Clothes made from recycled plastic are not dramatically more dangerous than clothes made from virgin polyester, but they do carry measurably higher levels of certain chemicals, and the science on long-term skin exposure is still catching up. Most recycled-plastic clothing is made from recycled polyethylene terephthalate, or rPET, typically sourced from old water bottles. The recycling process keeps plastic out of landfills and oceans, but it also concentrates some contaminants that were either in the original material or introduced during collection and reprocessing.
What Recycling Adds to the Fabric
Every plastic item headed for recycling carries a history. A water bottle might have sat in the sun, absorbed flavors and dyes from its label adhesive, or been tossed into a bin with household chemicals. When those bottles are collected, sorted, shredded, and melted into new fibers, some of those contaminants come along for the ride. A review of recycling-related hazards found that phthalates can form during waste collection, while flame retardants and heavy metals get introduced during the reprocessing itself. For textiles specifically, the list of potential hitchhikers includes detergents, resistant coatings, antibacterial agents, pesticides, dyes, volatile organic compounds, and nanomaterials.1PubMed. Safety of recycled plastics and textiles: Review on the detection, identification and safety assessment of contaminants
That is a long list, and it sounds alarming, but context matters. Virgin polyester is not a clean slate either. Conventional textile manufacturing involves dyes, finishing chemicals, and antimicrobial treatments of its own. The difference is that recycled material inherits whatever the source plastic was exposed to in its first life, plus whatever the recycling facility adds. The concern is accumulation across cycles, not a single dramatic toxin.
Bisphenols in Recycled Versus Conventional Clothing
One of the better-studied contaminant classes in recycled textiles is bisphenols, particularly BPA and its substitute BPS. These compounds act as endocrine disruptors at sufficient doses, meaning they can interfere with hormone signaling. A 2024 study that tested both T-shirts and socks found BPA and BPS in nearly all samples, whether the fabric was conventional or recycled. But the recycled fabrics showed consistently higher BPA levels. The average BPA concentration in recycled textiles was about 94 nanograms per gram, compared to roughly 12 nanograms per gram in conventional ones. The highest single measurement came from a pair of recycled-polyester socks at 625 nanograms per gram.2PubMed Central. Bisphenols in daily clothes from conventional and recycled material: evaluation of dermal exposure to potentially toxic substances
Those numbers are small in absolute terms, measured in billionths of a gram per gram of fabric. The researchers noted that the presence of BPA in recycled materials likely reflects its widespread use in the past, its persistence through the recycling process, or higher concentrations in the source plastics destined for recycling. What they could not yet determine is whether these fabric-level concentrations translate into meaningful doses through the skin over a day of wearing. That gap between “detectable in the fabric” and “harmful to the wearer” is where much of the uncertainty lives.
Antimony and the Sweat Factor
Antimony is a metal that most people never think about, but it is central to polyester production. It serves as a catalyst in manufacturing PET and also shows up as a flame-retardant additive in both new and recycled polymers. A study that tested polyester textiles designed for skin contact found total antimony concentrations ranging from about 125 to 470 micrograms per gram of fabric. When those fabrics were soaked in artificial sweat solutions, somewhere between 0.05% and 2% of the antimony migrated out, yielding roughly 0.1 to 1 microgram per gram in the sweat.3PubMed. Antimony release from polyester textiles by artificial sweat solutions: A call for a standardized procedure
This matters because antimony release is not unique to recycled polyester. It happens with virgin polyester too, since the catalyst is baked into the fiber from the start. The recycling process can add more antimony when it is used as a flame retardant synergist, but the basic issue is a polyester problem, not strictly a recycled-polyester problem. The study’s authors called for a standardized testing procedure, noting that current methods vary enough that comparing results across labs is difficult. Without that standardization, it is hard to say exactly when antimony levels in a garment cross from trivially low to worth worrying about.
