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Puberty blocker trial will help reduce harm, says Cass report author

Published June 23, 2026 · Updated June 23, 2026 · By Sandra Garcia

Puberty Blocker Trial Aimed at Minimizing Risks, Says Cass Review Author

Puberty blocker trial will help reduce harm by providing critical data on the long-term effects of puberty-delaying medications for children exploring their gender identity, according to Hilary Cass, the lead author of a recent review. The trial, which is set to begin recruiting participants in August after a temporary pause in February, will focus on assessing the safety and efficacy of these drugs in young individuals. Cass, a renowned expert in gender care, argued that the trial is essential to ensure that the treatment aligns with the best interests of patients, especially when irreversible decisions like hormone therapy are involved.

The Scope and Design of the Trial

The proposed study, spearheaded by researchers at Kings College London (KCL), includes strict age guidelines to protect participants. Female children born in the UK will be eligible to join the trial from the age of 11, while male participants can start at 12. The minimum age for the trial has been raised to 14, reflecting a balance between accessibility and safety. This approach aims to address concerns about the potential risks of puberty blockers while allowing vulnerable groups to access treatment early. The trial will also incorporate comprehensive monitoring protocols to track participants' physical, emotional, and social development throughout the process.

Controversy and Policy Shifts

The puberty blocker trial will help clarify the debate surrounding its use in gender care, especially after a 2024 government decision imposed a nationwide ban on both private and NHS prescriptions for the same purpose. While the ban was implemented to ensure clinical evidence underpins treatment decisions, it has sparked controversy among advocates who argue that children as young as 11 are still receiving testosterone, an irreversible hormone that is not recommended for under-16s. Cass emphasized that the trial will help resolve these uncertainties, ensuring that medical guidelines are based on rigorous data rather than anecdotal evidence or political pressures.

Despite the ban, some clinics continue to prescribe puberty blockers for children with gender dysphoria, highlighting the urgency of the trial. The Cass report, which formed the basis for the government's decision, outlined the need for further research but also acknowledged the importance of timely interventions. The trial will help bridge this gap by providing empirical evidence on the drugs' impact, potentially influencing future policies and practices. As the trial progresses, it will help establish a framework for safe, evidence-based gender care that balances innovation with caution.

Legal challenges are currently being mounted against the trial, with groups like Bayswater Support Group asserting that it does not fully address the risks of irreversible harm. These critics argue that the trial lacks sufficient data on long-term effects and that it may not resolve key questions about the drugs' safety. However, Cass and her team maintain that the trial will help uncover these insights, allowing healthcare providers to make informed decisions. The debate underscores the complexity of gender care, where medical, ethical, and political considerations intersect.

Health Secretary James Murray has expressed support for the trial, stating that clinical evidence is vital in shaping health policies. “I’ve felt uneasy about some of the challenges raised, but following the most robust assurances about safeguards, basing decisions on scientific data is the right approach,” he said in a recent statement. The trial will help reinforce this stance, offering a clear pathway for evidence-based decision-making. Meanwhile, the Conservative Party has called for a Commons vote to allow politicians to weigh in on the issue, emphasizing the need for public accountability and transparent guidelines.

As the trial will help gather data, it is expected to inform not only UK policy but also international standards for gender care. The Cass report, which highlighted the importance of clinical trials in reducing harm, has been a cornerstone in the ongoing dialogue about puberty blockers. Advocates like Chay Brown of TransActual have welcomed the trial, arguing that it will help ensure children receive timely and holistic care based on informed consent. The trial will help set a precedent for how medical interventions are evaluated, ensuring that both risks and benefits are thoroughly explored before widespread implementation.