All those little ghosts and goblins are just a few days away from filling up their baskets with candy. For some parents, all that sugar is just the beginning of the health concerns.

More parents are reading the ingredient labels of food products to check for artificial colors and dyes that they swear have an effect on their children's behavior.

The FDA does test and certify dyes and requires them to be listed as an ingredient on food labels. By now, most parents have heard the claims that the coloring can trigger hyperactivity in children.

"I heard back in the day that red was dangerous," new mom Monica Fracht told consumer expert Amy Davis.

"We don't really partake that much in candies,” said another consumer. "It's a treat, just occasionally."

But dyes are in just about everything from cereal to fruit drinks. They're even in foods that aren't colorful, like marshmallows and white frosting.

The FDA has been looking into these dyes for years and found, while they're not toxic and don't cause hyperactivity in kids, the FDA concluded: "... for certain susceptible children with ADHD and other problem behaviors, the data suggest their condition may be exacerbated by... artificial food colors" because of a unique sensitivity.

In Europe, many food makers have replaced the artificial dyes with natural coloring because of the behavioral concerns.

The maker of M&M's, Mars and the Grocery Manufacturers Association told NBC News that the overwhelming majority of studies "confirm the safety of these artificial food colors"... and that they're always reviewing new studies to produce "the safest possible product." Mars says it’s "continuing to explore the use of natural colors".

The FDA research applies only to children who already have ADHD or behavioral problems.  The FDA says more research is needed, and it'll issue new findings about food dyes at the beginning of next year.