Scientists say there is little evidence the pills do any good -and in fact some could be causing serious harm.

科学家表示，没有证据表明这些制剂对健康有益，而且实际上有些制剂还可能损害健康。

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So far, they've been banned by some shopping malls, schools and amusement parks and were considered one of the 10 worst toys for kids last year by the World Against toys Causing Harm W. A. T. c.

迄今为止，它们已经被明令禁止在商业街，学校和娱公园使用，并被去年的世界关注玩具安全组织评选为十大最糟玩具之一。

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Wanderlust has claimed the actions of some entrants harm the environment by leaving litter and causing erosion.

BBC: Three Peaks Challenge on Wanderlust endangered list

But the Asian crisis, like the 1995 Mexican crisis before it, has shown that some types of capital can flow out even more quickly than they flowed in, causing serious economic harm in countries with badly regulated financial systems.

ECONOMIST: Can capital controls stop poor countries crashing?

We must be prepared to accept some false positives (predictions of harms that would not have occurred) in order to prevent some true positives (predictions of harm that would have occurred had we not intervened) from causing irreparable damage.

NPR: Rules Should Govern Torture, Dershowitz Says