What is red 40 dye used for?

Red 40 dye, also known as Allura Red AC, is a synthetic food coloring commonly used to enhance the color of various food and beverage products, including candies, soft drinks, and baked goods. It is also found in cosmetics, pharmaceuticals, and some personal care products. The dye is popular for its bright red hue and is valued for its stability and ease of use in manufacturing. However, its use has raised concerns about potential allergic reactions and hyperactivity in some individuals, leading to calls for regulation and labeling.