Cross-linked sodium carboxymethyl cellulose
A chemically modified plant fibre used in food supplement tablets to help them break apart quickly after swallowing.
What is it?
Cross-linked sodium carboxymethyl cellulose (also called cross-linked cellulose gum or croscarmellose sodium) is a modified form of cellulose, the structural fibre found in plant cell walls. It is made by treating sodium carboxymethyl cellulose (E466) with a cross-linking agent, creating a three-dimensional network of cellulose chains. The result is a powder that swells rapidly on contact with water but does not dissolve.
What does it do?
In tablet and capsule form, E468 acts as a disintegrant. When a tablet is swallowed and reaches the stomach, the cross-linked cellulose swells as it absorbs water, forcing the tablet apart and releasing the active ingredients. Because the cellulose chains are cross-linked rather than free, the material holds its structure in dry conditions but expands dramatically when wet, making it highly effective at breaking down compressed tablets quickly.
Where you will see it
Used almost exclusively in food supplement tablets and capsules, where it helps vitamin, mineral, and herbal tablets disintegrate after swallowing. It is rarely found in mainstream food products. On a label it may appear as 'cross-linked sodium carboxymethyl cellulose', 'cross-linked cellulose gum', or 'E468'.
What the science says
Absorption and gut passage
Cross-linked cellulose is not broken down by digestive enzymes and is not absorbed through the gut wall. It passes through the gastrointestinal tract intact, behaving broadly like insoluble dietary fibre. No systemic exposure occurs at the levels used in food supplements.
Cellulose and its derivatives, including cross-linked forms, are not digested or absorbed in the human small intestine and pass into the colon unchanged.
Regulatory safety evaluation
The Joint FAO/WHO Expert Committee on Food Additives (JECFA) and EFSA have both reviewed the cellulose family. No numerical acceptable daily intake has been set for E468 because the available evidence does not indicate a toxicological risk at the levels used in food. The permitted uses are narrow, confined mainly to food supplements, so real-world intake from food is very low.
No numerical ADI was established for cross-linked sodium carboxymethyl cellulose; it is permitted on a quantum satis basis within its approved food categories.
Commission Regulation (EU) 2025/666 updated specifications for cellulose food additives including E468, clarifying purity and identity criteria.
Where it stands with the regulators
Who should be careful
No group is advised to avoid E468 on safety grounds. People with rare hypersensitivity to cellulose derivatives should check supplement ingredient lists for 'E468', 'cross-linked cellulose gum', or 'croscarmellose sodium', though such reactions are extremely uncommon.
The honest read
E468 sits in a corner of the additive list that attracts little controversy. Its use is confined to supplement tablets, it is not absorbed by the body, and neither EFSA nor JECFA has identified a toxicological threshold requiring a numerical limit. The science on the cellulose family is longstanding and the gaps are narrow: most open questions concern batch-to-batch purity specifications rather than physiological effects. For someone who takes vitamin or mineral supplements, it is one of the most structurally unremarkable tablet ingredients on the label.
Related additives
Common questions
Is E468 banned in the UK?
No. E468 is approved for use in the UK under the assimilated EU Regulation (EC) No 1333/2008, permitted in food supplement tablets.
What is E468 actually doing in my supplement tablet?
It acts as a disintegrant: when the tablet reaches your stomach and comes into contact with water, E468 swells rapidly and pushes the tablet apart, releasing the active ingredients so they can be absorbed.
What foods contain E468?
Almost exclusively food supplement tablets and capsules, such as vitamin, mineral, and herbal supplements. It is not used in everyday food products like bread, drinks, or ready meals.
Is E468 vegan?
Yes. It is derived from plant cellulose and contains no animal-derived ingredients.
Sources
- European Commission: Regulation (EC) No 1333/2008 on food additives, Annex II
- Commission Regulation (EU) 2025/666 amending specifications for cellulose food additives including E468
- UK FSA: Approved additives and E numbers
- Open Food Facts: E468 cross-linked sodium carboxymethylcellulose
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