If you’re familiar at all with how to cap it in capsules or create a liquid, this is more cost effective than a lot of the other solutions out there:
https://www.amazon.com/Potassium-Iodide-Purity-Crystals-grams/dp/B01JKJWXBK/
"Anyone over 18 years old and up to 40 years old should be treated at a slightly higher threshold. Finally, anyone over 40 years old should be treated with KI only if the predicted exposure is high enough to destroy the thyroid and induce lifelong hypothyroidism (thyroid deficiency)."