E170 / Colours
Calcium carbonate, calcium hydrogen carbonate
Safety in brief
Safe
Recorded EatMatrix rating, not a new clinical review. The amount, your sensitivities and country rules still matter.
- Watch for
- No allergen or sensitivity is recorded for this ingredient here. Check the whole product label; this is not an allergen-free guarantee.
- Our advice
- Read the whole food label and consider how often you eat the product. A name or E number does not tell you the amount, and an ingredient rating cannot assess the entire food.
What it is
Calcium carbonate (CaCO₃) is a naturally occurring mineral, found in limestone, marble, and chalk, used in food as a white colorant, anti-caking agent, and calcium supplement/fortifier. It is also a common active ingredient in antacids, where it neutralizes stomach acid. Calcium hydrogen carbonate (calcium bicarbonate) is the water-soluble form that occurs when calcium carbonate dissolves in water containing carbon dioxide, and it is the main contributor to water hardness and limescale. Both forms are generally recognized as safe (GRAS) for food use by EFSA and FDA.
Also appears on labels as: Calcium carbonate, Calcium hydrogen carbonate, Calcium bicarbonate, Carbonic acid, calcium salt, Carbonic acid, monocalcium salt, CaCO3, Ca(HCO3)2, E170, E 170, E-170, E170(i), E 170(i).
Dietary information
- Vegan
- Yes
- Halal
- Yes
- Gluten-free
- Yes
- Allergens
- None recorded
Recorded ingredient information. Check the product label or certification: sources, other ingredients and cross-contact can vary.
Research & body effects
Health notes from our ingredient record
- Very high intakes (mainly from concentrated supplements, not typical food-additive levels) can contribute to milk-alkali syndrome, causing elevated blood calcium.
- Generally recognized as safe at typical food-use levels.
Other references from our ingredient record
These links come from the original ingredient record. They are separate from the source reviews above and have not all been checked for the exact ingredient, amount consumed or claim. Dates are shown newest first.
- Calcium Carbonate (E170) – Safety Review — EFSA Panel on Food Additives, EFSA Journal (2011). Widely used mineral; ADI not specified; safe; excessive intake linked to kidney stones or hypercalcemia.[safe_in_moderation]
- Scientific Opinion on re‐evaluation of calcium carbonate (E 170) as a food additive — EFSA Panel on Food Additives, EFSA Journal (2011). Official EFSA scientific opinion (bibliographic reference, imported 2026-10-13). It covers the additive as a group assessment and is not an individual human study; read the opinion for its findings.
Country rules
Country checks for E170
Permission depends on the market, type of food, amount and conditions. A scientific opinion or an E-number alone does not establish a legal use. These checks are separate from the stored EatMatrix rating.
Compare all eight markets and their sources
| Market | What is checked |
|---|---|
| European Union | Regulation (EC) 1333/2008, Annex II Part B, version , contains the exact code E170: Calcium carbonate. Listing alone does not allow every food use. Part E food categories, limits, specifications and applicable later acts still need a product-specific check. Source read: . |
| Great Britain | The FSA register record for E170 (Calcium carbonate) lists “Authorised” in England, Scotland and Wales. Register updated: 01 April 2025; record checked: . Food-specific conditions and specifications still need a separate legal check. |
| United States | Selected US conditions for Calcium carbonate subset (named subset) Official federal text current through ; read . Food uses, limits and exceptionsNamed preparation and use conditions The specified calcium carbonate is listed for food use under good manufacturing practice. This provision does not name calcium hydrogen carbonate and is not a substitute for reviewing any separate colour-additive rules. EatMatrix’s reading: a legal use condition answers where and how an ingredient may be used. It is not a test of your product, a personal safe intake or a claim that the ingredient benefits your body. Match the named substance, food and amount. Other federal provisions, food standards, state rules and later changes may also apply; this is a selected source review, not a complete product-compliance decision. |
| Northern Ireland | Review pending. Check the applicable EU rules and territory arrangements; the GB register alone does not establish this status. FSA guidance is a starting source, not a verified permission for this entry. |
| Canada | Named preparation located; broader identity needs matching The located record is calcium carbonate. Calcium hydrogen carbonate is not independently confirmed by these rows. EatMatrix reading: Match the named preparation, specifications, food, purpose and every limit below before using these rows for a product decision. Name and category review: . This describes the legal source check, not a finding that the ingredient is safe, unsafe or untested. Sources and names checkedNames checked: Calcium carbonate, calcium hydrogen carbonate; Calcium Carbonate. All 15 Health Canada permitted-additive lists were checked by exact name, with the reviewed alternatives above. E-numbers alone are not Canadian ingredient names. The Justice Canada consolidation read was current to 21 September 2026. A complete product decision also requires its composition, specifications, intended food and use, quantities, applicable separate provisions and any later changes. Named food-use records located. Health Canada lists the preparations below for specified foods and purposes. This is conditional permission for those uses, not approval of every product or a personal safety verdict. The located record is calcium carbonate. Calcium hydrogen carbonate is not independently confirmed by these rows. Source tables captured . List publication dates are shown separately. Good Manufacturing Practice (GMP) is a condition of use, not an unlimited amount or a recommended intake. Food and Drug Regulations B.16.003 requires the listed source, purpose, amount and other conditions to match. The official consolidation read was current to 21 September 2026; product specifications and applicable later changes still need checking. Read 16 listed food-use conditionsCalcium CarbonateHealth Canada: List of Permitted Food Colours. List published ; item C.1.
