But these treatments don't work for everyone and often cause side effects.
但是，这些疗法并不能对所有人起作用，而且往往会产生副作用。
But researchers have found that in many cases they can cause unexpected side effects.
但研究人员发现，在许多情况下，这些产品也可能会导致意想不到的副作用。
They'd been the cause not only of serious side effects but also several deaths.
它们不仅有严重的副作用，甚至造成数人死亡。
They'd been the cause not only of serious side effects but also several deaths.
它们不仅有严重的副作用，甚至造成数人死亡。
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