Scientists are to map Ozzy Osbourne's genetic code in a bid to find out how he is still alive after decades of drug and alcohol abuse.
The former Black Sabbath frontman is only one of a few people in the world to have his full genome analysed.
It is hoped the results from the £27,000 test, which takes three months, will provide information on how drugs are absorbed in the body.
Ozzy, 61, has lived a life that would presumably kill any ordinary person.
Even the singer himself cannot understand how he has survived this long, recently describing himself as a "medical miracle" after going on a "bender" for "40 years".
He has admitted drinking four bottles of cognac a day at one point, "blacking out, coming to again and carrying on".
Ozzy famously bit the head off a rat while performing with Black Sabbath and in 2003 broke his neck in a quad bike accident.
He also has a genetic disorder similar to Parkinson's disease and on at least one occasion has been committed to a mental institution.
Despite all his excesses, he is still with wife Sharon, who he once tried to strangle, and the couple have three grown-up children.
Now he may get some answers from US company Knome, which will use a blood sample to map his genome.
Nathan Pearson, director of research at the firm, said: "Sequencing and analysing individuals with extreme medical histories provides the greatest potential scientific value."
The results will hopefully help scientists understand why the bodies of hard-living rockers such as Ozzy, Keith Richards, Ronnie Wood and Iggy Pop are able to take more substance abuse than the average person.