How Chemicals Move From Fabric Into Your Body
Detecting a chemical in fabric is one thing. Showing it reaches your bloodstream is another. The route from clothing to body is called dermal absorption, and researchers have demonstrated it works for several textile-related chemicals. A 2024 study of halogenated aromatic compounds commonly found in clothing showed that all the investigated pollutants migrated from the textile into artificial sweat and were then absorbed through a skin model, though the extent varied between compounds.4PubMed. Health risks from exposure to chemicals in clothing – Non-regulated halogenated aromatic compounds
A separate study focused on benzothiazole, a rubber-related chemical common in textiles. Using a membrane designed to mimic human skin, researchers found that after 24 hours, up to 62% of the benzothiazole had passed through the skin-mimicking barrier entirely, while up to 37% accumulated within the membrane itself. Benzothiazole was also released directly from contaminated fabric samples and then permeated through the skin model.5PubMed Central. Chemicals from textiles to skin: an in vitro permeation study of benzothiazole
These are lab results using artificial skin and sweat, so they represent a plausible pathway rather than a measured real-world dose. Your actual exposure depends on how much you sweat, how long you wear the garment, whether it was washed before first use, and how tightly it fits against your body. Activewear pressed against sweaty skin during a long run represents a very different scenario from a loose recycled-polyester jacket worn over a cotton shirt. The skin absorption research confirms the mechanism is real, but it does not yet produce tidy numbers for daily risk.
Volatile Compounds and Off-Gassing
Recycled PET also carries volatile organic compounds, the same general class of chemicals responsible for “new car smell” and the fumes from fresh paint. A 2024 analysis tracked VOCs through every stage of the mechanical recycling process and found that cold-water-washed recycled PET contained 135 identifiable VOCs, far more than the 52 found in virgin PET. But here is the encouraging part: the recycling process itself knocked most of them out. After full thermal treatment and solid-state polycondensation, only 33 VOCs remained. Specific compounds like o-xylene, hexanoic acid, octanal, and D-limonene dropped from measurable concentrations to zero or near-zero by the end of the process.6PubMed. Characterization and elimination efficiency of volatile organic compounds in mechanically recycled polyethylene terephthalate at various recycling stages
The takeaway is that recycled PET starts dirtier than virgin PET in terms of VOC content, but thorough processing largely cleans it up. The word “largely” is doing some work in that sentence. Different recyclers use different processes, and not every facility runs its material through the full decontamination pipeline. Cheaper or less rigorous recycling operations might produce rPET that retains more volatile compounds. If you have ever noticed a faint chemical smell when opening a package of recycled-content clothing, that is likely residual VOCs. Washing the garment before wearing and letting it air out addresses most of this.
Microfiber Shedding During Laundry
A separate concern with any polyester garment is the tiny fibers that break free during washing and enter waterways. People who choose recycled-polyester clothing for environmental reasons understandably want to know if their eco-friendly shirt sheds more microplastics than a conventional one.
The evidence is mixed. A controlled study that compared virgin and recycled polyester textiles across four fabric groups found no statistically significant difference in microfiber release. Both types shed between roughly 6,400 and 62,000 microplastic fibers per gram, with wide variation driven more by fabric construction than by whether the polyester was recycled.7Resources, Conservation and Recycling. Differences in the release of microplastic fibers and fibrils from virgin and recycled polyester textiles Another study found that a 70% recycled polyester fabric actually shed fewer microfibers than a 40% recycled blend, suggesting that the percentage of recycled content does not map neatly onto shedding rates.8AATCC Journal of Research. Do Recycled Cotton or Polyester Fibers Influence the Shedding Propensity of Fabrics during Laundering?
However, a different study on serviceability and washing durability reported that recycled polyester had about 50% higher fiber loss than virgin polyester during laundering. The same study noted that recycled wool shed even more, with fiber loss 83% higher than recycled polyester.9Industrial Crops and Products. Serviceability and washing durability of recycled polyester, wool, and acrylic: Sustainability concerns and microfiber leaching These conflicting results likely reflect differences in how the fabrics were manufactured, the yarn structure, and the finishing treatments applied. Fabric construction decisions at the mill probably matter more than whether the polyester came from a bottle or a factory.
