There is no evidence of an increased cancer risk from plans for bakers in New Zealand and Australia to fortify their bread with folic acid, a leading scientist says.

A still unpublished study "shows that there is no increase in cancer risk with high-dose folic acid," said Otago University Professor Murray Skeaff, a human nutrition specialist.

Prime Minister John Key has said the fortification of breads with folic acid is likely to go ahead in September but may be stopped soon after.

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