I am still searching for the article, but a company was sued from a person getting sick from getting arsenic poisoning from their kelp. The company (it may have been Solaray or Nature's Way) made a statement that this person in question exceeded the recommended dosage. It wasn't by a lot either. I wish I could find that info, sorry. It was with information about Prop, 65 and why it was extended to include kelp. I'll try to find it again later and post it