take it with a grain of salt

You say "I take it with a grain of salt" when you don't completely believe something. When you take something skeptically, with reservations.

I've read the article, which I take with a grain of salt.

I always take Sandy's stories about illnesses with a grain of salt--she tends to exaggerate.

You have to take everything she says with a grain of salt, she usually exaggerates.

This expression means "to accept something but to not completely believe it". It originates from the idea that adding salt to food helps to swallow it more easily. In the 17th century this concept was applied in a figurative sense, meaning that adding a grain of salt makes it easier to accept what someone says.