What Is Carrageenan in Ketchup, and Is It Safe?

What Is Carrageenan and Why Is It in Ketchup?

Carrageenan, listed on ingredient labels as E407, is a natural thickener extracted from red seaweeds such as Irish moss (Chondrus crispus). It has been used in cooking for centuries, particularly in traditional Irish and coastal European desserts. In modern food production, it is purified into a powder that thickens and stabilises sauces, including some ketchups and tomato-based condiments.

Why Do Some Ketchups Contain Carrageenan?

Many premium ketchup brands rely on natural pectin from concentrated tomatoes for thickness. However, certain recipes—especially reduced-sugar, organic, or value-range sauces with a lower tomato content—add a small amount of carrageenan to:

• Give the sauce a thick, glossy texture that clings to food (e.g., chips or burgers).
• Prevent the watery part of the sauce from separating (a problem called syneresis).
• Maintain a consistent pour and mouthfeel across batches.

If your ketchup contains it, you will see it near the end of the ingredients list, often as "carrageenan," "thickener (E407)," or "stabiliser."

Is Carrageenan Safe to Eat?

Yes, food-grade carrageenan is approved for use across the European Union, the United Kingdom, and the United States. The European Food Safety Authority (EFSA) re-evaluated it in 2018 and confirmed it is safe at the levels used in food, setting a precautionary Acceptable Daily Intake (ADI). The UK Food Standards Agency (FSA) and the US Food and Drug Administration (FDA) also permit it as a food additive. Because carrageenan is a soluble fibre that your body does not digest, it adds essentially no calories.

Understanding the Controversy

You may have seen claims linking carrageenan to gut inflammation. These concerns stem from laboratory studies using a different, degraded substance called poligeenan, which is not permitted in food and is chemically distinct from food-grade carrageenan. Regulators such as EFSA and the FDA have repeatedly reviewed the evidence and concluded that food-grade carrageenan, as used in ketchup and other products, does not pose the same risks. For the general population, it is considered safe.

Who Might Want to Avoid It?

A small number of people choose to avoid carrageenan as a personal preference, often due to digestive sensitivity. If you wish to avoid it, check labels and opt for ketchups whose thickness comes purely from concentrated tomatoes. Many premium brands list only tomatoes, vinegar, sugar, and spices. For specific dietary concerns, consult a healthcare professional or a registered dietitian.

The Bottom Line on Carrageenan in Ketchup

Carrageenan is a natural red-seaweed thickener used in small amounts to give ketchup body and prevent separation. It is judged safe by EFSA and the FDA at food-use levels, and the scarier claims relate to a degraded chemical that is not allowed in food. If you would rather avoid it, choose a ketchup whose ingredients list only tomatoes, vinegar, sugar, and spices.