The New Zealand Food Safety Authority has seized several tonnes of manuka honey in Timaru.
The agency says an investigation is underway into the composition of the product, which was in the early stages of being processed for the domestic and export markets.
FSA assistant director Justin Rowlands says the honey was brought to the agency's attention by a Timaru packhouse processing the product for sale.
Mr Rowlands says the investigation is about protecting market integrity for exporters and the FSA is solely concerned about product composition. He says the honey poses no food safety issues for consumers.