“This is dangerous as it could damage the thyroid gland”
Not likely. Iodine is a necessary nutrient. A large share of the population are deficient in it.
But people who have Hyperthyroidism could be negatively affected by it.
Kelp works too, filled with natural iodine. FWIW.
We were “Downwinders” in elementary school, and were given iodine tablets once a week. I don’t know that it did any damage. Unless you count my warped sense of humor.