Joe Rogan was left stunned when Mel Gibson revealed the controversial way his friends treated their terminal cancers.

On the latest episode of the Joe Rogan Experience, Gibson said three of his friends were diagnosed with stage four cancer and all had 'some serious stuff going on.'

Gibson claimed they took ivermectin and fenbendazole, drugs usually given to treat infections caused by roundworms, threadworms, and other parasites. 

The Lethal Weapon star then sensationally claimed all three friends 'don't have cancer right now.'

'This stuff works, man,' he added.

There is some early evidence that using ivermectin in combination with other therapies can help shrink tumors, but that has not been stood up by larger trials.

Some research has also suggested fenbendazole, known by its brand names Panacur and Safe-Guard, stops the growth of cancer cells, even some of the most aggressive types.

Experts cautioned that while early research is encouraging, fenbendazole can cause serious side effects. They also warn that shunning mainstream treatments could be deadly.

Gibson said: 'I don't believe that there is anything that can afflict mankind that hasn't got a natural cure for it. It just makes sense to me. 

'I couldn't prove that, but I just believe that. There's got to be something that cures things.'

Referring to both drugs, Rogan added: 'This stuff does work, which is strange because it's not profit.'

He also acknowledged both drugs are controversial and suggested health authorities may be pushing standard cancer treatments because they are more profitable.  

Rogan added: 'When you hear about things that are demonized and they turn out to be effective, you always wonder, "What is going on here? How have our medical institutions failed us so that things that do cure you are not promoted because they're not profitable?"'