Iodine is essential for healthy functioning of the thyroid gland which, among other things, controls the body’s metabolism. During pregnancy and infancy, it also influences bone and brain development. Adults generally need 150 mcg of iodine per day. Pregnant and nursing women need more.
In the U.S., where iodized salt is commonly used in shakers and processed foods and iodine is used in commercial dairy production, most people get enough. I use sea salt and eat very little of the foods that are either naturally high in or supplemented commercially with iodine. Plus, I am hypothyroid.
So yesterday, I researched 2017 kelp reviews at:
- OnLine Strength (http://onlinestrength.com/kelp-supplements/) and
- Consumer Lab (www.consumerlab.com).
- Consumer Lab found three of the kelp supplements they tested contained more iodine than the FDA considers safe. Even worse, one contained arsenic.
- Both sites approved Nature’s Life Icelandic Kelp, but the label itself says, “This product contains a chemical known to the State of California to cause cancer, birth defects or other reproductive harm.” I don’t know what’s going on with that.
- My own price check at Amazon sometimes did and sometimes did not match what the reviews listed.
In the past, I have tested positive for thyroid antibodies (Hashimoto’s Thyroiditis). At the moment, my thyroid antibody level is normal, but I am cautious about iodine, because too much could trigger a recurrence.
Since the one tablet per day dose of iodine for some recommended brands was considerably higher than I want to take, I chose Country Life Arctic Kelp from Amazon for $8.50. It contains 300 tablets (3 cents each) of 225 mcg of iodine and is eligible for Amazon’s FREE Shipping offer.
For information on the dangers of taking too much iodine, see http://lpi.oregonstate.edu/mic/minerals/iodine#excess.