:Well, for edible seaweeds e . g . kelp : " 12 different species of seaweeds were analyzed for iodine content, and found to range from 16 microg / g ( + /-2 ) in nori ( Porphyra tenera ) to over 8165 + /-373 microg / g in one sample of processed kelp granules ( a salt substitute ) made from Laminaria digitata . "; " Edible seaweed contained I levels of between 4300 and 2, 660, 000 micrograms / kg "; So we're looking at roughly 2 mg of iodine per " gram " of kelp ( I assume these are all dry weight ), if you happen to get an average sample, with a just ridiculous amount of variation.
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