Phthalates are a family of chemical plasticisers used to make PVC flexible, to help fragrance last longer, and to give personal care products their texture and slip. Over 8 million tonnes are produced annually worldwide. They are found in flooring, food packaging, medical devices, personal care products, clothing and toys. They are also found in the urine of virtually every person tested in population biomonitoring studies, confirming near-universal human exposure.
What phthalates are and how they work
Phthalates are esters of phthalic acid. They work as plasticisers by inserting between polymer chains in PVC, reducing the rigidity of the material. Without phthalates, PVC is hard and brittle. With them, it becomes flexible vinyl. The same chemistry that makes phthalates good plasticisers makes them biologically problematic: they are lipophilic (fat-soluble), which means they migrate from products into food, dust and skin, and once absorbed, accumulate in fatty tissue. They are not chemically bound to the plastic matrix, which is why they leach continuously throughout the life of a product.
Where phthalates hide
The most common exposure routes: vinyl flooring (particularly older flooring installed before 2010), shower curtains made from PVC, food packaging (particularly fatty foods stored in flexible plastic), fragranced personal care products (phthalates are used as fragrance fixatives and are not required to be disclosed on labels under the EU and US fragrance trade secret exemptions), plastic food wrap, some medical tubing and blood bags, and children's toys. They are also found in some nail polish, hair spray and synthetic clothing.
“Phthalates are not chemically bound to plastic. They migrate continuously from products into food, dust and skin throughout the entire life of the product.”
What the health research shows
Phthalates are anti-androgenic: they block testosterone signalling, particularly during critical developmental windows. DEHP and its metabolites are associated with reduced testosterone in male infants, reduced anogenital distance (a marker of androgen exposure in the womb), and reduced sperm quality in adult men. A 2021 meta-analysis in Environmental Pollution found that higher urinary phthalate metabolites were significantly associated with lower sperm count and reduced sperm motility across 30 studies. Phthalates are also associated with earlier puberty onset in girls, insulin resistance and obesity, and allergic conditions including asthma.
Why children are most vulnerable
Children have higher exposure per unit body weight from dust ingestion and hand-to-mouth behaviour. Infants on PVC flooring have measurably higher urinary phthalate metabolites than those on wood or tile. Phthalate exposure during critical developmental windows, particularly in utero and in early infancy, is associated with measurable changes in reproductive development. The American Academy of Pediatrics published a policy statement in 2018 specifically recommending that families reduce phthalate exposure as part of a precautionary approach to protecting child health.
How to reduce exposure
Replace vinyl flooring when possible
When replacing flooring, avoid vinyl (PVC). Choose wood, tile, cork or linoleum (which is made from linseed oil, not PVC). In the interim, use area rugs over vinyl flooring to reduce direct dust contact.
Choose fragrance-free personal care products
Phthalates are used as fragrance fixatives and are hidden under the ingredient label term fragrance or parfum. Switching to fragrance-free eliminates this exposure route entirely.
Avoid PVC shower curtains
Replace PVC shower curtains with fabric (cotton or linen) alternatives. EVA is a safer plastic alternative if fabric is not practical.
Check toys for recycling code 3
PVC plastic carries recycling code 3. Check the bottom of children's toys, bath books and play mats. Avoid anything marked with a 3.