Four of the six collagen jelly sticks we track — BB LAB, FOODOLOGY, Cloo9, and HAMCHOROK — use fish collagen. Fish is one of the UK’s 14 legally mandated food allergens, meaning it has to be named and visually emphasised on the label wherever it’s an ingredient. Checking all four listings directly, only one of them does that clearly. That’s the real, checkable finding behind this piece — not a scare story, just what’s actually on each label.
Which products actually contain fish collagen
| Product | Collagen source | Fish flagged as an allergen on the listing? |
|---|---|---|
| BB LAB Pomegranate Collagen S | Marine (fish) | Listed as an ingredient (“Fish Collagen”), not visually flagged — the listing does bold “Contains Milk” for its milk protein ingredient, but fish isn’t given the same treatment |
| FOODOLOGY Collagen Centella Jelly | Marine (fish) — two fish-derived ingredients: “Small Molecular Fish Collagen” and salmon milt extract | Same pattern: “Contains Milk” is flagged, fish isn’t |
| Cloo9 Collagen Jelly | Marine (fish) | Yes — the ingredients list states “Hydrolysed Marine Collagen Peptides 25% (FISH),” clearly bolded |
| HAMCHOROK Rg+ Pomegranate Collagen Jelly | Marine (fish) | Listed as an ingredient (“Fish Collagen”), not visually flagged in the online listing |
| NOW Foods Collagen Jelly Beauty Complex | Bovine (VERISOL) | No fish collagen at all |
| YIXO Vegan Collagen Jelly | Plant-based, marketed as vegan | No ingredients list for this product published anywhere on YIXO’s own site that we could find — see caveat below |
A genuine correction to our own ingredients comparison piece: we’d previously only confirmed marine collagen in three of these products. Checking FOODOLOGY’s listing directly for this piece turned up “Small Molecular Fish Collagen” and a salmon milt extract in its ingredients too — a fourth fish-derived product, not three.
On YIXO specifically: the brand markets this product as vegan, and there’s no reason to doubt that in principle — but YIXO’s own “Ingredients” page only documents an entirely separate range (alcoholic jelly shots), and the collagen jelly’s product page doesn’t list ingredients either. We can’t independently verify what’s actually in it beyond the marketing copy (Vitamin C, hyaluronic acid, and an unnamed “plant-based collagen-support” blend). If avoiding fish is a hard requirement, check with YIXO directly before ordering rather than taking “vegan” on trust from a page with no ingredient list.
Is fish legally required to be flagged as an allergen?
Yes. Fish is one of the 14 allergens UK food businesses must declare under retained EU food information law, enforced via the Food Standards Agency — when it’s present as an ingredient, it has to be named and emphasised (bold, capitals, or underlined), not just listed alongside everything else. A narrow exemption exists for fish gelatine used purely as a carrier for vitamin preparations or as a fining agent in beer and wine — that doesn’t apply here, since fish collagen is a substantial, named ingredient in these products, not a processing aid.
What we found checking the four fish-collagen listings directly: three of them list “Fish Collagen” in the ingredients but don’t give it the same bolded treatment as milk, which is flagged on the same listings. We’re reporting what’s visible on the online listing as it’s displayed to a UK shopper — we haven’t inspected the physical pack of any of these products, and formatting doesn’t always survive the trip from pack to website, so this isn’t a claim that the physical labelling itself is non-compliant. It’s a reason to read the actual ingredients list yourself rather than relying on a listing’s allergen callouts, since they’re clearly inconsistent across these products.
What the allergy research actually says
The evidence here is genuinely mixed, not one-sided. Fish collagen is a documented allergen: studies have found IgE sensitisation to fish collagen in a meaningful minority of fish-allergic patients — one study put it at around 21% — and pooled serum from collagen-sensitised patients showed reactivity across multiple fish species, suggesting real cross-reactivity rather than a reaction limited to one type of fish. The allergen is also heat-stable, meaning cooking or processing doesn’t reliably remove the risk the way it can with some other food allergens.
Against that, two separate European studies using actual food challenges — the gold-standard way of confirming a real allergic reaction, rather than just a positive blood or skin test — found collagen to be less clinically significant than parvalbumin, the muscle protein that’s the main driver of most fish allergies. In other words: some people with a diagnosed fish allergy tolerate fish collagen fine, and a positive lab test for collagen sensitisation doesn’t necessarily mean a real-world reaction. There’s no reliable way to predict which applies to you without being tested specifically, which is exactly why this is a question for an allergist rather than something to guess at from a label.
What a reaction actually looks like
Standard fish-allergy symptoms apply here too: hives, an itchy throat or mouth, swelling of the face or lips, or stomach symptoms like nausea and vomiting, usually within minutes of eating. Severe reactions are less common but can include difficulty breathing, throat swelling, or fainting — a medical emergency. If you or someone else has those severe symptoms after eating a collagen jelly stick, call 999 and say “anaphylaxis”; use an adrenaline auto-injector if one is available and prescribed. For anything milder, or if you’re unsure whether a past reaction to fish means you need to avoid fish collagen specifically, that’s a conversation for a GP or allergist, not something this page can answer for you individually.
What you’re actually allowed to claim
None of this is medical advice, and we’re not offering any. In the UK and EU, the only authorised claim connecting a nutrient to collagen is that Vitamin C contributes to normal collagen formation for the normal function of skin. Everything above is documented safety and labelling information, reported as accurately as we can check it — not a diagnosis, not a recommendation for or against any specific product, and not a substitute for an allergist’s advice if you have a known fish allergy.
The honest verdict
If you have a diagnosed fish allergy, treat BB LAB, FOODOLOGY, Cloo9, and HAMCHOROK as a genuine question for your allergist rather than a guess based on what is or isn’t bolded on the listing — the research doesn’t support a blanket “avoid” or “it’s fine” either way. NOW Foods is the one product on our list that’s genuinely fish-free (bovine collagen). YIXO’s vegan claim is plausible but unverified from the brand’s own published ingredients, so check directly with them if a fish-free product specifically is what you need. See our full buying guide for real pricing and dose across all six, our ingredients comparison for how the collagen sources differ more broadly, and our FAQ for other common safety questions.
Sources: Collagen — An Important Fish Allergen for Improved Diagnosis, J Allergy Clin Immunol Pract; Allergy to fish collagen: Thermostability and IgE reactivity across 11 fish species, World Allergy Organization Journal; Food Standards Agency — Food allergen labelling and information requirements; University Hospitals Dorset NHS Foundation Trust — Fish and Shellfish Allergy quick guide.