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On the other hand, the American Cancer Society mentions on its website that caution should be taken with products sold as supplements since, unlike companies that manufacture medications, those that produce supplements do not have to prove that they are safe and/or effective, nor that they prevent, treat, or cure any disease. It also states that many products do not contain the amount of the herb or substance or ingredients mentioned on the label (which can vary from batch to batch) and may contain contaminants, despite the FDA's attempts to change regulations in 2007. They can interact not only with other medications and herbs but also with foods. For these reasons, the information we have is incomplete.