To take something with a "grain of salt" or "pinch of salt" is an English idiom that suggests to view something, specifically claims that may be misleading or unverified, with skepticism or not to interpret something literally.^[1]

In the old-fashioned English units of weight, a grain weighs approximately 65 mg, which is about how much table salt a person might pick up between the fingers as a pinch.

The phrase is thought to come from Pliny the Elder's Naturalis Historia, regarding the discovery of a recipe written by the Pontic king Mithridates to make someone immune to poison.^[2] One of the ingredients in the recipe was a grain of salt. Threats involving poison were thus to be taken "with a grain of salt", and therefore less seriously.

The phrase cum grano salis ("with a grain of salt") is not what Pliny wrote. It is constructed according to the grammar of modern European languages rather than Classical Latin. Pliny's actual words were addito salis grano ("after having added a grain of salt").

The Latin word sal (salis is the genitive) means both "salt" and "wit", thus the Latin phrase cum grano salis could be translated to either "with a grain of salt" or "with a grain of wit", actually to "with caution"/cautiously.^[3]

The phrase is typically said "with a pinch of salt" in British English and said "with a grain of salt" in American English.^[4]

• The dictionary definition of with a grain of salt at Wiktionary

v t e Salt
History	History In the American Civil War International Salt Co. v. United States In Middlewich Old Salt Route In Chinese history Salt March Salt road
Types	Abraum Alaea Alberger Asín tibuok Bittern Black lava Butter Calcium chloride Celery Curing Cyclic Dairy Flake Fleur de sel Garlic Himalayan Iodised Jugyeom Kala namak Korean brining Kosher Monosodium glutamate Moshio salt Pickling Potassium chloride Potassium nitrate River reed salt Sodium nitrate Onion Rock Salammoniac Salt substitute Sea salt Seasoned Sel gris Smoked Sodium chloride Truffle Túltul
Food usage	Brining Salting Brined cheese Salt-cured meat Salted fish Health effects Salt and cardiovascular disease
Commerce and industry	Salt Industry Commission Evaporation pond Salt mining Salt well Sink works Open-pan salt making List of countries by salt production Salt tectonics
By region	In Cheshire In Ghana San Francisco Bay In Pakistan
Culture	Grain of salt Salt in the Bible Salting the earth
Miscellaneous	Mineral lick Road salt Smelling salts Water softening Ximenes Redoubt Tax
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