The last of those retailers had been contacted yesterday morning as attempts to contact the company late last week by phone had not been successful, a spokesman said.
All four suppliers had stated they would be stopping supply of Frenzy in New Zealand. The Ministry had written to the distributor but has not yet been able to talk with it.
"Once we have we done so we will have a better idea of how much product is in the country," the spokesman said.
An employee who answered the phone at the Auckland retailer's premises referred the Herald to the company's director, who did not respond to a request for an interview.
Late yesterday the website of Predator Nutrition, the company that distributes Frenzy in the United Kingdom, was still offering to ship the product to New Zealand.
Prior to the ban on Frenzy the Herald purchased a tub from a second New Zealand-based supplier. Staff at the store said they had been instructed not to comment to the media and referred the newspaper to one of the company's directors. The director declined to answer any questions about Frenzy.
"To be honest, I have no comment at all to say to you. No offence intended. Best of luck to you though."
Moe Moses, the owner of supplement chain Xtreme Nutrition, described the banning of Frenzy as "brilliant" news. Although Xtreme stores stock the products, retail staff are instructed to advise customers not to buy them.
Next article: The good oil on bad supplements
In a hidden camera operation staff at two Xtreme stores refused to sell pre-workout supplements to an undercover female reporter. "We don't support them," Mr Moses said. "It is as simple as that."
