Concerned parents have expressed fears for the lives of dozens of sick Queensland children following raids on a South Australian cannabis oil producer.

Police yesterday raided Jenny Hallam's property at Hillier and seized chemicals and other substances for forensic testing, but no charges have yet been laid.

The raids sparked outrage as Ms Hallam supplied cannabis oil products, at no cost, to hundreds of sick Australians.

Steve Peek from Brisbane said his eight-year-old daughter Suli relies on Ms Hallam's cannabis oil to control her seizures.

"We only have enough to last until next week," he told the ABC.

"Yesterday, to try and stretch it out, we didn't give her the midday dose and at a quarter to six last night she started having seizures."

The vocal campaigner for medicinal cannabis contacted South Australian police yesterday.

"They realise they've done the wrong thing but they had no choice because a complaint had been made," Mr Peek said.

He said police suggested that he contact the South Australian ombudsman.

Rebecca Brisdon, who is a community advocate for medicinal cannabis users on the Sunshine Coast, said she knows of dozens of Queenslanders who rely on the cannabis oil produced in South Australia.

"Some patients could deteriorate within 24 hours, or face death, without it," she said.

"Bulk supplies are not sent out, so these patients could run out in a matter of days.

"In a perfect world, the South Australian authorities will return the oil. That is our major concern right now, as these children rely on it."

In Queensland, new laws were passed in October which will broad give doctors broader powers to prescribe medicinal cannabis to certain patients from March 2017.

But those who need it now say legal cannabis oil is too expensive and is not on the Pharmaceutical Benefits Scheme.