Food companies have two years to get red dye No. 3 out of their products. But other synthetic dyes have also raised concerns, because of behavioral issues in kids. Here's what parents need to consider.

For decades, FD&C Red No. 3 has added its vivid cherry-red hue to candies and cupcakes—but its risks have been debated just as long.

The Food and Drug Administration has said it is banning the use of Red No. 3, a synthetic dye that has long been used in the U.S. to color certain foods, such as candies and colored beverages, as well as some oral medicines and supplements.