E633 / Flavour enhancers
Calcium inosinate
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 inosinate is the calcium salt of inosinic acid, used as a flavor enhancer to boost umami taste in seasonings, sauces, and processed foods. It is typically used together with other flavor enhancers such as MSG or guanylates rather than alone. It is considered safe by EFSA and the FDA within regulated use levels, though it is one of the less commonly used inosinate salts commercially.
Also appears on labels as: Calcium inosinate, Inosine-5'-monophosphate calcium salt, IMP calcium salt, E633, E 633, E-633, INS 633, Food grade calcium inosinate, Calcium inosinate powder, Calcium inosinate solution, Additivo alimentare E633, Additif alimentaire E633.
Dietary information
- Vegan
- No
- Halal
- No
- 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
- May be derived from meat, fish, or microbial/yeast fermentation depending on the manufacturer, so vegetarian/vegan status is not guaranteed.
- Contributes to dietary purine intake, relevant for people managing gout or hyperuricemia.
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.
- Safety assessment of nucleotide flavor enhancers: comprehensive review — International Food Additives Council, Food and Chemical Toxicology (2019). A comprehensive safety assessment of nucleotide flavor enhancers including inosinic acid derivatives (E 629-E 633). The review examined extensive toxicological data, metabolic studies, and exposure assessments. The study concluded that these inosinate compounds are rapidly metabolized to normal dietary constituents and pose no safety concerns when used according to good manufacturing practices.[safe]
- Scientific Opinion on the re‐evaluation of inosinic acid–5′‐inosine monophosphate (E 630), disodium 5′‐inosinate (E 631), dipotassium 5′‐inosinate (E 632) and calcium 5′‐inosinate (E 629, E 633) as food additives — EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), EFSA Journal (2018). The Panel on Food Additives and Nutrient Sources added to Food (ANS) provided a scientific opinion re‐evaluating the safety of inosinic acid (E 630), disodium inosinate (E 631), dipotassium inosinate (E 632), and calcium inosinate (E 629, E 633) when used as food additives. The Panel concluded that there is no safety concern for the general population when these substances are used as food additives at the reported use levels.[safe]
- Metabolic fate of inosine 5′-monophosphate and related compounds in humans — Yamamoto S, Wakabayashi K, Takahashi M, Journal of Nutritional Biochemistry (2017). Research on the metabolic fate of inosine 5′-monophosphate (IMP) and related inosinate compounds (E 629-E 633) in human subjects. The study showed these compounds are rapidly hydrolyzed to inosine and then to hypoxanthine, which are normal constituents of cellular metabolism. No accumulation or adverse metabolic effects were observed.[safe]
Country rules
Country checks for E633
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 E633: Calcium inosinate. 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 E633 (Calcium inosinate) 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 | Complete current-use review pending. Any scoped provision in the label guide above applies only to the stated use. FDA explains the applicable food-additive and GRAS framework. |
| 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 | Exact use and legal category need confirmation No exact named additive row was found for this flavour-related ingredient. CFIA distinguishes flavouring preparations from food additives; a flavour-related E-number alone does not establish that the actual preparation qualifies for that exclusion. EatMatrix reading: Confirm the chemical identity, formulation and intended flavouring role under the relevant Canadian rules. Neither an MSG statement nor an NHP ingredient entry establishes food permission for this preparation. 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 inosinate. 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. |
| 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
- Original ingredient record
- 3 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 |
|---|---|
| WHO | Safe |
Database updated: . What does an E number mean on a food label?
Common questions
Frequently asked questions
What is EatMatrix's recorded rating for E633?
The recorded EatMatrix rating for E633 (Calcium inosinate) 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 E633 vegan, halal or gluten-free?
According to our ingredient data for Calcium inosinate — vegan: no, vegetarian: no, halal: no, kosher: no, gluten-free: yes, dairy-free: yes. Manufacturing sources can vary between products; check the label if it matters to you.
What is E633 and why is it used?
Calcium inosinate is the calcium salt of inosinic acid, used as a flavor enhancer to boost umami taste in seasonings, sauces, and processed foods. It is typically used together with other flavor enhancers such as MSG or guanylates rather than alone. It is considered safe by EFSA and the FDA within regulated use levels, though it is one of the less commonly used inosinate salts commercially.
Does E633 contain allergens?
No known allergens are recorded for Calcium inosinate.
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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.