I have read countless times how good Kelp is and to get a testted or clean supplement free of metals etc., but ont he phone yesterday I talk to a guy who sells Thorvin Kelp which is from Iceland and needless to say he says all of the Kelps and things like that from the sea will have metals in it and thats just a given! He says most will avoid the question nor test their products or post things about it as far as metals go! Thorvin he said is the cleanest and check out the Aluminum content on the link below. I called him to ask him about that and he did not dodge it and answered me right away, he called me several times back to answer me too so he is very thorough. It seems you can't avoid the metals in these things, yikes!!!!http://www.thorvin.com/kelp_for_plant_analysis.htm