DEHP, or di(2-ethylhexyl) phthalate, is a synthetic chemical added to plastics to make them soft and flexible. It is the most widely used phthalate plasticizer in the world, found in everything from vinyl flooring and shower curtains to medical tubing and food packaging. DEHP has drawn significant attention because it can leach out of plastic products and enter the human body, where it acts as an endocrine disruptor.
What DEHP Is and Why It’s in Plastic
DEHP is a colorless, nearly odorless oily liquid made from phthalic acid and a branched alcohol called 2-ethylhexanol. It dissolves easily in oils and organic solvents but barely dissolves in water, at roughly 0.3 milligrams per liter. That oil-loving quality is exactly what makes it useful as a plasticizer: it slots between the rigid molecular chains of polyvinyl chloride (PVC) and loosens them up, turning a hard, brittle plastic into something you can bend, stretch, and fold.
PVC products can contain anywhere from 1% to 40% DEHP by weight, depending on how flexible they need to be. Because DEHP isn’t chemically bonded to the PVC, it gradually migrates to the surface and can escape into whatever the plastic touches, whether that’s food, blood, air, or skin.
Where You’ll Find It
DEHP shows up in a wide range of consumer and industrial products:
- Household items: vinyl flooring, shower curtains, tablecloths, imitation leather furniture, rainwear, and footwear
- Children’s products: some plastic toys (though many countries now restrict this)
- Food contact materials: certain food packaging and plastic wrap
- Medical devices: IV bags, blood storage bags, dialysis tubing, and other PVC-based hospital equipment
- Other uses: wire and cable coatings, adhesives, some inks, cosmetics, pesticide formulations, and vacuum pump oil
The medical device category is especially significant. PVC blood bags plasticized with DEHP have been standard in hospitals for decades because DEHP actually helps stabilize red blood cells during storage. But that same property means the chemical leaches directly into blood products and IV fluids that enter patients’ bloodstreams.
How DEHP Gets Into Your Body
For most people, the primary route of exposure is swallowing it. DEHP enters food from plastic packaging, especially when fatty foods contact PVC containers (the chemical is drawn to fats and oils). Household dust is another major source: as DEHP slowly evaporates from vinyl flooring, furniture, and other products, it settles into dust that you inhale or accidentally ingest.
Skin contact with DEHP-containing products provides a smaller but measurable dose. Workers in plastics manufacturing face higher exposure through both skin contact and breathing contaminated air. Hospital patients receiving blood transfusions, IV medications, or dialysis through PVC tubing can receive significantly higher exposures than the general population, sometimes over extended periods.
Health Concerns
DEHP’s primary concern is its ability to interfere with the hormone system. Once inside the body, DEHP and its breakdown products can mimic or block the signals that sex hormones normally send. They interact with hormone receptors, disrupt signaling pathways that control cell growth and death, and alter the release of reproductive hormones from the brain and pituitary gland.
The reproductive system is the most sensitive target. DEHP has been identified as a reproductive toxicant that specifically affects the development of the male reproductive system. It can interfere with hormones critical for testicle descent in developing boys and disrupt the hormones that regulate follicle development in females. Because of these effects, PVC medical devices containing DEHP are not recommended for use with pregnant women or boys going through puberty.
People who face the greatest risk are those with chronic medical exposures. Dialysis patients, people with hemophilia who receive frequent blood products, and premature infants in neonatal intensive care units all encounter DEHP repeatedly through medical tubing and bags. Research has shown that even small amounts of DEHP leaching from PVC IV bags, on the order of 5 micrograms per milliliter, can trigger immune responses. Concentrations as low as 10 micrograms per milliliter caused release of a compound that can provoke allergic-type inflammatory reactions in human blood serum.
Safety Limits
The U.S. EPA sets a maximum contaminant level for DEHP in drinking water at 0.006 milligrams per liter, or 6 parts per billion. The reference dose for daily oral exposure, the amount considered unlikely to cause harm over a lifetime, is 0.02 milligrams per kilogram of body weight per day. For a 70-kilogram (154-pound) adult, that works out to about 1.4 milligrams per day.
Several countries and regions have gone further. The European Union restricts DEHP in toys and childcare articles, and various jurisdictions have pushed hospitals to transition to DEHP-free alternatives for vulnerable patient populations.
How to Identify and Avoid DEHP
The simplest way to spot products that may contain DEHP is to check the recycling symbol on the bottom of plastic items. A number 3 inside the triangular recycling arrows, sometimes accompanied by the letter “V” or “PVC,” indicates polyvinyl chloride, which is the plastic most likely to be plasticized with DEHP. Plastics marked with the numbers 1, 2, 4, or 5 do not use phthalate plasticizers and are safer choices for food storage and everyday use.
Beyond reading recycling codes, you can reduce exposure by storing food in glass or stainless steel containers instead of soft plastic, avoiding microwaving food in plastic wrap or PVC containers (heat accelerates DEHP migration), and keeping indoor dust levels down with regular wet cleaning, since vinyl products in homes release DEHP into household dust over time.
Alternatives Replacing DEHP
The shift away from DEHP is well underway, particularly in medical settings. Several alternative plasticizers now appear in hospital devices, including citrate-based compounds, a cyclohexane-based plasticizer called DINCH, and a trimellitate-based option known as TOTM. One hospital study found that TOTM had become the dominant plasticizer in medical devices, with DEHP reduced to trace levels. Another promising replacement is DEHT, a modified version of the phthalate structure that migrates less readily out of plastic and shows lower toxicity in testing.
Some manufacturers have moved away from plasticizers altogether, using silicone tubing that doesn’t require any softening agent. For consumer products, many toy and childcare manufacturers have reformulated to meet phthalate restrictions, though DEHP remains common in building materials, industrial applications, and products manufactured in regions with fewer regulations.