Supermodel Elle MacPherson has a revealed her secret for good health and it’s a little on the weird side.

The 51-year-old revealed she carries a urine tester kit in her handbag to test the pH balance of her body.

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MacPherson told the UK’s Standard that the tests allow her “to check that I’m in an alkaline state”.

“I believe that most ailments come from having an acidic body,” the mother-of-two added.

While DIY urine testing is not quite a wellbeing trend yet, it is well known that consuming alkaline-forming foods can reduce stress and inflammation and improve bone health.

For some context, a urine pH of 4 is regarded as strongly acidic, 7 is neutral (neither acidic nor alkaline), and 9 is strongly alkaline.

Macpherson also credited her intense exercise routine and balanced diet as helping her maintain ‘The Body’ she is famous for.

“I work out 45 minutes a day, six days a week, combining hiking, water skiing, swimming and running on the beach,” Macpherson revealed.

Macpherson’s eating habits revolve around “consistency and eating three healthy meals a day”.

“Having said that, red meat, wheat and dairy don’t work for me,” she added.

Macpherson, who was born in Killara, New South Wales, now resides in Miami with her husband, real estate tycoon Jeffrey Soffer.