Jonathan Green, a psychiatry professor from Manchester University who specialises in autism, agreed there was “absolutely no basis” for the idea that silica water could cure or halt the symptoms of autism.
He added: “[Exley] is well known for these claims, that have no basis.”
Mr Green said Exley should “very definitely” declare his links to the company in his papers and called into question his bid to crowdfund research.
He said: “It’s unusual and suggests he can’t put forward a good scientific case for other forms of funding. The concern is it bypasses the peer review and critical assessment phases, which act as a check.”