Red 40 (Allura Red): Side Effects, Hyperactivity, and Health Concerns
Updated: February 2026
Regulatory and Safety Profile of Allura Red AC (FD&C Red No. 40)
Allura Red AC, also known as FD&C Red No. 40, is a synthetic color additive or food dye that is widely used in food, drugs, and cosmetics. In the United States, color additives are subject to a strict system of approval by the FDA. Red 40 is a certified color, meaning that each batch must be tested by the manufacturer and the FDA to ensure its purity and safety before it can be used in products sold in the U.S.
Common Uses in Consumer Products
Red 40 is one of the most commonly used food dyes, lending a vibrant red color to a vast array of products, including beverages, candies, cereals, and dairy products. Its stability across a range of temperatures and pH levels makes it a versatile choice for food manufacturers. It is also used in pharmaceuticals to color medications and in cosmetics for products such as lipstick and blush.
Health Considerations and Controversies
- Hyperactivity in Children: The potential link between artificial food dyes, including Red 40, and hyperactivity in children has been a subject of debate and research for several decades. Some studies, notably a 2007 study conducted by researchers at the University of Southampton, have suggested that a mixture of certain food dyes and sodium benzoate could increase hyperactivity in some children. However, the FDA has concluded that a causal relationship has not been established for children in the general population who have not been diagnosed with attention-deficit/hyperactivity disorder (ADHD). The agency acknowledges that for certain children with ADHD and other problem behaviors, the evidence suggests that their condition may be exacerbated by exposure to a variety of substances in food, including, but not limited to, artificial food colors.
- Allergic Reactions: While rare, some individuals may experience allergic reactions to Red 40, with symptoms such as hives and swelling. These reactions are typically mild and resolve on their own.
- Carcinogenicity: Red 40 is manufactured from petroleum and has been tested for its potential to cause cancer. The FDA has reviewed the available data and has concluded that Red 40 is not carcinogenic.
Consumer Guidance and Labeling
The FDA requires that all certified color additives be listed by their common or usual name in the ingredient list of food products. Consumers who wish to avoid Red 40 should look for 'Red 40' or 'FD&C Red No. 40' on the label. Many food manufacturers now offer products made with natural colors derived from fruits and vegetables as an alternative to synthetic dyes.
In Summary: The most important thing about Red 40 (Allura Red): Side Effects, Hyperactivity, and Health Concerns is getting the basics right. Apply the tips above and you will avoid the most common pitfalls.
Related guides: How To Read Food Labels For Additives And Preservatives , Food Additives Children Behavior Hyperactivity Risks , Sodium Nitrite Preservative Health Risks Side Effects , Sorbic Acid Sodium Sorbate Preservatives Health Risks Side Effects
Related guides: Sodium Benzoate Vitamin C Benzene Formation Risk , Sodium Benzoate Side Effects Health Risks , Sodium Nitrite Nitrate Health Risks Processed Meat , Bha Bht Preservatives Health Risks Side Effects
Related guides: High Fructose Corn Syrup Health Risks Effects , Aspartame Sucralose Artificial Sweeteners Health Risks Side Effects , Aspartame Side Effects Health Risks Dangers , Index
Frequently Asked Questions about Red 40 (Allura Red): Side Effects, Hyperactivity, and Health Concerns
Is Red 40 (Allura Red): Side Effects, Hyperactivity, and Health Concerns suitable for beginners?
Yes, absolutely. Our guide to Red 40 (Allura Red): Side Effects, Hyperactivity, and Health Concerns explains all basics clearly.
How much does Red 40 (Allura Red): Side Effects, Hyperactivity, and Health Concerns cost?
Costs vary depending on the provider. A comparison is always worth it.
Where can I find more information?
Right here in our expert area for Food Additives & Preservatives Guide.