ill Turnbull has tried cannabis to ease the effects of cancer.
The former BBC Breakfast presenter announced last March that he had been suffering from "incurable" prostate cancer since November 2017 and he's chronicled his battle against the disease in a new documentary, "Bill Turnbull: Staying Alive", which will include him sampling "unconventional" treatments, including the drug.
A source told The Sun newspaper's Bizarre TV column: "This documentary shows Bill's willing to do anything in a bid to beat the disease.
"In this case it includes him trying a treatment which is considered unconventional -- and even controversial. But there is much more to the show, including showing the effect his cancer has had on his family."
Elsewhere in the Channel 4 documentary - which will air next month - Bill also speaks with Nick Robinson, Sian Williams and Stephen Fry about their own battles with cancer, as well as following the 63-year-old star as he throws himself back into work to regain control of his life.
Bill - who has three adult children with wife Sarah - previously admitted he asked to stop chemotherapy when the side effects got too much.
The presenter - whose cancer has spread to his pelvis, hips, spine and legs - felt "depressed" and it left him with "crushing fatigue", which he couldn't bare anymore.
Speaking last October, he said: "After the eighth round of chemo in July, I asked the consultant to release me from the treatment.
"I just couldn't bear it any longer. We ended up doing one more, and then called it a day.
"Each round felt worse. I kept my hair, more or less, but lost my sense of taste. I had days when all I could do was lie down and wait for the crushing fatigue and nausea to pass.
"It felt as if the chemo was now taking on a character of its own, like some malevolent gremlin.
"It would take me on. Grind me down. During the bad phases, I wondered if I'd ever recover from feeling sick, tired and depressed."