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Doctors are calling for better regulation of health supplements, as demand surges during the Covid pandemic.
Sales in New Zealand supermarkets reached 130-million dollars this year by September.
However, some say they're expensive, we don't need them, and they can be dangerous.
Medical Association chairman, Dr Alistair Humphrey, told Kate Hawkesby people are wasting their money taking supplements.
“They haven’t been tested and so we have no idea whether they work or not, potentially they can be harmful. Their claims are quite extreme.”