Celery salt is a seasoned salt used as a food seasoning, made from ground seeds, which may come from celery or its relative lovage. It may also be produced using dried celery or seed oleoresin.
Some brands of celery salt are very high in the preservative sodium nitrate. When added to foods, sodium nitrate forms small amounts of nitrosamines, a family of possible human carcinogens. As a vegetable, celery seeds have potassium as the dominant ion over sodium (9 fold more). 
Celery salt is an ingredient of the Bloody Mary cocktail and the Caesar cocktail. It is also commonly used to season the Chicago-style hot dog, the New York System wiener, salads, and stews. It can also be used to liven up a coleslaw. It is a primary ingredient in Old Bay brand seasoning.
In New England, especially in Maine, shakers of celery salt frequent institutions that sell hog dogs.
- Celery Salt | Ingredients, Nutritional information & Usage Ideas | Schwartz
- Celery | Bart Ingredients
- Culinary Herbs - Ernest Small. p. 177.
- Coffee and Tea Industries and the Flavor Field . 1914. p. 270.
- Nitrosamines and Cancer
- Herbs and Spices, Buy Herbs, Spices & Seasoning - Seasoned Pioneers
- List of ingredients provided at: http://www.oldbay.com/Products/Old-Bay-Seasoning.aspx
- Nitrates: Facts About Sodium Nitrate
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