By Prof. Protus Nathan Uzorma
Hair extensions have become far more than a fashion accessory. Across Africa, Europe, America and particularly among women who wear braids, twists, wigs and other protective hairstyles, synthetic hair has become an important part of personal appearance, culture and convenience. It is affordable, versatile, lightweight and capable of producing countless styles without repeatedly manipulating natural hair. Yet beneath the beauty, colour, texture and convenience of some synthetic hair extensions lies a question that deserves much greater public attention: what chemicals are actually in the hair we attach to our heads? A significant 2026 study published by Elissia T. Franklin, Kristin Favela, Radonna Spies, Jacqueline M. Ranger and Ruthann A. Rudel in the American Chemical Society’s Environment & Health provides an important reason for consumers, manufacturers and regulators to ask that question. The researchers analysed 43 commercially available hair-extension products, representing synthetic and bio-based fibres, using sophisticated chemical-screening techniques. They detected 933 chemical signatures and 5,275 individual chemical detections, with 169 chemicals confirmed or tentatively identified. Forty-eight of those chemicals appeared on at least one public hazard list, while nearly 10% of the samples contained hazardous organotin compounds.
The first point that must be made, however, is one of scientific accuracy. The study did not establish that synthetic hair causes brain cancer, “hair cancer,” cancer of the head, or mental illness. There is presently no sound basis for telling women that wearing synthetic braiding hair has been proven to cause brain cancer or psychiatric illness. What the Franklin et al. study establishes is different—and still sufficiently concerning. It demonstrates that some hair extensions contain chemicals with recognised or suspected hazardous properties, including chemicals associated with carcinogenicity, endocrine disruption and other toxicological concerns. The researchers themselves emphasised that further research is needed to understand actual exposure levels and health effects. More than 80% of the chemical signatures detected could not be fully identified because appropriate analytical standards or reference spectra were unavailable. Thus, the responsible conclusion is not that every synthetic attachment is poisonous, but that the chemical composition of these products is inadequately understood and, in some cases, contains substances that deserve serious health scrutiny.
Among the substances that deserve particular attention are organotins, phthalates, polyaromatic compounds, nitroaromatic chemicals and certain halogenated compounds. Organotins are especially noteworthy because the 2026 investigation found them in nearly one-tenth of the samples, with some products containing tin concentrations above 0.4% by weight. The researchers confirmed four organotin structures using reference standards and identified seven additional structures through chemical analysis. Organotins can be used as stabilisers in plastics, including polyvinyl chloride, and some members of this chemical family have recognised toxicological concerns. The researchers also detected five phthalates, predominantly in bio-based and unspecified products, with some appearing in synthetic hair. Certain phthalates have been studied extensively because of their endocrine-disrupting properties. The presence of such chemicals does not automatically mean that a person wearing a particular extension will become ill; hazard and actual risk are not the same thing. Risk depends on the chemical, its concentration, the route of exposure, duration, frequency and individual susceptibility. Nevertheless, when a product is worn against the scalp for weeks, sometimes continuously, the question of chemical exposure becomes legitimate and important.
The concern becomes even more significant when synthetic hair is heated, burned, sealed or otherwise processed during braiding. The ACS researchers specifically noted that burning or heating synthetic hair is a common practice used to set and seal braids. Heating plastic-based materials can alter what chemicals are released into the surrounding environment. Earlier research has already demonstrated that hairstyling practices can release volatile organic compounds, while studies of hair products have identified chemicals such as phthalates, parabens, cyclosiloxanes and other substances of concern. Helm and colleagues (2018), for example, examined 18 hair products used by Black women and detected 45 endocrine-disrupting or asthma-associated chemicals across the products studied. James-Todd and colleagues (2021) subsequently found hormonal activity in commonly used Black hair products in laboratory testing. These studies do not prove that wearing extensions causes cancer or mental illness, but they reinforce a broader scientific message: hair and beauty products can be sources of chemical exposure, and repeated exposure deserves careful examination.
There is also a broader issue concerning women’s long-term exposure to endocrine-disrupting chemicals. Some chemicals used in personal-care products can interfere with hormonal signalling, and scientists have investigated possible relationships between these exposures and reproductive, metabolic and cancer-related outcomes. A 2024 study involving reproductive-age Black women found that hair-product use was associated with higher urinary biomarkers of several phthalates, phenols and parabens, suggesting that hair products can contribute to exposure to hormonally active chemicals (2024). The National Institute of Environmental Health Sciences has similarly highlighted research showing that some hair-care products contain chemicals linked to hormone disruption and certain cancers, while cautioning that such research does not establish that particular hair products directly cause cancer. This distinction is vital. We should not frighten women with claims that have not been demonstrated scientifically; rather, we should demand better information about what products contain and how much exposure consumers actually receive.
