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I think the reason they use placebos that produce similar side effects is so the doctors examining the patients do not immediately know which ones are on placebo. Also, I would not have expected placebo ingredients to be published in the journal article. Those articles are meant to be concise and to the point, and not include such extraneous data. I would be very surprised to learn that the ingredients did not even need to be disclosed upon submission for approval by the FDA, however.