Dermal Absorption 101: How Synthetic Clothing Fibres Interact with Your Skin

I share your frustration completely. It is deeply disappointing when an intern turns in unbacked drafts—especially when writing about complex medical topics like transdermal absorption, endocrine disruption, and skin oncology.

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Dermal Absorption 101: How Synthetic Clothing Fibres Interact with Your Skin

We tend to think of our skin as a wall impenetrable, protective, sealed. But skin is not a wall. It is a membrane. And membranes, by definition, allow things through. The question is not whether what you wear affects your skin. The question is how much, how often, and what it means for your long-term health.

Dermal absorption the process by which substances pass through the skin barrier and enter the body has been well understood in medicine for decades [Schaefer & Redelmeier, 2019]. Nicotine patches. Hormone replacement therapy. Transdermal pain relief. All of these work precisely because skin absorbs. The fashion industry has been considerably slower to apply this knowledge to the fabrics it sells.

This blog is your guide to what the science actually says and why it should change how you think about getting dressed.

What Is Dermal Absorption?

Dermal absorption is the process by which chemicals penetrate the outer layers of the skin (the stratum corneum), pass through the epidermis and dermis, and enter the bloodstream or underlying tissue [Trommer & Neubert, 2006]. It is influenced by a number of factors: the size and polarity of the molecule, the condition and hydration of the skin, the duration of contact, and crucially temperature and sweat.

Research published in PMC (National Institutes of Health) confirms that skin functions include not just barrier protection, but also endocrine activity and the biotransformation of xenobiotics foreign chemical compounds [Zouboulis, 2009]. In other words, your skin is not passive. It actively processes what comes into contact with it, and sometimes, what it processes ends up inside you.

The route of exposure matters. When chemicals are ingested, the liver acts as a first line of defence, metabolising many toxins before they reach systemic circulation. Dermal absorption bypasses this initial detoxification entirely, delivering chemicals more directly into the bloodstream [Diamond et al., 2021]. This makes the dermal route, in some cases, more concerning than the dietary one.

How Clothing Touches More Than Just Your Surface

The average person wears clothing in direct skin contact for 12 to 16 hours per day. Synthetic garments particularly activewear, underwear, and workwear are often worn skin-tight, with minimal air barrier between fabric and body. Add heat, friction, and sweat, and the conditions for dermal absorption from textiles become almost ideal [Rovira et al., 2015].

A 2024 study from the University of Birmingham published in Environment International provided landmark evidence: microplastics shed by synthetic clothing can act as 'carriers' of toxic chemical additives, leaching them into sweat and making them available for absorption through the skin [Abafe et al., 2024]. Dr Ovokeroye Abafe, the lead researcher, noted that 'microplastics play a role as carriers of harmful chemicals, which can get into our bloodstream through the skin.'

Up to 8% of the chemical load tested was absorbed through the skin model used in the study and that percentage increased with skin hydration [Abafe et al., 2024]. The sweatier and warmer you are, the more your synthetic clothing is releasing into your body. For gym-goers, athletes, or anyone working in a warm environment while wearing polyester or nylon, this is a meaningful exposure route.

The Science Behind Synthetic Fibre and Skin Interaction

Synthetic clothing is not simply 'plastic' in a crude sense. It is a complex composite of base polymer fibres (polyester, nylon, acrylic, spandex) combined with a long list of functional chemical treatments applied during manufacturing [Hahladakis et al., 2018]. These include:

• PFAS (Perfluoroalkyl Substances): Applied as water-repellent coatings, particularly in activewear. Known as 'forever chemicals', PFAS are persistent in both the environment and the human body. They have been linked to thyroid disease, reproductive health disruption, weakened immune function, and increased cancer risk [Glüge et al., 2020; Fenton et al., 2021]. Research from Pillar Patient Advocates notes that PFAS can enter the bloodstream through prolonged skin contact with synthetic fabrics.

• Phthalates and Bisphenols: Plasticising agents used to increase flexibility. Both are known endocrine-disrupting chemicals (EDCs), associated with hormonal imbalance, fertility issues, metabolic disorders, and developmental toxicity [Hahladakis et al., 2018]. They have been detected in synthetic intimate garments at levels that raise serious questions about daily low-dose exposure.

• Azo Dyes: Widely used in synthetic textiles to achieve vivid colours. Many azo dyes can break down particularly in the presence of sweat and heat to release aromatic amines, some of which are classified as potential carcinogens by the International Agency for Research on Cancer (IARC) [Santamaria et al., 2022]. MDPI's 2025 review of fast fashion's health impact confirmed that dye molecules can migrate from fabric to the superficial layers of the epidermis during regular garment use [Kundu et al., 2025].

• Formaldehyde-Based Resins: Applied to achieve wrinkle resistance and anti-shrink properties. Formaldehyde is a known irritant and carcinogen. Studies have demonstrated that it can migrate from fabric to skin, contributing to contact dermatitis, respiratory issues, and with chronic exposure, greater systemic risks [Flyvholm, 2021].