What, then, about cancer of the brain or head? At present, the evidence cited above does not support saying that synthetic hair extensions cause brain cancer. Nor does the 2026 ACS study report that women wearing extensions developed brain cancer or mental illness. The researchers were investigating chemical composition, not conducting a clinical study of cancer patients or psychiatric disorders. It would therefore be scientifically irresponsible to transform a chemical-screening study into a claim that women wearing synthetic braids will develop brain tumours. The same caution applies to claims about “mental illness.” Some toxic chemicals can affect the nervous system at sufficiently high exposures, but that general toxicological possibility is not evidence that wearing commercially available braiding hair causes psychiatric disease. The danger worth discussing is chemical exposure and potential toxicity—not an unproven diagnosis. This distinction protects the public from both unnecessary panic and the equally dangerous complacency that allows potentially hazardous consumer products to remain insufficiently examined.
The emerging evidence concerning hair products nevertheless gives consumers a legitimate reason to become more chemically conscious. Scientists including James-Todd and colleagues have repeatedly investigated endocrine-active chemicals in hair products, while Rudel and colleagues at the Silent Spring Institute have contributed substantially to research on chemical exposure from consumer and personal-care products. The 2018 Helm et al. study found that many targeted chemicals were not disclosed on product labels, raising an important question about transparency. A 2025 systematic review of chemical hair-straightening products similarly identified formaldehyde, formaldehyde-releasing preservatives, volatile organic compounds, metals, fragrances, phthalates, phenols and parabens as chemicals of concern across the literature, although that evidence concerns straighteners and related products rather than proving that the same risks apply to every hair extension. The lesson is therefore broader than synthetic hair alone: consumers need the right to know what chemicals they are placing on or around their bodies.
Yet synthetic hair should not be demonised indiscriminately. Hair extensions have genuine benefits. They allow people to change hairstyles without repeatedly applying heat or chemicals directly to their natural hair; they can provide convenience for people with hair loss or thinning; they support cultural and artistic expression; and protective styles can reduce some forms of daily manipulation of natural hair. Synthetic fibres can also be less expensive than human hair and offer consistency of texture, colour and style. The problem, therefore, is not that every synthetic fibre is inherently dangerous. The problem is poorly characterised chemical composition, inadequate disclosure and insufficient independent safety testing. The 2026 researchers themselves called for follow-up research, greater disclosure and policies that reduce hazardous chemicals in these products. Their work should therefore be interpreted as a warning to improve the industry—not as a declaration that every woman wearing braids is placing herself in immediate danger.
The responsibility now belongs not only to consumers but also to manufacturers, importers, beauty-product retailers and regulators. Manufacturers should disclose the principal chemical substances used to manufacture, dye, soften, stabilise, waterproof, preserve or flame-treat synthetic fibres. Products advertised as “non-toxic,” “chemical-free,” “antibacterial,” “flame-resistant” or “heat-resistant” should be independently tested rather than trusted merely because such words appear on packaging. Regulators should establish appropriate standards for chemicals of recognised concern and require meaningful ingredient disclosure. Beauty professionals should also be educated about safer handling practices, particularly when synthetic hair is heated or burned. Consumers, for their part, can reduce unnecessary exposure by choosing products from manufacturers willing to provide ingredient and safety information, avoiding products with unexplained strong chemical odours, limiting unnecessary heating or burning, and paying attention to scalp irritation, breathing discomfort or other unusual reactions. These measures do not guarantee safety, but they represent sensible precautions while scientific research continues.
Ultimately, the real message from the 2026 ACS study is not “throw away all your synthetic hair.” It is much more profound: beauty should not require ignorance about chemistry. The woman who spends hours in a salon having synthetic hair braided into her natural hair deserves to know what she is putting next to her scalp. The mother buying braiding hair for her daughter deserves meaningful safety information. The hairstylist who handles these materials every day deserves protection from unnecessary occupational exposure. And regulators deserve enough scientific evidence to establish reasonable standards. Franklin, Favela, Spies, Ranger and Rudel have opened an important scientific door by demonstrating that hair extensions can contain a surprisingly complex mixture of chemicals, including substances that warrant concern. Their findings should lead not to panic, but to better research, stronger regulation, transparent labelling and safer innovation. Until those improvements become routine, consumers should remember a simple principle: when something is worn on the body for weeks, beauty is not the only question—what it is made of matters too.