Iodine's natural cycle runs from ocean water to atmosphere to soil, which is why coastal regions tend to have iodine-richer soil than inland areas. We trace that cycle.

Iodine is a nutrient most people only think about once, if ever — but it plays a specific, well-documented role in the body. In coaching, I've learned that people stick with a routine when they understand why it works — so let's get into the why here.

What the Nutrient Does

Iodine enters the atmosphere primarily through evaporation from ocean water, then falls back to earth via rain.

Where This Shows Up in Practice

Soil iodine content generally decreases with distance from the coast and is further reduced by erosion and heavy rainfall over time.

Crops grown in iodine-poor soil will typically contain less iodine than the same crop grown in iodine-rich coastal soil.

Putting It in Context

As with anything in a wellness routine, the goal isn't to overthink it day to day — it's to understand it well enough that the routine makes sense to you.

Frequently Asked Questions

Can I get enough of this nutrient from food alone?
Diet is the primary source for most nutrients, iodine included, and dietary sources vary widely by region and food choices. A healthcare provider or registered dietitian is the right resource for questions about your specific intake.

Ryan Whitfield covers the chemistry and wellness-routine side of iodine supplementation for the Iodine Journal.

This article is for general educational purposes only and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease, and is not a substitute for advice from a qualified healthcare provider — especially if you are pregnant, nursing, taking thyroid medication, or managing a thyroid condition.