Calcium CarbonateHealth Canada: List of Permitted Emulsifying, Gelling, Stabilizing or Thickening Agents. List published ; item C.2.
Calcium CarbonateHealth Canada: List of Permitted Food Additives with Other Purposes of Use. List published ; item C.3.
Calcium CarbonateHealth Canada: List of Permitted Acidity Regulators and Acid-Reacting Materials. List published ; item C.3.
Calcium CarbonateHealth Canada: List of Permitted Yeast Foods. List published ; item C.1.
EatMatrix reading: match the exact preparation and food first. A manufacturing limit is not an acceptable daily intake (ADI). A label without the amount cannot establish exposure, and an unlisted name here does not establish a ban. |
| Australia | Review pending. Food Standards Code permissions and conditions need an additive-specific check. FSANZ food-additive rules is a starting source, not a verified permission for this entry. |
| New Zealand | Review pending. Food Standards Code permissions and conditions need an additive-specific check. FSANZ food-additive rules is a starting source, not a verified permission for this entry. |
| Japan | Review pending. The relevant list, identity and use standards need an additive-specific check. CAA food-additive lists is a starting source, not a verified permission for this entry. |
Sources & review status
Check what each source covers: an authority’s conclusion, a research finding and a country’s legal permission answer different questions.
What this guide covers
- Official assessment sources
- Commission-listed EFSA references for E170. Bibliographic identity checked; latest findings and current use rules need separate review.
- Original ingredient record
- 2 research links; newest recorded date: . Sources added separately to this guide are not included in this count.
This guide brings together our ingredient record and the dated sources shown here. Missing information describes a gap in this guide; it does not mean an ingredient is untested, safe or harmful. This is not a complete review of every study, preparation or current country rule. The amount in a product and how it is used still matter.
How to read the ratings, research and country checksAgency labels recorded by EatMatrix
These are imported database classifications, not verified current statements from each authority. Use the dated official sources below for their actual scope and conclusions.
| Authority | Database label |
|---|---|
| FDA | Safe |
| WHO | Safe |
| EFSA | Safe |
| FSANZ | Safe |
| Japan | Safe |
| UK FSA | Safe |
| Health Canada | Safe |
Official assessment sources for E170
The European Commission’s re-evaluation table lists official EFSA documents for this additive. Their identifiers and subjects were checked against publisher bibliographic records. A missing research link in the EatMatrix database does not mean the additive has never been assessed.
Name in the Commission table: Calcium carbonate; Calcium carbonate (also permitted as colour).
- Scientific Opinion on re‐evaluation of calcium carbonate (E 170) as a food additive
EFSA scientific opinion. Published: .
These are assessment references, including historical or group assessments. They do not establish the latest scientific conclusion, a human health benefit or risk, or current permission to use the additive in a particular food. Later assessments, corrections and food-use conditions need separate review. The recorded EatMatrix rating above is unchanged.
European Commission re-evaluation table, status as of . EatMatrix checked this bibliography on .
Database updated: . What does an E number mean on a food label?
Common questions
Frequently asked questions
What is EatMatrix's recorded rating for E170?
The recorded EatMatrix rating for E170 (Calcium carbonate, calcium hydrogen carbonate) is “Safe”. It is calculated from labels stored in our ingredient database. These labels are not verified current regulator decisions or country permissions. A database update date is not a scientific review date.
Is E170 vegan, halal or gluten-free?
According to our ingredient data for Calcium carbonate, calcium hydrogen carbonate — vegan: yes, vegetarian: yes, halal: yes, kosher: yes, gluten-free: yes, dairy-free: yes. Manufacturing sources can vary between products; check the label if it matters to you.
What is E170 and why is it used?
Calcium carbonate (CaCO₃) is a naturally occurring mineral, found in limestone, marble, and chalk, used in food as a white colorant, anti-caking agent, and calcium supplement/fortifier. It is also a common active ingredient in antacids, where it neutralizes stomach acid. Calcium hydrogen carbonate (calcium bicarbonate) is the water-soluble form that occurs when calcium carbonate dissolves in water containing carbon dioxide, and it is the main contributor to water hardness and limescale. Both forms are generally recognized as safe (GRAS) for food use by EFSA and FDA.
Does E170 contain allergens?
No known allergens are recorded for Calcium carbonate, calcium hydrogen carbonate.
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This page shows information and classifications recorded in our ingredient database. Current scientific and market-specific verification remains pending as described above. It is general information, not medical advice.