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Most problems are self-limiting, Sprinkle says, and many people are susceptible to even the suggestion that an herbal remedy will work. Of the thousands of dietary supplements on the market, very few have been examined through research studies. Dietary supplement manufacturers have little incentive to finance such studies because herbs cannot be patented to recover any of the research costs, Sprinkle says. That is not to say, however, that no herb is effective. If you have questions about the safety or effectiveness of any herbal remedy, it's a wise idea to check with your physician.