists conclude that "water-soluble components... attain the skin during extensive but transient contact." Therefore, a woman wearing nail polish not only can absorb DBP through her nail, but also has multiple opportunities to absorb DBP directly through her skin.

Since the 1940's scientists have known that nail polish contains allergenic ingredients (Sainio et al 1997). Some companies are beginning to study formulations of nail polish that have reduced quantities of DBP, because of concerns over allergic reactions. The well-known French cosmetics company L'Oréal, in patent number 5,676,935, claims "Nowadays, it is preferable to use plasticizers other than phthalates in varnishes for reasons of allergy..." In fact, allergic responses to DBP can be severe. In a 1999 case study published in the journal Dermatology, the authors describe a case of anaphylactic shock, a severe allergic reaction, in a patient exposed to DBP in the coating of an oral pharmaceutical (Gall et al 1999).

The ability of DBP to cause allergic reactions means that the chemical can induce a state of hypersensitivity in the immune system. Environmental antigens such as DBP can cause the immune system to respond to chemical exposures with immunological reactions that are harmful, varying from hives to life-threatening responses such as anaphylactic shock, where low blood pressure and breathing difficulties can result in death.

L'Oréal USA is still using DBP in their nail products - for example, in their Maybelline Express Finish Fast-Dry, Ultimate Wear, and Salon Finish nail enamels that EWG found on the shelves of a Rite-Aid drugstore in Washington DC, in September 2000. Even DBP's well-recognized effects on the immune system have not been enough to change manufacturers' practices.

DBP as a "penetration enhancer"

Both Elizabeth Arden Company (New York, New York) and Chesebrough Ponds (Greenwich, Connecticut) hold patents for cosmetics in which DBP is proposed as a penetration enhancer.

Elizabeth Arden proposes DBP as an additive to skin care products, where DBP is used to get more of the product deeper into the skin: "improving [the product's] delivery through the stratum corneum to its site of action in the epidermis." Similarly, Chesebrough Ponds proposes that DBP can be added to a hair growth formulation for men to help the formulation penetrate deeper into the scalp to the site of action at the hair follicles.

Research from the chemical giant Zeneca gives more evidence that DBP acts as a penetration enhancer. Their work shows that when DBP is added to products for the skin, allergic reactions are more severe (in this case, to ingredients other than DBP). The scientists postulate that the enhanced allergic reactions stem from DBP's ability to deliver the chemicals deeper into the skin (Dearman et al 1996).

The use of DBP as a penetration enhancer stands in direct contrast to CERHR's assertion that "Dermal contact with products containing DBP is possible, but absorption through the skin is most likely minimal." The Center cites a study of DBP migration through rat skin. CDC, on the other hand, upon discovering high levels of DBP in women of childbearing age, postulates that dermal absorption is playing a role: "Dermal absorption also occurs at a significant rate for phthalates with short side chains such as ...DBP...," citing the same rat study as evidence (Blount et al 2000).

Regardless of how various government agencies are interpreting the dermal absorption study in rats, industry continues to use DBP specifically for its ability to absorb deep into the skin.

DBP as a humectant and emollient

DBP is listed as a humectant or emollient in patents from Procter & Gamble Company (Cincinnati, OH), Lever Brothers Company Inc (New York, NY), Colgate Palmolive Company (New York, NY), Kraft General Foods (Northfield, IL), Anheuser-Busch, Incorporated (St Louis, MO) and four other companies. Humectants are skin moisturizers; emollients soften the skin. Information in patents from these major companies indicate that DBP is added to skin care products because its oily texture gives the impression that the skin itself is soft and moisturized, when in fact it is the DBP residue that makes the skin feel this way.

References

• Blount BC, MJ Silva, SP Caudill, LL Needham, JL Pirkle, EJ Sampson, GW Lucier, RJ Jackson, JW Brock. October 2000. Levels of seven urinary phthalate metabolites in a human reference population. Environmental Health Perspectives. 108(10):979-982.
• Castleman, BI, and GE Ziem. 1994. American Conference of Governmental Industrial Hygienists: Low Threshold of Credibility. American Journal of Industrial Medicine. 26:133-143.
• Center for the Evaluation of Risks to Human Reproduction (CERHR), National Toxicology Program, U.S. Department of Health and Human Services. October 2000. NTP-CERHR Expert Panel Report on Di n Butyl Phthalate. NTP-CERHR-DBP-00.
• Dearman RJ, Cumberbatch M, J Hilton, HM Clowes, I Fielding, JR Heylings, I Kimber. 1996. Influence of dibutyl phthalate on dermal sensitization to fluorescien isothiocyanate. Fundam Appl Toxicol 1996 Sep;33(1):24-30.
• Ema M, Amano H, Ogawa Y. 1994. Characterization of the developmental toxicity of di-n-butyl phthalate in rats. Toxicology 86:163-174.
• Ema M, Kurosaka R, Amano H, Ogawa Y. 1995. Comparative developmental toxicity of n-butyl benzyl phthalate and di-n-butyl phthalate in rats. Arch Environ Contam Toxicol 28:223-228(1995).
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Background material on Dibutyl Phthalate (DBP)

• Health Effects of Dibutyl Phthalate (DBP)
• The Dangers Of Phthalates: Industry Spin vs. Fact
• History of Regulation and Scientific Study for DBP
• EWG Letter to Cosmetic Companies
• Phone numbers for Cosmetic Companies that use phthalates
• U. S. Food and Drug Administration Center for Food Safety and Applied Nutrition Office of Cosmetics Fact Sheet
• EWG letter to Michael D. Shelby, Ph.D.
• Size comparison of ingredient label of nail polish to a flea