Calcium bisulphite
Safe for most, but individuals sensitive to sulfites must strictly avoid.
- Category
- Preservatives
- Vegan
- Yes
- Vegetarian
- Yes
What it is
A chemical preservative and antioxidant used to prevent browning and bacterial growth.
How it is used in food
Calcium bisulphite prevents enzymatic and non-enzymatic browning, inhibits wild yeasts and bacteria, and preserves colour and flavour in wine, beer, fruit juices, dried fruit and processed potato products. It is also used in brewing to sanitise and to condition water, and the calcium ion can help firm plant tissue.
Commonly found in- Wine
- Dried fruit
- Beer
Health and safety
Like other sulfites, it can trigger severe asthma attacks or allergic reactions in sensitive individuals.
Roughly 3 to 10 percent of people with asthma are sulphite-sensitive, and reactions can include bronchospasm severe enough to be life-threatening; sensitivity is far rarer in people without asthma. EFSA's 2016 re-evaluation of sulphites lowered confidence in the old ADI of 0.7 mg SO₂ per kg body weight per day, noting data gaps and that high consumers may exceed it. Sulphites also destroy thiamine (vitamin B1), which is why they are not permitted in foods that are meaningful sources of it, such as meat.
Regulatory status
| Region | Status | Notes |
|---|---|---|
| Australia & New Zealand FSANZ |
Permitted | Permitted under the FSANZ Food Standards Code. |
| European Union EFSA / European Commission |
Permitted | Authorised for food use under EU regulations (Annex II). |
| United States FDA (Food and Drug Administration) |
Permitted | Authorised for food use by the FDA (often GRAS for standard additives). |
Identification on labels
- E-number
- E227
Also printed asCalcium bisulfite
Worth knowing
Sulphites are the reason dried apricots come in two colours: bright orange ones are sulphited, dark brown ones are not. Because reactions can be severe, EU and US rules require sulphites to be declared whenever total SO₂ exceeds 10 mg/kg or 10 mg/l, regardless of which sulphite salt was used.
Conclusion
Safe for most, but individuals sensitive to sulfites must strictly avoid.
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Open the appEntry last reviewed 2026-07-28.
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