This seems basic enough and makes sense to me. I have an almost perfect green thumb but I hated Science in school so someone in that field would be better suited for the job.

Buy two houseplants, exactly the same, from the same store in the same soil, same pot, same set, in the same amount of sunlight required for the specie of plant, etc.
To one add the amount of Miracle-Mineral-Supplement required for the body for detox and the other add the required amount of Iodine for the body. I do not have axcess to Miracle-Mineral-Supplement otherwise I would try this test. This test should be conducted over at least the period required for Miracle-Mineral-Supplement in the body and Iodine should meet that length of time. I would like to see the outcome from such a test on two plants.