Weet-Bix will soon be back in trolleys at the Warehouse.

Sanitarium has reversed a decision announced last week to withhold supply - although still stocking supermarkets.

The Warehouse's $6 charge for Weet-Bix is lower than other outlets.

Chief Product Officer Tania Benyon says despite Sanitarium's change of heart, they still want the issue looked into.

"What led Sanitarium to this decision, and just to make sure that the new grocery commissioner and the Commerce Commission are able to ensure that there is fairness."

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