"We have a whole lot of power over what lives or dies on this planet and we have to think very carefully about what that means and how we're using it." -Juan Enriqez James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

The problem isn't just that fake cures are worthless, doctors say. Fraudulent claims also give some people the false sense that the product can protect them from getting sick. iStockphoto hide caption

itoggle caption iStockphoto