Dibutyl phthalate (DBP) is an organic compound which is commonly used as a plasticizer because of its low toxicity and wide liquid range.

The use of this substance in cosmetics, including nail polishes, is banned in the European Union under Directive 76/768/EEC 1976. The use of DBP has been restricted in the European Union for use in children's toys since 1999. An EU Risk Assessment has been conducted on DBP and the final outcome has now been published in the EU Official Journal. To eliminate a potential risk to plants in the vicinity of processing sites and workers through inhalation, measures are to be taken within the framework of the IPPC Directive (96/61/EC) and the Occupational Exposure Directive (98/24/EC)[15] Also includes the 2004 addendum.

Based on urine samples from people of different ages, the European Commission Scientific Committee on Health and Environmental Risks (SCHER) concluded that total exposures to DBP should be further reduced. Under European Union Directive 2011/65/EU revision 2015/863, DBP is limited to max 1000 ppm concentration in any homogenous material.

Source and more information: https://en.wikipedia.org/wiki/Dibutyl_phthalate