What is E263?
Calcium acetate — a simple calcium salt of acetic acid, used as an acidity regulator and preservative, and also a well-established medical treatment.
E263 (calcium acetate) is made by combining calcium with acetic acid, the acid found in vinegar. Unlike ammonium acetate, it belongs to a well-reviewed part of the acetate family alongside sodium acetate, and is also a long-established medical treatment for high phosphate levels in people with kidney disease. Goodnessly rates it Safe.
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Read the FAQ →
What is calcium acetate?
Calcium acetate is made by combining calcium with acetic acid, the same acid that gives vinegar its sharpness. Beyond its food-additive role, it's also a well-established prescription medicine, used to control high blood phosphate levels in people with kidney disease by binding to phosphate in the digestive tract so it's excreted rather than absorbed. This dual role in both food and medicine reflects decades of accumulated safety data.
What's it used for?
- Acidity regulator in a range of processed foods
- Preservative, inhibiting mould growth
- Sequestrant to bind trace metals
Where you'll find 263 on the shelf
A minor, functional ingredient in a small range of processed foods.
Is calcium acetate safe? What the research says
Calcium acetate has an unusually well-documented safety record for a food additive, given its parallel use as a prescription medicine.
| Region | Status | What this means |
|---|---|---|
| AU/NZ Australia & New Zealand (FSANZ) | Permitted | Permitted as an acidity regulator and preservative with no specific quantity restriction in most categories. |
| EU European Union (EFSA) | Permitted | Listed as E263, approved for general food use. |
| US United States (FDA) | GRAS | Holds Generally Recognized As Safe status for use as a food additive. |
Calcium acetate is also an approved prescription medicine for controlling blood phosphate levels in people with kidney disease, giving it a clinical safety record well beyond what's typical for a food additive.
- No significant regulatory changes: calcium acetate's approval status has remained stable, reflecting its long, low-controversy safety record.
This section is checked periodically rather than continuously — if you're reading this well after the date above, it's worth confirming nothing has changed before citing it.
Who this matters to
- No population group has a specific safety-based reason to limit E263 at typical food-additive levels
Goodnessly rates E263 Safe. It has an unusually well-documented safety record, given decades of established clinical use as a prescription medicine alongside its food-additive approval.
How to spot it on a label
E263 is usually declared clearly. Look out for:
- Calcium acetate
- 263 or E263
- "Preservative (263)" in the ingredients list
Related additives
Frequently asked questions
Is calcium acetate used in medicine?
Yes — separate from its food-additive role, calcium acetate is an approved prescription medicine used to control high blood phosphate levels in people with kidney disease, by binding to phosphate in the digestive tract so it's excreted rather than absorbed.
Why is calcium acetate rated differently from ammonium acetate?
Both are acetate salts, but calcium is an essential nutrient the body regulates as a matter of course, while the ammonium ion is processed differently, via the liver, as part of nitrogen metabolism. Calcium acetate has also been the subject of extensive clinical research given its medical use.
Does Goodnessly rate E263 as safe, caution, or avoid?
Goodnessly rates E263 (Calcium Acetate) as Safe. It has an unusually well-documented safety record, given decades of established clinical use as a prescription medicine alongside its food-additive approval.
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