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The peptide-testing industry has seen a significant surge in demand, with laboratories testing thousands of unregulated substances claiming to support weight-loss and wellness. This growth is largely driven by the injectable peptide craze, with experts warning about the lack of reliable safety data and quality control.Peptides are short chains of amino acids, which can be found naturally in the body or made synthetically in laboratories. They include active ingredients in prescription weight-loss drugs, such as Wegovy, as well as experimental compounds pushed online by the booming biohacking and anti-ageing industries.Laboratories, such as Finnrick in Texas, have reported a substantial increase in testing requests, with around 60,000 samples processed annually, including roughly 2,000 orders from the UK since 2024. About a third of the products analysed failed basic quality checks, with issues including incorrect identity, purity, and quantity.Experts, including Dr. Luke Turnock and Peter Magic, have highlighted the risks associated with these unregulated substances, including potential long-term harms such as increased cancer risk and damage to organs. The large profit margins have also drawn nefarious actors into the supply chain.The UK is a significant market for peptides, with 2,000 testing orders since 2024, tied with Canada for third place globally. The Royal Pharmaceutical Society's Prof Amira Guirguis emphasized the need for oversight, traceability, and quality assurance in the peptide market.