You are correct, Iodine is not a nutrient that you can track at Sparkpeople, and therefore it is not listed in our nutrition tracker.
Our primary database comes from the USDA Food Database. This database does not include iodine and is not on their listing.
Iodine is a "tricky" nutrient to track since the amount in food can very greatly depending on the growing condition and the amount in the soil of the region where the food was grown.
This article will give you more on iodine as well as a listing of high iodine foods. I encourage you to talk in greater detail with your doctor about your specific needs and supplement needs based on your medical condition. ods.od.nih.gov/factsheets/Iodine-HealthPro
Your SP Registered Dietitian Nutritionist