RESEARCHERS have warned that iodine levels in imported foods should be monitored after a health scare involving Bonsoy milk.

Twenty-five people who claim they developed illnesses because of high iodine levels in the soy milk filed a Supreme Court writ last week, seeking damages from Bonsoy's Australian distributors, the Herald Sun reports.

Dr Diana Learoyd of Sydney University said there was a "strong public health argument" to monitor the iodine levels in imported foods and commercially available seafood preparations.

Research, led by Dr Bronwyn Crawford, published in today's Medical Journal of Australia, details eight cases of people who suffered illnesses after taking Bonsoy.

One was a 38-year-old man who "drank Bonsoy in a takeaway coffee" and developed a thyroid condition that can cause heart attacks.

More are expected to join the action initiated by Maurice Blackburn lawyers.

Read more on the Herald Sun.