Potassium iodate

Food additives Europe numbers: E917 
Potassium iodate (KIO3) is a food additive with a very specific and crucial function: protecting the thyroid gland from radioactive iodine exposure. Here's a breakdown of its properties and limited use in food:

Why Potassium Iodate in Food?

• Thyroid protection: Potassium iodate is not a common food excipient in the usual sense (like adding flavor or texture). It's specifically added to table salt (iodized salt) in some countries to act as a preventative measure in case of radiological emergencies.
• Saturation effect: The thyroid gland naturally absorbs iodine. By consuming small amounts of potassium iodate through iodized salt, the thyroid becomes saturated with stable iodine. This reduces its uptake of radioactive iodine isotopes that might be released during a nuclear accident, potentially preventing thyroid cancer.

Limited Use Cases:

• Iodized salt: The primary application of potassium iodate in food is fortifying table salt with iodine. This is not universally practiced, but some countries have implemented mandatory or recommended iodization programs due to the potential benefits in case of a nuclear emergency.
• Not a flavoring or texturizing agent: Unlike many food excipients, potassium iodate doesn't play a role in flavor, texture, or preservation of food.

Safety and Regulations:

• Generally recognized as safe (GRAS): Potassium iodate is generally recognized as safe (GRAS) by regulatory bodies like the US FDA for use in iodized salt at recommended levels.
• Importance of following guidelines: Consuming excessive amounts of iodized salt can be harmful, so it's crucial to follow recommended daily intake levels.

Overall:

Potassium iodate has a unique role in food fortification. It's not a common food additive for general purposes but serves a critical public health function in some regions by providing a preventive measure against potential radioactive iodine exposure. It's important to note that iodized salt is not a substitute for other public safety measures in case of a nuclear emergency.