Plenty of celebrities have expressed their support for supplement giant AG1 - but an investigation has dug up some questionable details about the company's founder.

Founder Chris Ashenden has resigned amid a Newsroom investigation that raised questions over his criminal history and unpaid fines and reparations by his now-defunct firms. 

Newsroom Pro managing editor Jonathan Milne says Ashenden's refusal to be interviewed set off journalistic 'alarm bells'.

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