Red Dye 40 keeps its color for a long time, but it can break down into its components when the food it's in goes through changes in temperature or pH—either before or after you eat it.

Red Dye 40 (also known as Red 40) is the most widely used synthetic food coloring used in the United States. More than 36,000 American food products — including candies, sodas, and cereals ...

Foods that aren’t red can sometimes contain Red 40. However, the FDA mandates the dye be listed by name on food and product labels. Red 40 can cause allergy-like reactions in some people, such ...

Red dye No..40, aka Allura Red, is one of the most commonly used synthetic food dyes in the U.S. and Canada, Dr. Kelly Johnson-Arbor, a toxicologist at MedStar Health, tells Yahoo Life.

Red dye 40 is a synthetic preservative used to color food products red. It’s also known as Allura Red AC, or C18H14N2Na2O8S2, if you go by molecular formulas.

"I do think with Red Dye 40, there is potential for great concerns, whether that's cancer or behavioral issues," Akbari said. "My concern is regulating it on a state level.

The U.S. Food and Drug Administration banned Red No. 3 last week, a dye that gives food and drink a bright, cherry-red color. The removal is in response to a color additive petition filed in 2022 ...

The U.S. Food and Drug Administration banned Red No. 3 last dye, leading those to think Red Dye No. 40 could be next. How are these dyes different?

"I do think with Red Dye 40, there is potential for great concerns, whether that's cancer or behavioral issues," Akbari said. "My concern is regulating it on a state level.