I read an article about kelp extract and it claimed that all of the kelp extract that's on the market are contaminated.
The article also mentioned its benefits and I also agree that it sounds like a great supplement, especially for anyone who has an iodine deficiency. But the author also said that the oceans are not as pure as they use to be several decades ago. Several studies have found high arsenic levels in kelp extract.
How can we know if the kelp extract sold at pharmacies and other stores are safe? Would organic or natural ones be safer?