You know the moment. Your kid is holding a box of something bright red in the grocery store. Cherry candy, a red drink, cereal that looks like it glows. You flip the box over. The ingredient list is long, and there it is: Red 40.
Most of us buy these foods without thinking twice. But there are real questions about this dye, and you deserve to know what they are.
This article covers what Red 40 is, what Europe does about it, and what one well-known study found. No scare tactics. Just the facts, so you can decide for yourself.
What Red 40 Is
Red 40, also called Allura Red AC or E129, is one of the most widely used color additives in American foods, drinks, and candy. It makes food look bright red. It does not add flavor. It does not add nutrition. It is there to make food look fun.
That is the first thing worth knowing: the color is cosmetic. Your child does not need it. It is there to sell the product.
Why Europe Labels It Differently
Here is something that surprises most parents. In the European Union, foods that contain certain artificial dyes — including Allura Red — must carry a warning label. The label says the color may have an adverse effect on activity and attention in children. You can read how Europe handles this on the EFSA food colours page.
Think about that. The same dye sits in American candy with no warning at all. In Europe, parents get a heads-up on the package.
The Southampton Study
The EU rule did not come from nowhere. In 2007, a team led by McCann published a study in The Lancet — the well-known Southampton study. They gave children a mix of artificial colors plus a preservative called sodium benzoate, and they saw more hyperactivity in the kids who drank the mix. You can look up the study on PubMed.
Be honest about what this means and what it does not. The study tested a mix of colors, not Red 40 alone. It does not prove that Red 40 by itself causes hyperactivity in any given child. But it is a serious study in a serious journal, and it is part of why Europe added the warning.
Regulators Do Act, When the Evidence Builds
Some people say regulators never change their minds. That is not true. In January 2025, the FDA revoked authorization for a different dye, Red No. 3, in food and ingested drugs. Companies have to comply by 2027 and 2028.
That matters because it shows the pattern: evidence builds over years, and then the rules change. Red 40 has not been revoked. But groups like the Center for Science in the Public Interest have been pressing the FDA for years to take a harder look at food dyes. Petitions and pressure from groups like this are often what move slow agencies.
The Real Question to Ask
When you see Red 40 on a label, ask one simple question: is this food worth it without the color? If the answer is yes, you can look for a version without the dye. If the answer is no — if the color is the whole point — that tells you something about the food.
What You Can Do
You do not need to panic. You need a plan for the grocery aisle.
- Look for "Red 40", "Allura Red", or "E129" on ingredient labels. Those are the same dye.
- The brightest red, orange, and yellow candies, drinks, and cereals are the usual suspects. If it glows, read the label.
- If your child seems more wired after certain snacks, try cutting the dyed foods for a couple of weeks and see if anything changes. That is your own experiment, not a diagnosis.
- There are brands that use fruit and vegetable colors instead. They cost a little more sometimes, but they exist.
Sources
- FDA: Color Additives — Information for Consumers
- EFSA: Food Colours
- PubMed: search for the 2007 Southampton study on food colors and hyperactivity
- Center for Science in the Public Interest
This is general information, not medical advice. Talk to your doctor about your own health.