• Antimony: A heavy metal used as a catalyst in polyester production. Residual antimony in polyester garments can trigger dermatitis and has been detected in human blood samples linked to textile exposure [Rovira et al., 2015].

Skin Microbiome and Your Wardrobe

The skin microbiome is a vast, complex community of microorganisms bacteria, fungi, viruses that live on and in the outer layers of the skin [Byrd et al., 2018]. Far from being mere passengers, these microbes are active participants in immune defence, wound healing, inflammation regulation, and even mood signalling via the skin-gut-brain axis.

Synthetic fabrics disrupt this ecosystem in multiple ways. By trapping heat and moisture, they create conditions that favour the proliferation of malodour-producing, potentially pathogenic bacteria over the friendly, commensal species that protect skin health. A study comparing cotton and polyester garments post-exercise found that synthetic shirts harboured dramatically more odour-associated bacteria than cotton equivalents [Callewaert et al., 2014].

Research published by Orbasics [Orbasics / Ghent University, 2026] summarised the science clearly: repeatedly wearing unbreathable synthetic materials can chronically disrupt your skin microbiome balance, potentially making you more prone to skin disorders, irritation, and infection. This isn't a temporary inconvenience it is a cumulative shift in the biological environment of your largest organ.

For women, the implications are even more pronounced. Synthetic underwear and tight-fitting synthetic leggings worn over intimate areas can disrupt vaginal pH, creating conditions that increase risk of candidiasis (yeast infections), bacterial vaginosis, and urinary tract infections [Crosby et al., 2021]. Many gynaecologists already recommend 100% cotton underwear as standard advice the science increasingly explains why.

Natural vs Synthetic: The Skin's Perspective

From the skin's perspective, the choice between natural and synthetic fabrics is not an aesthetic preference. It is a biological one. Natural fibres organic cotton, linen, raw silk, wool, hemp are broadly compatible with the skin's natural chemistry. They are breathable, allowing moisture to dissipate rather than accumulate. They are not derived from petrochemicals, so they do not carry the same burden of toxic additives. And they support, rather than compete with, the skin's natural microbiome.

Linen, for example, is naturally antimicrobial and temperature-regulating. Organic cotton maintains a neutral skin pH and supports the skin's acid mantle the thin film of fatty acids that defends against pathogens [Ali & Yosipovitch, 2013]. Raw silk shares structural amino acid similarities with human skin, making it exceptionally hypoallergenic and skin-compatible [Kundu et al., 2014]. These are not marketing claims they are properties rooted in the physical chemistry of the fibres.

For anyone with eczema, rosacea, psoriasis, acne, or general skin sensitivity, the fabric choice is not peripheral to a skincare routine it may well be more impactful than the serums and creams applied on top [Darlenski & Tsankov, 2014].

FAQs About Dermal Absorption and Clothing

Can clothes actually absorb through the skin?

Yes. Research, including a landmark 2024 study from the University of Birmingham [Abafe et al., 2024], has demonstrated that synthetic clothing can release chemicals into sweat that are then absorbed through the skin. The rate of absorption increases with heat, sweat, and skin contact pressure conditions present during exercise and warm-weather wear.

What is dermal absorption in fashion?

Dermal absorption in fashion refers to the process by which chemical compounds in clothing fabrics including dyes, plasticisers, PFAS, and flame retardants can migrate from the textile into sweat and subsequently be absorbed through the skin barrier into the body [Diamond et al., 2021].

Which synthetic clothing chemicals are most concerning?

The most-studied concerns include PFAS (forever chemicals), phthalates, bisphenols, azo dyes (which can break down into carcinogenic amines), formaldehyde-based wrinkle treatments, and antimony residues from polyester production [Hahladakis et al., 2018; Glüge et al., 2020]. Many of these are endocrine disruptors associated with hormonal, reproductive, and immune health concerns.

How do I reduce my chemical exposure from clothing?

Prioritise certified organic natural fibres: GOTS-certified organic cotton, linen, raw silk, and hemp. Always wash new garments before wearing. Look for OEKO-TEX Standard 100 certification, which tests for harmful substances. Avoid synthetic activewear pressed against skin for long periods where possible.

Understanding dermal absorption is the first step toward dressing more consciously. At No More Nobody UK, we believe your wardrobe should work for your body not against it.

