The Therapeutic Goods Administration (TGA), which regulates sunscreens in Australia, told the ABC it was recently made aware of Mr Drewitt's previous business record.

However, the TGA told the ABC it did not directly regulate SPF testing by third-party labs such as PCR.

Instead, it relied on self-certification by sunscreen manufacturers that their products met all regulatory requirements.

"As such, the TGA does not hold information regarding whether PCR is engaged by a majority of sunscreen sponsors," a spokesperson said.

"The TGA is investigating the Choice findings and will take regulatory action as required," the spokesperson said.