Japanese idiom equivalent to “take with a grain of salt”

Question

Is there a Japanese idiom equivalent to "take with a grain of salt"?

In other words, an idiom which means "don't accept this information as completely true or the complete truth".

Answer 1

This may be close to that phrase:

話{はなし}半{はん}分{ぶん}に聞く

話半分 denotes where roughly half of what is said is a truth, and half is a falsehood or exaggeration according to Daijirin.

Another similar phrase may be 割り引いて聞く, which means something similar to "discount some of what somebody says".

See also Space ALC for more expressions.

Answer 2

For expressing such stories, the phrase 眉唾もの is close. Or, in the form of a predicate, you can say 眉に唾をつけて聞く.