[Zicam] is a cold remedy which was sold as a homeopathic medicine, but its makers committed the unforgivable sin of actually having something in its formula besides well-shaken distilled water.
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The moral? If you’re going to sell homeopathic medicine - and boy, is it a lucrative business - make sure that you don’t put anything in there except sterile water. That’ll cut down on your expenses, too, since most ingredients cost more than water, anyway. Stick with that strategy, and you can be absolutely sure that nothing bad will happen to your customers.