Sanitarium is refusing to comment on its decision to remove Weet-Bix from The Warehouse shelves, but is said to be co-operating with the Commerce Commission.

Sanitarium will no longer supply Weet-Bix to the retailer from September 30, citing supply issues. The Warehouse had become well-known for selling a 1.2 kilogram family pack for $6.

Meanwhile, at supermarkets, the price ranges from $7 on special to more than $9.

The Warehouse took to social media on Thursday night, calling for customers to “share their thoughts” to help get Weet-Bix back on shelves.

The Commerce Commission also got involved after The Warehouse wrote and asked it to investigate.

A commission spokesperson said it had contacted Sanitarium to inquire about Weet-Bix supply constraints.

“It will follow-up with a letter requesting further information from Sanitarium today. Our priority is to deal with these directly with the parties involved, and we have no plans to make any further comment at this stage.”

The Warehouse chief executive Nick Grayston said Weet-Bix had been available at the retailer since 2021.

“We are by far the cheapest and most reliable in the market on this, and we think this is a big loss for our customers.

“Sanitarium have told us that they have got a shortage of Weet-Bix, but rather than rationing it to everyone they’ve cut us off completely. We have asked them to re-consider on several occasions.”

He said The Warehouse had been overwhelmed with the support it had received from customers and the public.

“Our supply is flying out the door as customers have flocked to grab our bargain $6 Weet-Bix and we expect to be out of stock sooner than initially expected.

“We’re going to keep fighting to keep the essentials affordable.”

Sanitarium was established by the Seventh-day Adventist Church in 1898 to promote and produce plant-based health foods..