The investigation began after UK Anti-Doping identified website linked to the Bolton area that was suspected of selling performance-enhancing steroids and other illegal medicines. 

Tim Duffield, MHRA head of intelligence, said: ‘This was a well-organised operation that put people at real risk. Medicines bought outside regulated channels can be unsafe, ineffective or fake. 

‘Our investigators worked hard to break up this criminal network and bring those responsible to justice. These convictions are just part of the MHRA's ongoing work to tackle the illegal trade in medicines and protect public health.'

During enforcement action, officers seized more than 130,000 doses of steroids and unauthorised medicines that were being sold by mail order. These included products such as tamoxifen, finasteride and modafinil. 

Following a detailed investigation, several individuals were charged with offences including conspiracy to supply controlled drugs, supplying unauthorised medicines.