Yellow 5 is one of the most widely used artificial food dyes, showing up in cereals, sodas, candy, sauces, yogurt, and even pet food. But it’s not limited to what you eat. This synthetic colorant, also known as tartrazine, appears in medications, cosmetics, shampoos, and household products. If you’re trying to figure out where it’s hiding, the list is longer than most people expect.
Foods That Commonly Contain Yellow 5
Yellow 5 gives products a bright lemon-yellow color, though it’s also blended with other dyes to create orange, green, and other shades. You’ll find it in a wide range of grocery store staples:
- Cereals and granola bars
- Sodas and fruit-flavored drinks
- Gelatin desserts (like Jell-O)
- Frosting and cake mixes
- Spice blends and seasoning packets
- Sauces, including mac and cheese powder
- Flavored yogurts
- Juices and juice concentrates
- Candy and chewing gum
It’s also added to food made for cats, dogs, fish, birds, and small rodents. The dye serves no nutritional purpose in any of these products. It exists purely to make food look more appealing.
Non-Food Products With Yellow 5
Yellow 5 is FDA-approved for use in foods, drugs, and cosmetics, which means it turns up in places you might not think to check. Common non-food products containing it include lipsticks, mouthwash, toothpaste, shampoos, detergents, and vitamin pills. The FDA permits its use both in products you swallow (like medications) and in those applied to the skin or around the eyes.
Prescription and over-the-counter medications frequently use Yellow 5 to color tablet coatings, capsule shells, and liquid formulations. If you’re trying to avoid it, checking the inactive ingredients list on your medication is just as important as reading food labels.
How to Spot It on a Label
Yellow 5 goes by many names depending on the country and the type of product. In the United States, food labels typically list it as “Yellow 5” or “FD&C Yellow No. 5.” In Europe, it appears as E102. Other names you might encounter include tartrazine, C.I. Acid Yellow 23, C.I. 19140, and Food Yellow No. 4. Cosmetics and industrial products sometimes use the designation “Tartrazine Lake,” which refers to a version of the dye mixed with a metal salt to make it insoluble.
In the European Union, any food or drink containing Yellow 5 must carry a specific warning: “Tartrazine (E 102): may have an adverse effect on activity and attention in children.” The U.S. has no equivalent warning requirement, though the FDA does mandate that Yellow 5 be listed by name on food labels rather than hidden under the generic term “artificial color.”
Why People Try to Avoid It
About 0.1% of the general population has a sensitivity to tartrazine. Reactions can include hives, itching, skin patches, and a feeling of suffocation. It was actually the first food dye ever reported to cause hives, back in 1959. Of all synthetic food dyes in the azo family, tartrazine triggers allergic responses most frequently.
The overlap with aspirin sensitivity is striking. Between 20% and 50% of people who are sensitive to aspirin also react to Yellow 5. Both substances inhibit the same enzyme involved in inflammation, which explains the crossover. People with asthma are also at higher risk. Symptoms from tartrazine sensitivity can come from eating it or from skin contact, and they range widely: migraines, blurred vision, sleep disturbances, anxiety, and general weakness have all been documented.
The Link to Hyperactivity in Children
A major 2007 study from the University of Southampton tested 153 three-year-olds and 144 eight-year-olds, giving them drinks containing mixtures of artificial food dyes (including Yellow 5) and the preservative sodium benzoate. The children who consumed the test mixtures showed significantly more hyperactive behavior compared to when they drank a placebo. The lead researcher, Professor Jim Stevenson, stated the study provided “clear evidence” that certain mixtures of food colors and preservatives can influence hyperactive behavior in children from the general population, not just those already diagnosed with attention difficulties.
This study was a key reason the EU adopted its mandatory warning labels. It’s worth noting the study tested dye mixtures rather than Yellow 5 alone, so isolating its individual effect is difficult. Still, it was influential enough to shift regulatory policy across Europe.
How Much Is Considered Safe
The FDA sets the acceptable daily intake for Yellow 5 at 5 mg per kilogram of body weight per day. For a 150-pound adult, that works out to about 340 mg daily. The European Food Safety Authority allows a slightly higher limit of 7.5 mg per kilogram per day. Both figures are derived by taking the highest dose that caused no adverse effects in animal studies and dividing by 100 as a safety margin.
Most people consume well under these limits, but children who eat a lot of brightly colored candy, cereals, and flavored drinks can get a proportionally higher dose relative to their body weight. If you’re concerned about intake, the most practical step is checking ingredient lists on the processed foods and beverages your household goes through most quickly.