The History of Lugol's Iodine: A 200-Year-Old Formula

Lugol's Solution was first developed in 1829 by French physician Jean Lugol as a stable, water-soluble form of iodine. Explore how a preparation from the 1800s became the standard liquid iodine supplement, and why it has barely changed since.

History explains a lot about why today's iodine products look the way they do. I like to think about supplement basics the same way I think about anything I'd pack for a long trip: it should hold up, and I should understand exactly what's in it.

The Backstory

Jean Lugol was a French physician working in Paris when he formulated the solution in 1829 as a way to make iodine stable and easy to dose.

What Changed (and What Didn't)

Iodine on its own barely dissolves in water, which had frustrated every earlier attempt at a reliable liquid preparation. Lugol's contribution was to pair it with potassium iodide, which holds the iodine in solution and keeps it there. Modern versions still rest on that same pairing.

Because the preparation predates modern regulatory frameworks, it's one of the few 19th-century formulations still produced largely unchanged today.

Why This Still Matters Today

That's the kind of detail I want to know before something goes in my pack or my cabinet — not because it changes what I'd do day to day, but because understanding the gear (or the bottle) is half of using it well.

Frequently Asked Questions

Is this historical formula still relevant, or just a marketing story?
It's both. The historical preparation has held up because the underlying chemistry works, not just because it's old — but longevity alone isn't a health claim, and any supplement decision should be made with your own health context in mind.

How do I actually use this 200-year-old formula today?
See our complete guide to Lugol's Solution usage and protocols for dosing, storage, and routine-building basics.

Shop Lugol's Solution — the traditional, trusted way people have supported their iodine intake for over 200 years.

Mark Donovan writes about the practical, self-reliant side of iodine sourcing and storage 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.