Zara, Shein, and H&M Linked to Cancer-Causing Toxins

The US “fast fashion” market is extremely popular, valued at approximately $21 billion as of 2024. Its immense profitability stems from low overhead costs associated with synthetic materials, vibrant colors, and consumer-friendly prices. The top three names in the industry are global giants: H&M, Shein, and Zara.

While the world’s attention has primarily focused on issues such as child labor in clothing production, the unsold inventory of non-biodegradable fabrics ending up in landfills, and the environmental impact of industrial pollutants leaking into waterways, one major concern has been overlooked: the health impact of clothing on consumers. Until now, this aspect has received little attention.

Research highlighting this issue is set to be presented at the American Chemical Society’s spring meeting, currently taking place in Atlanta, Georgia.

The study found that the fabrics used in fast-fashion clothing contain high levels of lead, a heavy metal that can be absorbed through the skin and enter the bloodstream. Once in the body, lead is transported to various organs, causing severe damage to the brain, neurons, and blood vessels, which raises the risk of autism and high blood pressure.

Experts assert that there is no safe level of lead exposure. The Consumer Product Safety Commission has established a limit of 100 parts per million for lead in children’s clothing.

In their study, a team in Indiana tested 11 fast-fashion children’s shirts dyed in red, pink, orange, yellow, gray, and blue, and found that they all exceeded the recommended safe limit for lead.

Overall, brightly colored garments, particularly red and yellow, showed the highest concentrations of heavy metals. The clothing was sold at four fast-fashion and discount retailers for children, though the sellers were not identified in the research.

Researchers believe that this issue is not limited to children’s clothing; similar heavy metal contamination is likely present in adult garments as well.

The source of lead in clothing remains unclear, but researchers suggest it may be linked to the fabric dyeing process, which often involves soaking the cloth in lead acetate to make the dye brighter and longer lasting. Safer alternatives, such as tannins derived from oak bark and pomegranate peels, are available but significantly more expensive, which affects the final retail price—a consideration that fashion vendors often prioritize.

To further examine the potential health risks, researchers simulated digestion in the laboratory to determine how much lead could be absorbed by the body, mimicking the effects of children chewing on clothes. Results indicated that lead levels in the body after this simulated digestion could exceed 100 parts per million.

Dr. Kamila Deavers, a biologist and the project’s principal investigator, initiated the study after discovering that her young daughter experienced a brief spike in blood lead levels linked to exposure to certain toy coatings.  

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