Rich had mentioned to make sure you are getting a good source for seaweed. As far as sources that may be unsafe - is it appropriate to ask my favorite sushi shop where they are sourcing it or is it not as significant in that amount? Also, if is there a good source that can be recommended? Or advice on how to navigate this? I saw on Mountain Rose Herbs they have flakes and powders but I am interested in sheets - large or snack sized. Thank you!

Rich said: Really what you need to look for is certified organic and thorough testing for heavy metals, radiation, and other contaminants. Maine Coast Sea Vegetables is good but there are others - as long as they do all that. Mtn Rose may do all this but I am not sure and haven't looked. Regarding your sushi shop - sure you can ask. It helps build awareness. In Japan this is a huge contentious issue with the Fukushima contamination continuing to threaten the seafood industry and fishermen's livelihoods. For example you can read this article from this past week: https://www.theguardian.com/world/2020/oct/23/fukushima-reactor-water-could-damage-human-dna-if-released-says-greenpeace My guess is that your sushi shop will assure you that it is all clean and there is nothing to worry about. If they don't give you the actual source that is not anything you can trust. If you're eating that on occasion and are otherwise healthy, it is no big deal (I think we can worry about everything and shut down!). But if you're eating that sushi every day or even a few times a week, it begins to matter...