Calcium chloride
A mineral salt that keeps processed foods firm and helps set dairy products. Also used in breweries and water treatment.
What is it?
Calcium chloride is an inorganic salt made up of calcium and chlorine. It occurs naturally in small amounts in seawater and some mineral springs, but food-grade material is produced commercially by reaction of limestone with hydrochloric acid or as a by-product of the Solvay process for making soda ash. It is highly soluble in water and releases calcium ions when dissolved.
What does it do?
As a firming agent, calcium ions cross-link pectin in plant cell walls, maintaining texture in canned and processed vegetables. In cheese and tofu production it restores calcium lost during pasteurisation, helping milk proteins coagulate correctly. It also acts as a sequestrant and mineral supplement, and can lower the freezing point of water, which is why it appears in food processing brines.
Where you will see it
Most common in canned tomatoes, canned pulses (such as chickpeas and kidney beans), pickled vegetables, processed cheese, fresh pasta, sports drinks and electrolyte beverages, beer and brewing water, and tofu. In molecular gastronomy it is used to create the calcium bath that sets alginate spheres. On a label it appears as Calcium chloride or E509.
What the science says
Calcium contribution and general nutrition
Calcium chloride delivers bioavailable calcium, the same mineral found in dairy foods and fortified products. At the quantities used in food processing the contribution to daily calcium intake is small but real. There is no credible evidence from human studies that calcium chloride as a food additive causes any adverse effects in the amounts encountered through diet.
EFSA's Panel on Food Additives and Nutrient Sources (ANS) concluded that calcium chloride presents no safety concern at the levels used in food and set no numerical acceptable daily intake, treating the calcium it delivers the same as calcium from any dietary source.
High-dose effects in clinical and animal contexts
At doses many times higher than those encountered in food, intravenous or very high oral calcium can raise blood calcium levels and affect heart rhythm. These effects are relevant to medical settings (calcium chloride is used clinically to treat severe hypocalcaemia) but have no relevance to food exposure, where quantities are a small fraction of a typical daily calcium intake from food.
Hypercalcaemia from dietary calcium chloride is not a recognised risk at food-additive use levels; clinical toxicity requires doses orders of magnitude above what food use delivers.
Where it stands with the regulators
Who should be careful
People on a medically prescribed low-calcium diet should check labels for all calcium-containing ingredients including E509, although food-additive quantities are unlikely to be significant. No other group needs to take specific action. Look for Calcium chloride or E509 on the label.
The honest read
Calcium chloride is among the most ordinary substances used in food production: a mineral salt that does a straightforward structural job. It is chemically identical to the calcium and chloride your body manages daily through diet. The science on it is long-settled, the re-evaluation by European authorities in 2019 found nothing to flag, and there is no active research community raising concerns about it at food-use levels. The only context where calcium chloride causes real harm is intravenous clinical overdose, which has no connection to eating canned tomatoes.
Related additives
Common questions
Is E509 banned in the UK?
No. Calcium chloride (E509) is fully approved in the UK under the retained EU food additives legislation and the UK FSA approved-additives list. It is permitted in a wide range of foods.
Does E509 have any effect on the body?
At food-additive quantities it delivers a small amount of bioavailable calcium, the same mineral found in dairy products and leafy vegetables. There is no evidence of adverse effects at the levels used in food. High intravenous doses of calcium chloride can affect heart rhythm, but this is a clinical medicine context unrelated to eating processed foods.
What foods contain E509?
It is most common in canned vegetables and pulses (such as chickpeas and tomatoes), processed cheese, tofu, fresh pasta, and sports or electrolyte drinks. Craft brewers also use it to adjust water mineral content. Check for Calcium chloride or E509 in the ingredients list.
Is E509 vegan?
Yes. Calcium chloride is a mineral salt with no animal-derived origin. It is suitable for vegans and vegetarians.
Sources
- UK FSA Approved Additives and E Numbers
- EFSA ANS Panel: Re-evaluation of calcium chloride (E 509) as a food additive
- EU Regulation 1333/2008 on food additives (Annex II)
- JECFA evaluation of calcium chloride, FAO/WHO
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