File on 4 Investigates

BBC Radio 4

News-making original journalism documentary series, investigating stories at home and abroad.

  1. JAN 20

    Thin on Information? Hair loss drug Finasteride

    File on 4 Investigates whether the risks associated with the popular hair loss drug Finasteride are understood, after a 2024 review by UK drug safety regulator the MHRA prompted by a lack of awareness of the drug’s side-effects. Finasteride’s most common side effects are reduced libido and erectile dysfunction, affecting more than one in a hundred patients. Some people also report low mood and suicidal thoughts. As Johnny I'Anson discovers some hair loss clinics are failing to adequately warn customers at the consultation stage of the sexual side effects assocated with Finasteride. The drug, which is highly effective at halting hair loss, is only available by private prescription for hair loss purposes. But File on 4 Investigates discovers influencer accounts on the social media site TikTok promoting finasteride, also offering discounts for Finasteride with Manual, a popular UK men's health company. A lawyer expert told us that the videos we found constituted advertising. As a prescription-only medicine, it’s illegal to advertise finasteride to the public like this. This programme flagged the videos to TikTok, and they have since been removed. The company has also banned three of the accounts promoting the drug, saying they breached its rules. Manual said it was not involved in the making of the influencers’ videos. Presenter: Johnny I'Anson Producer: Rob Byrne Technical Producer: Richard Hannaford Production Co-ordinator: Tim Fernley Editor: Tara McDermott Details of organisations offering help and support with mental health are available at bbc.co.uk/actionline

    38 min
  2. 12/16/2025

    Firefighting's forever chemical legacy

    Industrial firefighting foams are an essential part of on-site safety in UK factories. But for decades some of these familiar canisters contained potentially dangerous, toxic chemicals. File on 4 Investigates discovers that 3M the multi-billion dollar chemical company responsible for producing the chemicals knew about the risks as early as the 1960s because their own internal studies on animals and tests on workers indicated a possible increase in rates of cancer. Despite this, the company failed to warn its workers of the dangers associated with using the foams for decades and was involved in an environmental accident at one of its sites that led to the chemicals being released into a Welsh river. The programme obtained never seen before documents showing the regulator warning the company it thought it had committed an offence but choosing not to prosecute it. In 2004, with evidence of the risks to the environment of the two specific forever chemicals PFOS and PFOA, a report commissioned by the government recommended any remaining firefighting foams containing the chemicals be incinerated. But we discover in the years after that companies struggled to dispose of legacy stock of foams, and, appearing unaware of the unofficial advice, discharged them straight into the sewer with no treatment, in one case with permission from the water company. 3M said that the health and safety of its workers and their families were “critical priorities" for the company. Reporter: Esme Stallard Producer: Anna Meisel Technical Producer: Richard Hannaford Production Coordinator: Tim Fernley Editor: Tara McDermott

    38 min

Ratings & Reviews

4.2
out of 5
33 Ratings

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News-making original journalism documentary series, investigating stories at home and abroad.

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