Something pregnant women have been told to take is linked to autism in a new study being taken with a grain of salt.

FOX's Chris Foster reports:

Very high levels of folate in mothers' blood at the time of delivery is linked to a higher risk of autism in their kids years later.

Women have been advised to take supplements of folic acid, a synthetic version of folate, to prevent birth defects. It's been added to grain products since the late 90's for that reason.

And this study's author says there is no reason for that to change, just that more research is needed.

The study looked at just a few families, at one hospital. It was presented at an autism research conference in Baltimore.

Chris Foster, FOX News.