Is squid high in histamine?
Fresh or frozen squid is low in histamine on the evidence we have: seafood had none in lab tests. But only 7 samples were measured, and the study does not say whether squid was one of them.
- Histamine
- Not detected
- Other amines
- Low
- Liberator
- Claimed, unproven
- DAO blocker
- No evidence
Why sources disagree. Seafood had no detectable histamine in lab tests, but only seven samples were measured, the paper does not say whether squid was among them, and some published diets and a 2024 clinical review exclude seafood.
What each source says
| Source | Verdict | What it says, in our words |
|---|---|---|
| Lab measurements, Spain 1 | Measured | No detectable histamine in 7 seafood samples; the species, and whether squid was included, are not given. |
| 10 published low-histamine diets 1 | 3 of 10 exclude seafood. | |
| Clinical review, 2024 2 | Lists seafood among foods a low-histamine diet avoids. | |
| Histamine-liberator claim 1 | Seafood is listed among suggested histamine-releasing foods; no human study supports the claim. | |
| SIGHI food list 3 | See source | See SIGHI's own list for its rating. |
Measured histamine
| Food tested | Samples | Histamine | Other amines |
|---|---|---|---|
| Seafood sold in Spain (group; species not given) 1 (Table 1) | 7 | not detected | putrescine mean 3.02 mg/kg (1.44–9.79); tyramine mean 0.15 mg/kg; cadaverine not detected |
mg/kg = milligrams of histamine per kilogram of food. "Not detected" means below the laboratory's detection limit.
How freshness and processing change it
Squid is often sold frozen, which suits a low-histamine diet: cook it from frozen or soon after thawing in the fridge, and eat it the same day. Frying does not remove histamine. Dried and canned squid and leftovers have had more time for amines to form.
Seafood (group) had no detectable histamine in 7 samples; squid was not named. (measured)
Not measured; dried and stored for a long time. (estimate)
Not measured; histamine that formed before canning survives the canning heat. (estimate)
Not measured. Storage time adds histamine, and reheating does not remove it. (estimate)
Why we rate squid 0
Squid sits at the edge of the evidence. The University of Barcelona team's survey of foods sold in Spain reports seven samples of seafood with no detectable histamine, low putrescine (3.02 mg/kg on average), very little tyramine (0.15 mg/kg) and no cadaverine. The paper does not name the species, and squid, a cephalopod, is not always counted as shellfish, so we cannot be sure it was among the seven. We use the seafood figure because it is the closest measurement there is, and we say so here.
What the biology and the law add is limited. Histamine in seafood is made by bacteria from histidine during storage. EU food law sets histamine limits only for fish species associated with a high amount of histidine; squid is not a fish, so it is not covered. That tells us squid is not on the regulator's list of high-histidine species, not that it has been shown to be low.
Squid is often sold frozen, cleaned and cut into rings or tubes. Freezing soon after catch limits the time in which bacteria can act, so frozen squid cooked from frozen or soon after thawing is the closest match to the fresh samples that were measured. Fried calamari is often made from such rings. A 2018 review explains that amines are heat-stable and that cooking changes their level only by moving them into cooking water or by concentrating or diluting the food, so frying does not remove histamine, and it does not create any. Dried squid, sold as a snack, and canned squid were not measured; both are processed and stored for longer, and we rate them 2, "moderate", as estimates.
The published diets are split. Three of the ten low-histamine diets in a 2021 review exclude seafood, and a 2024 clinical review lists seafood among the foods to avoid. Seafood also appears on lists of supposed histamine liberators, a claim the 2021 review says no human study supports. We mark squid disputed.
We rate fresh or frozen squid 0, "low", on the seafood measurement, with two caveats: the sample was small, and squid may not have been in it. If you are reintroducing squid after an elimination phase, treat it like other seafood: fresh or frozen, cooked the same day, and not kept as leftovers. Allergy to squid and other molluscs is a separate condition from histamine intolerance.
Questions about squid and histamine
Is calamari low histamine?
Fried calamari made from fresh or frozen squid and eaten straight away matches the seafood samples that had no detectable histamine, so we rate it 0. Frying does not remove histamine, and it does not create any. Squid was not measured on its own.
Is dried squid high in histamine?
It was not measured. Dried squid is processed and stored for a long time, which gives amines time to form, so we rate it 2 as an estimate.
Evidence behind this page
- Seven seafood samples sold in Spain had no detectable histamine; putrescine averaged 3.02 mg/kg, tyramine 0.15 mg/kg, and cadaverine was not detected. The species are not given. 1
- EU histamine limits apply to fishery products from fish species associated with a high amount of histidine; squid is not a fish and is not listed. 4
- Three of ten published low-histamine diets exclude seafood, and a 2024 clinical review lists seafood among foods to avoid. 12
- Seafood is listed among foods said to release the body's own histamine, but no human study supports the claim. 1
- Amines are heat-stable, so cooking changes their level only by moving them into cooking water or by concentrating or diluting the food. 5
Sources
- Sánchez-Pérez S, Comas-Basté O, Veciana-Nogués MT, Latorre-Moratalla ML, Vidal-Carou MC. Low-Histamine Diets: Is the Exclusion of Foods Justified by Their Histamine Content? Nutrients 13(5):1395, 2021. doi:10.3390/nu13051395 (Sánchez-Pérez S et al. 2021)
- Jochum C. Histamine Intolerance: Symptoms, Diagnosis, and Beyond. Nutrients 16(8):1219, 2024. doi:10.3390/nu16081219 (Jochum C 2024)
- Swiss Interest Group Histamine Intolerance (SIGHI). Food compatibility list for histamine intolerance. histaminintoleranz.ch (accessed November 2026), 2026. Link (Swiss Interest Group Histamine Intolerance (SIGHI) 2026)
- European Commission. Commission Regulation (EC) No 2073/2005 on microbiological criteria for foodstuffs. Official Journal of the European Union L 338, 2005. Link (European Commission 2005)
- Sánchez-Pérez S, Comas-Basté O, Rabell-González J, Veciana-Nogués MT, Latorre-Moratalla ML, Vidal-Carou MC. Biogenic Amines in Plant-Origin Foods: Are They Frequently Underestimated in Low-Histamine Diets? Foods 7(12):205, 2018. doi:10.3390/foods7120205 (Sánchez-Pérez S et al. 2018)