Life & health · Established
Iodine travels in a familiar ingredient
Salt iodization uses carefully distributed iodine compounds to turn an everyday food ingredient into a vehicle for population nutrition.
THE MATERIAL THAT DOES THE WORK
Chemical form
Iodized salt is mostly sodium chloride with a small controlled addition of an iodine compound. Potassium iodate, KIO3, and potassium iodide, KI, are established fortificants; the product does not rely on loose elemental iodine.
Guidelines on Food Fortification with Micronutrients — Part III: Fortificants
- 01
Choose the carrier
Food-grade sodium chloride and an appropriate iodine fortificant are selected for local salt quality and distribution conditions.
- 02
Fortify and protect
Controlled mixing, batch checks, and suitable packaging help maintain an even and durable iodine content.
- 03
Monitor the program
Checks on salt and population iodine status guide program adjustments after the product enters everyday diets.
Guidelines on Food Fortification with Micronutrients — Part III: FortificantsIodine deficiency
Why it works
Iodine is an essential nutrient incorporated into thyroid hormones, and deficiency can disrupt development. Salt provides a familiar food vehicle for adding the micronutrient to diets across a population.
How it is made & used
Producers select a fortificant compatible with the salt's purity, moisture, and storage conditions. Controlled addition and mixing distribute it through batches. Quality assurance checks the iodine content, while packaging helps preserve it during transport and storage.
Guidelines on Food Fortification with Micronutrients — Part III: Fortificants
Inside the application
Salt iodization turns a familiar ingredient into part of an organized public-health program. WHO's guideline addresses the people who design, implement, and expand these programs, including policymakers and technical staff. Cooperation with producers connects a nutritional objective to the food supply that reaches households.
Limits & alternatives
Iodine can be lost when salt is damp, impure, poorly packaged, or stored under unfavorable conditions. Iodate is generally more stable than iodide. Fortification programs must also prevent excessive intake; population monitoring informs adjustments to the amount added.
Guidelines on Food Fortification with Micronutrients — Part III: FortificantsIodine deficiency
Part of a larger system
Salt iodization belongs alongside policies that reduce sodium consumption. WHO calls for fortification programs to align with efforts to reduce diet-related noncommunicable diseases. Both goals concern the composition of the food supply and population health.
Sources & further reading
- Guidelines on Food Fortification with Micronutrients — Part III: Fortificants ↗World Health Organization and Food and Agriculture OrganizationTechnical documentation · Source checked Where to look: Part III introduction, printed pp. 95–96 / PDF viewer pp. 3–4; §§5.3.1, 5.3.2.1 and 5.3.3, printed pp. 118–123 / viewer pp. 26–31.The iodine sections cover chemical forms, salt compatibility, stability, monitoring and excess-intake concerns.
- Iodine deficiency ↗World Health OrganizationReference explanation · Source checked
- Food fortification ↗World Health OrganizationReference explanation · Source checked
- Guideline: fortification of food-grade salt with iodine ↗World Health OrganizationTechnical documentation · Source checked
Sources and further reading. What the review labels mean