Cotton is one of the most widely used fibres in the world, accounting for approximately 22% of global fibre production and forming the foundation of countless textile supply chains (Chen et al., 2023). Yet organic cotton presents a challenge that every business in the supply chain needs to understand: not all organic cotton claims in the market are backed by independent verification. For brands and manufacturers relying on or responding to those claims, the difference between a substantiated certification and an unverified label is not simply a matter of marketing. Increasingly, it is a matter of regulatory compliance and commercial credibility.
Organic and Conventional Cotton: Understanding the Difference
To understand why verification matters, it is key to understand what organic cotton is, and how it is different to the conventional alternative. Fundamentally, these two forms of cotton are differentiated by their farming methods. Organic cotton is grown without synthetic pesticides, synthetic fertilisers, or genetically modified seeds. Farming practices rely on crop rotation, natural pest management, and soil enrichment to maintain productivity - an approach that prioritises long-term soil health and ecological resilience. Conventional cotton farming, by contrast, may include synthetic pesticides, fertilisers, and selectively bred seeds, optimised to meet the demands of large-scale global supply chains. However, it is through these differences that the environmental and human impacts of the two systems diverge considerably.
Without full supply chain transparency, the impacts of any given conventional cotton product can be difficult to attribute with precision. What the research does make clear, however, is the scale of the contrast between the two systems across four key areas: land health and wildlife, water consumption, and human health.
· A 2025 systematic review of twenty peer-reviewed LCA studies confirmed that organic cotton farming consistently demonstrates lower environmental impacts per unit area than conventional systems (Morin et al., 2025).
· Despite occupying approximately 2.4% of global agricultural land, conventional cotton accounts for an estimated 11% to 25% of global insecticide and pesticide use, depending on the scope of measurement (Environmental Justice Foundation, 2018; Yalcin-Enis et al., 2022).
· Conventional cotton production is estimated to require over 2,700 litres of water per T-shirt, while up to 80% of organic cotton is rain-fed, substantially reducing its draw on freshwater systems (Yalcin-Enis et al., 2022).
· A peer-reviewed cross-sectional study of 585 cotton farmers in Burkina Faso found that 88.95% of conventional farmers reported neurological health effects following pesticide exposure, compared to 48.71% of organic farmers, a statistically significant difference across multiple health categories (Koussé et al., 2023).
Having established these differences, the significance of one question becomes clear: how do you know what you are buying?
The Integrity Problem
Demand for organic cotton has grown significantly, but the market has a well-documented integrity problem: not all cotton sold as organic can be verified as such (Wicker et al., 2022). The complexity of global textile supply chains creates multiple points at which documentation can be falsified, conventional cotton substituted, or genetically modified (GMO) varieties introduced into supply chains where non-GMO status has been claimed.
This is not a peripheral concern. A European Commission study found that 40% of green claims made by companies were completely unsubstantiated, with over half making environmental claims that were vague, misleading, or unfounded (European Commission, 2021). The EU Green Claims Directive, currently progressing through EU legislation, will make the substantiation of environmental claims a legal requirement for businesses operating in EU markets. For businesses that have incorporated organic cotton into their product claims or sustainability reporting, the question is no longer whether to verify - it is how.
The textile sector in most markets currently has no mandatory certification requirement for the use of the word 'organic' on a label. This means brands can apply organic claims without independent verification, and buyers have no reliable means of distinguishing genuinely certified products from those that are not. For brands, the consequences of unsubstantiated claims extend beyond regulatory risk. Research consistently shows that once consumer trust is compromised, it is exceptionally difficult to recover (Khamitov et al., 2024). In an era of increasing supply chain scrutiny, the reputational cost of a misleading organic claim can significantly outweigh any short-term commercial gain. Third-party certification is the mechanism that closes this gap. Certification is the logical response to a market integrity problem. But choosing the right certification requires understanding what different frameworks do, and do not, cover.
Not All Certifications Are Equal
Several certification frameworks exist for organic cotton, and understanding their scope is important for businesses making sourcing or compliance decisions.
Some certifications focus on the processing and manufacturing stages, verifying that a facility meets defined environmental and social criteria. However, they do not include direct laboratory testing for harmful substance residues in the finished textile article, nor laboratory-based verification that the physical fibre is free from GMO content.
Others address the organic status of the cotton fibre as grown and harvested, with chain-of-custody controls through the supply chain, but without the additional layer of product safety testing on the finished article.
The most robust approach combines both: independent verification of organic origin from farm to finished article, alongside laboratory-based testing of the physical fibre and the finished product. This distinction matters because organic origin and product safety are related but separate questions. A fibre can be grown organically but subsequently processed with chemical inputs that compromise the safety of the finished article. Conversely, a finished product can pass safety testing without the underlying fibre being genuinely organic. Credible certification addresses both. It is this combined approach - organic origin verified alongside finished product safety - that defines OEKO-TEX® ORGANIC COTTON.