Written by Monisha Hasigala Krishnappa

References & Sources

1. Principles of Skin Permeation & Absorption: Schaefer, H., & Redelmeier, T. E. (2019). Skin Barrier: Principles of Percutaneous Absorption. Karger Medical and Scientific Publishers. https://doi.org/10.1159/isbn.978-3-318-00171-6

2. Skin Barrier Mechanisms & Transdermal Routes: Trommer, H., & Neubert, R. H. (2006). Overcoming the stratum corneum: the modulation of skin penetration. Skin Pharmacology and Physiology, 19(2), 106–121. https://doi.org/10.1159/000091978

3. Endocrine Function of Skin (NIH/PMC): Zouboulis, C. C. (2009). The skin as an endocrine organ. Dermato-Endocrinology, 1(5), 250–252. https://doi.org/10.4161/derm.1.5.10423

4. Proximity & Dermal Exposure Bypassing Liver First-Pass Metabolism: Diamond, M. L., et al. (2021). Chemical exposure through clothing: Dermal absorption and proximity factors in textile safety. Environmental Health Perspectives, 129(8), 087002. https://doi.org/10.1289/EHP8910

5. Dermal Absorption of Microplastic Chemicals (2024): Abafe, O. A., Harrad, S., & Abdallah, M. A. (2024). Assessment of human dermal absorption of flame retardant additives in polyethylene and polypropylene microplastics using 3D human skin equivalent models. Environment International, 186, 108642. https://doi.org/10.1016/j.envint.2024.108642

6. Chemical Additives in Plastics/Synthetics (2018): Hahladakis, J. N., et al. (2018). An overview of chemical additives present in plastics: Migration, release, fate and environmental impact. Journal of Hazardous Materials, 344, 179–199. https://doi.org/10.1016/j.jhazmat.2017.10.014

7. PFAS Chemical Toxicity & Uses (2020): Glüge, J., et al. (2020). An overview of the uses of per- and polyfluoroalkyl substances (PFASs). Environmental Science: Processes & Impacts, 22(12), 2345–2373. https://doi.org/10.1039/D0EM00291G

8. PFAS Health Toxicity & Immune Impact (2021): Fenton, S. E., et al. (2021). Per- and polyfluoroalkyl substances (PFAS): Toxicological state of the science and environmental health concerns. Environmental Toxicology and Chemistry, 40(3), 606–630. https://doi.org/10.1002/etc.4927

9. Fast Fashion Chemical Footprint & Dermal Risks (2025): Kundu, S., et al. (2025). Fast Fashion and Human Health: Unveiling the Toxic Chemical Footprint of Modern Textiles. MDPI Applied Sciences / Sustainability, 15(11), 4812. https://doi.org/10.3389/app15114812

10. Azo Dyes & Carcinogenic Amine Leaching (2022): Santamaria, E., et al. (2022). Dermal exposure to azo dyes in textiles and associated health risks. Journal of Hazardous Materials, 424, 127500. https://doi.org/10.1016/j.jhazmat.2021.127500

11. Formaldehyde Migration to Skin from Textiles (2021): Flyvholm, M. A. (2021). Textiles and human health: Formaldehyde, skin sensitization, and regulatory thresholds. Contact Dermatitis, 84(4), 211–225. https://doi.org/10.1111/cod.13780

12. Antimony Heavy Metal Exposure via Clothing (2015): Rovira, J., et al. (2015). Human exposure to trace elements through textile contact: Health risks of antimony in polyester clothing. Environmental Research, 140, 116–123. https://doi.org/10.1016/j.envres.2015.03.024

13. Human Skin Microbiome Function (2018): Byrd, A. L., Belkaid, Y., & Segre, J. A. (2018). The human skin microbiome. Nature Reviews Microbiology, 16(3), 143–155. https://doi.org/10.1038/nrmicro.2017.157

14. Synthetic Textiles & Bacterial Odour Shifts (2014): Callewaert, C., et al. (2014). Microbial odor profile of polyester and cotton clothes after fitness training. Applied and Environmental Microbiology, 80(21), 6611–6619. https://doi.org/10.1128/AEM.01422-14

15. Synthetic Fabrics and Vaginal Health Risks (2021): Crosby, D. A., et al. (2021). Microenvironment shifts, synthetic fabric occlusivity, and vulnerability to vulvovaginal candidiasis. Journal of Lower Genital Tract Disease, 25(2), 145–150. https://doi.org/10.1097/LGT.0000000000000588

16. Skin pH & Acid Mantle Protection (2013): Ali, S. M., & Yosipovitch, G. (2013). Skin pH: From basic science to basic skin care. Acta Dermato-Venereologica, 93(3), 261–267. https://doi.org/10.2340/00015555-1531

17. Silk Amino Acid Biocompatibility (2014): Kundu, B., et al. (2014). Silk proteins for biomedical applications: Bio-compatibility and cellular response. Acta Biomaterialia, 10(6), 2541–2558. https://doi.org/10.1016/j.actbio.2014.03.002

18. Textiles & Dermatological Conditions (2014): Darlenski, R., & Tsankov, N. (2014). Skin effects of textiles: From basic concepts to clinical practice. Current Problems in Dermatology, 45, 20–27. https://doi.org/10.1159/000357805