If you have ever read "ADI not specified" on a gellan gum data sheet and quietly wondered whether that means "no limit", this article is for you. It is the single most misunderstood line in the ingredient's regulatory file.
Who JECFA is and why its opinion travels
The Joint FAO/WHO Expert Committee on Food Additives is the international scientific body that evaluates food additives for the Codex Alimentarius system. Its opinions are not law in any country, but they carry weight because:
- Many national regulators align their specifications with JECFA monographs.
- Codex standards are the reference point in international trade disputes and in WTO discussions.
- Buyers in markets with limited domestic evaluation capacity often rely on JECFA conclusions directly.
For gellan gum, JECFA evaluated the additive in 1991 and allocated an ADI "not specified". The specifications were subsequently revised, with revisions in 2006 and 2014. This is worth remembering: the monograph is a living document, and the version your supplier is releasing against should be stated.
What "ADI not specified" actually means
The acceptable daily intake is the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, normally expressed in milligrams per kilogram of body weight.
"Not specified" is a defined term of art. It does not mean that no limit applies, and it does not mean the substance is unstudied. It means:
The committee found that the available toxicological and exposure data were sufficient, and that the substance is of such low toxicity that a numerical ADI is unnecessary.
In other words, it is the most favourable outcome the committee can give. It is reserved for substances where the data are good and the hazard is low — not for substances where the data are missing.
The caveat that comes with it
JECFA's opinion on gellan gum included an important qualifier: the potential laxative effect at high intakes should be taken into account when the substance is used as a food additive.
This is not a safety concern in the toxicological sense. It is a physiological effect common to many non-digestible polysaccharides, and it appears at intakes far above what occurs in ordinary food. But it is the reason a responsible answer to "is gellan gum safe?" should mention digestion rather than simply asserting "approved everywhere".
What the JECFA specification covers
A JECFA monograph for a hydrocolloid of this type typically defines:
| Parameter | What it controls |
|---|---|
| Identity and description | What the substance is and how it is made |
| Repeating unit and acyl substitution | Distinguishes the material from similar polysaccharides |
| Loss on drying | Moisture and handling |
| Nitrogen content | Residual proteinaceous material |
| Ash | Residual salts |
| Heavy metals, notably lead | Safety |
| Microbiological criteria | Hygiene, absence of pathogens |
| Residual solvents | Where the process uses them |
Buyers sometimes assume that a JECFA-compliant material is automatically acceptable everywhere. It usually is, but the monograph is a specification for identity and purity, not a market authorisation. Authorisation to actually use the additive in a given food category is a separate national matter — in the EU, that is Regulation (EC) No 1333/2008; in the US, 21 CFR 172.665.
Codex and the GSFA
The Codex General Standard for Food Additives lists permitted uses of food additives by food category. Gellan gum appears in a defined set of categories with maximum levels or GMP provisions. For exporters, the GSFA is useful as a first-pass screen: if a category is not listed, the additive is not covered by the international standard for that use, and you will need to check the destination market's national rules.
The practical checklist
When a supplier claims JECFA compliance, ask:
- Which revision of the specification are you releasing against?
- Can you provide the full batch specification, not just the parameters that passed?
- Is heavy metals testing on every batch, and what is the limit of quantification?
- Are microbiological criteria reported per batch?
- Does the COA reference the specification version and date?
A supplier who can answer those five questions is releasing material against a defined standard. One who cannot is releasing material against a habit.
For full specification data and regulatory documentation for gellan gum (E418), contact Cinogel.
Part of the E418.org gellan gum knowledge base. Confirm current specification values against the latest JECFA monograph before relying on them in a technical or regulatory document.