Hijiki does contain non organic arsenic. I eat it in moderate amounts, and not daily, and am not worried. Check out (http://en.wikipedia.org/wiki/Hijiki) the wiki article on Hijiki. It states that eating 4.7g of hijiki per day puts you at risk. The average Japanese is estimated to eat only .9g per day. Hijiki is so versatile and delicious, I really enjoy using it.