Offit urged parents to be cautious.
"The way we work in this country ... when a paper comes out, we tend to take it as fact," he said. "We should wait until we see if this is reproduced."
Rossignol agreed that further study is needed.
"This is not a cure for autism or anything like that," he said. "It may be an adjunct and be helpful, but it's certainly not going to cure anybody."
ABC News' Michelle Schlief contributed to this report.