Additive guide
Is Red 40 bad? What the science actually says
By the HealthierCart team ·
What is Red 40?
Red 40 is a petroleum-derived synthetic azo dye — the most-used food color in the U.S. It adds a bright red hue to candy, drinks, and cereal but has no nutritional purpose or flavor.
| Also known as | Allura Red AC, FD&C Red No. 40, E129 |
|---|---|
| E-number | E129 |
| U.S. status | Approved / permitted by the U.S. FDA |
| EU status | Permitted with a mandatory warning labelPermitted in the EU but requires a hyperactivity warning label (Reg. 1333/2008 Annex V). |
| HealthierCart view | Limit intake |
| Commonly found in | Brightly colored candy, sports and fruit drinks, breakfast cereals, frostings, flavored snacks, and some medications. |
So, is Red 40 bad for you?
Not acutely toxic at the levels found in food, and the FDA still approves it. The real, evidence-backed concern is behavioral: synthetic dyes are associated with attention and activity effects in some sensitive children — which is why the honest move is limiting it for kids, not panicking over a single serving.
What regulators actually say
The U.S. FDA lists Red 40 as an approved color additive. The EU permits it but requires a label warning that it 'may have an adverse effect on activity and attention in children.' California's OEHHA reviewed the neurobehavioral evidence in 2021, and California's 2024 School Food Safety Act (AB 2316) bans it from foods served in public schools.
Where you'll find it
Brightly colored candy, sports and fruit drinks, breakfast cereals, frostings, flavored snacks, and some medications.
Red 40: frequently asked questions
- Is Red 40 banned anywhere?
- It is not banned in the U.S. or EU, but the EU requires a child-hyperactivity warning label, and California's 2024 School Food Safety Act bars it from public-school foods. It remains widely approved elsewhere.
- Does Red 40 cause hyperactivity?
- Some children appear sensitive. California's OEHHA 2021 review linked synthetic dyes to activity and attention effects in some kids, but not all children react. Dose and individual sensitivity matter — a single serving is very different from daily heavy intake.
- How do I avoid Red 40?
- Check the ingredient list for 'Red 40', 'Allura Red', or 'FD&C Red No. 40'. Products colored with beet juice, paprika, or annatto use natural alternatives. Scanning a barcode in HealthierCart flags it automatically.