Airborne Particles From Clothing
Microfibers do not only escape during laundry. Every time you move in polyester clothing, some fibers and particles lift off the fabric and enter the air around you. A chamber study found that on average, between 0.3% and 3% of particles deposited on fabric were released with fabric motion, with rubbing and shaking being more effective at dislodging particles than simple stretching. Most of the release happened quickly after movement began.10Indoor Air. Clothing as a transport vector for airborne particles: Chamber study
This finding applies to all clothing, not just recycled-content garments. But it adds another exposure route to think about: in addition to chemicals migrating through your skin via sweat, you may also inhale tiny fiber fragments throughout the day. Whether these inhaled fibers carry meaningful chemical loads into the lungs is still being studied. The concern is plausible but not yet quantified in a way that changes practical advice.
Why Polyester Breeds More Odor
If you have ever pulled a polyester workout shirt out of the hamper and recoiled, there is a microbiological reason. A study that collected T-shirts after fitness sessions found that polyester shirts smelled significantly less pleasant and more intense than cotton ones. The culprit was a difference in which bacteria colonized each fabric type. Micrococci, a group of bacteria associated with strong body odor, were found in nearly all the synthetic shirts but almost none of the cotton ones.11PubMed Central. Microbial odor profile of polyester and cotton clothes after a fitness session
This is not a recycled-versus-virgin issue. It is a polyester-versus-natural-fiber issue. Polyester’s smooth, hydrophobic surface lets odor-causing bacteria thrive in a way that cotton’s absorbent, textured surface does not. But it is worth noting because many people switch to recycled polyester specifically for activewear, where sweat and odor are at their peak. The environmental benefit of recycled content does not change the fabric’s tendency to harbor smelly bacteria, and aggressive laundering to combat odor increases microfiber shedding. It is a bit of a catch-22 for the sustainability-minded exerciser.
Simple Ways to Reduce Your Exposure
If you wear recycled-polyester clothing and want to minimize chemical exposure, a few practical habits help:
- Wash before wearing: A first wash removes residual processing chemicals, loose dye, and surface-level VOCs. This is good practice for any new clothing, conventional or recycled.
- Favor loose fits for everyday wear: Tight-fitting garments pressed against sweaty skin maximize the conditions for chemical migration. Looser fits reduce sustained skin contact.
- Layer with natural fibers: Wearing a cotton or linen base layer under a recycled-polyester outer layer puts a buffer between the synthetic fabric and your skin.
- Use a microfiber-catching laundry bag: These mesh bags trap shed fibers before they enter the drain, addressing the environmental side of the equation without requiring you to ditch synthetic fabrics entirely.
- Air out new garments: Hanging a new recycled-polyester item outdoors or in a well-ventilated room for a day or two helps volatile compounds dissipate before you wear it.
None of these steps require avoiding recycled-polyester clothing altogether. They reduce exposure at the margins, which is the reasonable response to a low-level, not-fully-quantified risk.
The Regulatory Gap
One reason the safety picture for recycled-plastic clothing remains fuzzy is that regulation has not caught up with the market. Food-contact recycled PET is tightly regulated in most countries; the material that lines your yogurt cup has to pass contamination thresholds set by agencies with clear testing protocols. Textile-grade recycled PET faces far less scrutiny. There is no international standard that limits how much BPA, antimony, or residual VOC a recycled-polyester shirt can contain before it reaches your closet.
The review of recycling-related contaminants noted that information on textile-specific hazards remains limited and further research is required.1PubMed. Safety of recycled plastics and textiles: Review on the detection, identification and safety assessment of contaminants The EU’s REACH regulation covers some chemicals in textiles, and the Oeko-Tex certification system tests for harmful substances, but these frameworks were designed primarily with virgin textiles in mind. Recycled materials introduce a different contaminant profile, one shaped by the unknowable history of the source waste, and existing safety frameworks are only beginning to adapt.
For consumers, this means brand transparency matters more than it normally would. A recycled-polyester garment from a company that tests for contaminants and uses a rigorous decontamination process is a very different product from one sourced from the cheapest recycler with minimal quality control. Certifications like Oeko-Tex Standard 100 or GOTS (for blends containing organic fibers) provide some assurance that the finished fabric has been tested for harmful residues, though neither certification was specifically designed to address the contaminant profile of recycled feedstock. Until regulation catches up, those third-party certifications are the closest thing to a safety net for recycled-content clothing.