Ingredient · E509

Rennet Salt

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Source
Not animal-derived
Allergen
No
Role in food
Manufacturers add calcium chloride to foods to firm up fruits and vegetables, such as …

What it is

Rennet salt, also known as calcium chloride, is a salt that occurs naturally in seawater and some minerals. It is produced industrially through chemical processes, often involving the reaction of limestone with hydrochloric acid. It is a white crystalline solid that is highly soluble in water.

Why it's used

Manufacturers add calcium chloride to foods to firm up fruits and vegetables, such as in canned tomatoes or pickles. It is also used as an electrolyte in sports drinks and as a firming agent in cheese making. It can be found in a variety of processed foods, including baked goods and dairy products.

Health notes

Calcium chloride is generally recognized as safe (GRAS) by the FDA for use in food. It is an essential mineral for human health, playing a role in nerve and muscle function. JECFA and EFSA have evaluated calcium chloride and found it to be safe for consumption. At typical dietary levels, it is not associated with adverse health effects.

Allergen info

Calcium chloride is not derived from any of the nine FDA major allergens. It does not contain gluten.

Products containing Rennet Salt

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Last updated: September 28, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.