Shellfish-Free Ingredients — E-Numbers and Crustacean Allergy
No E-number is routinely made from crustaceans or molluscs — shellfish allergy risks in processed food come from actual shellfish ingredients, which must be declared. Two edge cases are worth knowing.
Canthaxanthin (E161g) occurs naturally in crustacean shells, but the food-additive version is made synthetically. 4-hexylresorcinol (E586) isn't shellfish-derived but is used on shellfish — it's applied to prawns to stop black spots, so its presence on a label is actually a hint that crustacean processing is involved. Chitosan, derived from shellfish shells, is used as a fining agent in some wines rather than as a labelled additive.
Crustaceans and molluscs are both declared allergens, so any deliberate shellfish ingredient must appear on the label in bold.
Shellfish-adjacent additives
| E-Number | Name | Safety | Details |
|---|---|---|---|
| E161g | Canthaxanthin | Some Concerns | Full details |
| E586 | 4-Hexylresorcinol | Safe | Full details |
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Additive data sourced from Open Food Facts (ODbL licence) and the European Food Safety Authority (EFSA). This page is for general information and does not provide medical or dietary advice.