The following are the most common food colorings that have been reported to cause allergic reactions:

Tartrazine

Also known as FD&C Yellow Dye #5, tartrazine has been suspected as the cause of many reactions, including urticaria (hives) and worsening asthma and eczema.

A study published in 1976 in Clinical Allergy, looking at 140 asthmatics, showed a significant cross-reactivity between aspirin and tartrazine. A review of six studies published in 2001, however, found tartrazine did not negatively impact asthma in most individuals, but the authors also noted that firm conclusions could not be reached without more data. A more recent study published in 2009, looking at 26 people with asthma and sensitivity to aspirin, found they did not react adversely to tartrazine. Larger studies are needed.

Carmine

Carmine is a red dye food coloring made from a dried insect called Dactylopius coccus Costa, which can be found on prickly pear cactus plants. This coloring is also found in various cosmetics, drinks, red yogurt and popsicles. Reactions to carmine are truly allergic (IgE mediated) in nature.

According to a paper published in Acta Biomedica in 2019, it has sometimes caused urticaria, dermatitis and asthma. Anaphylaxis to carmine containing foods was noted following sensitization from a red-eye-liner.

Annatto

Annatto is a yellow dye food coloring made from the seeds of a South American tree, Bixia orellana. It is used in processed food, beverages and cheese. This additive has been found to cause allergic reactions, including anaphylaxis and urticaria.

Saffron

This yellow dye food coloring, obtained from the flower of the Crocus Sativa plant, has been reported as a cause of anaphylaxis.

A study published in the journal Allergy in 1997 found three of fifty workers in a saffron processing plant had developed allergic reactions to saffron.

Many other food colorings are less common, but possible, causes of allergic reactions. These include sunset yellow (yellow #6), amaranth (red #2), erythrosine (red #3), and quinoline yellow, among others.

Treatment

Severe reactions are treated much the same way as other food allergies. If reactions are severe, it may be necessary for a person to be prepared for a severe reaction (such as carrying injectable epinephrine and wearing a medical alert bracelet.

Otherwise, the mainstay of therapy for people with adverse reactions to food additives is the avoidance of the culprit food additive.