A Guernsey registered company has had its Cambridgeshire based factory closed down after 'serious concerns' about the drugs it produces.
Importation of the drug GcMaf into the island has also been banned from today.
GcMaf is a blood product that claims to treat a range of conditions, including cancer, HIV and autism.
The UK's Medicines and Healthcare Products Regulatory Agency (MHRA) did an unannounced inspection of the production site in Milton, Cambridgeshire today after concerns from the medicines regulator in Guernsey.
A Guernsey company which makes an unlicensed drug has had its factory closed amid fears materials used aren't fit for human consumption.
There are concerns the product may be contaminated and it was decided that the production site doesn't meet Good Manufacturing Practice.
More than 10,000 vials were seized and production of the unlicensed medicine has stopped.
People are now being warned not to buy it it.
Locally, Health Authorities are also warning islanders that importing the drug GcMaf is now illegal.