OEKO-TEX® ORGANIC COTTON
OEKO-TEX® ORGANIC COTTON, launched in 2023, is designed to address exactly this gap. It is a certification that begins at the farm, where cotton must be certified organic according to one of the IFOAM Family of Standards, and follows the fibre through every stage of the supply chain to the finished textile article via verified transaction certificates.
A technically distinctive feature of the certification is its mandatory GMO testing of the physical fibre. Verifying non-GMO status requires specialist laboratory analysis; it cannot be established through documentation alone. At Shirley®, this testing is conducted using ISO/TS 5354-2:2024, providing scientifically rigorous detection of GM-derived DNA in cotton.
The certification also requires rigorous testing of the finished textile article for pesticide residues and other harmful substances, with every component - fibre, thread, and accessories - required to meet defined test criteria and limit values. It supports compliance with the EU REACH Directive, US CPSIA lead requirements, and EU POPs Regulation.
Key requirements of OEKO-TEX® ORGANIC COTTON include:
- Farm-level organic certification to IFOAM Family of Standards
- Full chain-of-custody traceability via OEKO-TEX® transaction certificates
- No mixing of organic and conventional cotton - complete segregation throughout
- Mandatory GMO testing of the physical cotton fibre
- Product safety testing for pesticides and harmful substances across all components
- Annual quality audit and on-site facility inspection
- Certificate valid for one year, with annual renewal
The certification applies to textile products and accessories containing more than 70% organic cotton, across raw materials, intermediary products, and finished goods including clothing and home textiles. While items that sit outside that range cannot certify for OEKO-TEX® ORGANIC COTTON, those products may be eligible to apply for OEKO-TEX® STANDARD 100. The latter certifies that a finished textile article and its components have been tested against a comprehensive list of over 1,000 harmful substances. For businesses whose products fall outside the organic cotton threshold, it provides a credible and accessible route to independently verified product safety certification.
Shirley® and OEKO-TEX®
Shirley®, an established textile institute with over 100 years of experience and a global presence, has been a member of the OEKO-TEX® Association for over 30 years and is a single point of contact for the full range of OEKO-TEX® offerings, including organic cotton certification.
For businesses looking to certify products, verify supply chain claims, or understand what OEKO-TEX® ORGANIC COTTON requires in practice, the Shirley® team welcomes enquiries at any stage of the certification process.
Learn more through the Shirley® Events Programme
For businesses looking to act on the questions this article raises, the next step is to hear from someone who can translate certification requirements into practical guidance.
On 21 April, Shirley® experts are hosting a globally accessible webinar - ‘Closing the Loop on ORGANIC COTTON: Certification, Transaction Certificates and Digital Traceability with OEKO-TEX®’ - exploring the full certification process, the latest standards updates, and how Shirley® can support your business at every stage.
The session runs from 9:30–10:30 AM BST and is open to businesses across the textile supply chain.
Register here.
References
Chen, S., Zhu, L., Sun, L., Huang, Q., Zhang, Y., Li, X., Ye, X., Li, Y. and Wang, L. (2023) 'A systematic review of the life cycle environmental performance of cotton textile products', Science of the Total Environment, 883, p.163659. Available at: sciencedirect.com/science/article/abs/pii/S0048969723022799.
Environmental Justice Foundation (2018) The casualties of cotton. London: EJF. Available at: ejfoundation.org/news-media/the-casualties-of-cotton.
European Commission (2021) Study to support the development of the legal framework on substantiation and communication of green claims. Brussels: European Commission. Available at: europarl.europa.eu/RegData/etudes/STUD/2016/581922/EPRS_STU(2016)581922_EN.pdf.
Khamitov, M., Rajavi, K., Huang, D. and Hong, Y. (2024) 'Consumer trust: meta-analysis of 50 years of empirical research', Journal of Consumer Research, 51(1), pp.7–18. doi: 10.1093/jcr/ucad065.
Koussé, J.N.D., Ilboudo, S., Ouédraogo, A.R., Ouédraogo, J.C.R.P., Hunsmann, M., Ouédraogo, G.G., Ouédraogo, M., Semdé, R. and Ouédraogo, S. (2023) 'Self-reported health effects of pesticides among cotton farmers from the Central-West region in Burkina Faso', Science of the Total Environment, 895, p.165144. Available at: pmc.ncbi.nlm.nih.gov/articles/PMC10522852.
Morin, G. et al. (2025) 'Environmental sustainability of cotton: a systematic literature review of life cycle assessments', Science of the Total Environment. Available at: sciencedirect.com/science/article/pii/S2666154325004405.
Wicker, A., Schmall, E., Raj, S. and Paton, E. (2022) 'That organic cotton T-shirt may not be as organic as you think', The New York Times, 12 April. Available at: https://www.nytimes.com/2022/02/13/world/asia/organic-cotton-fraud-india.html.
Yalcin-Enis, I., Boz, E.C. and Yalcin, B. (2022) 'The impact of organic cotton use and consumer habits in the sustainability of jean production using the LCA approach', International Journal of Environmental Research and Public Health, 19(18). doi: 10.1007/s11356-022-22872-6.
