The Best Low-FODMAP Stock Cubes in the UK: Every Label, Checked

Why stock cubes are the hardest swap in British cooking

Gravy, soup, risotto, casserole, a midweek bolognese — British home cooking runs on stock, and stock in most kitchens means a cube. The problem is what a cube actually is: dehydrated, concentrated flavour. And the flavours manufacturers reach for first are onion and garlic. On almost every label we've checked, one or both appear, usually high up the list.

Worse, you can't pick around it. Fructans — the fermentable carbs in onion and garlic — dissolve into water. Fish an onion chunk out of a stew and most of its fructans stay behind in the liquid; with a stock cube, dissolving into the liquid is the entire job description.

The ranking: four labels, checked word by word

First place: Kallo Organic Chicken, scoring 40 (moderate) — the cleanest mainstream cube we've found. Onion sits dead last on the ingredients list, which under UK labelling rules means it's the smallest ingredient by weight. No wheat, no garlic, no celery. The full check lives at /products/kallo-stock-cubes.

Second: Knorr Chicken at 55. It carries onion powder and celery seed, but both sit near the end of the list, and it dodges wheat and garlic entirely. A workable fallback when Kallo isn't on the shelf — details at /products/knorr-stock-cubes.

Third: Oxo Beef at 65, which fails both of our screens at once — wheat flour is the second ingredient, and onion appears twice on the same label (/products/oxo-cubes). And in last place, the shock: Marigold Swiss Vegetable Bouillon at 72. The health-shop favourite packs onion, leek, garlic, lactose and celery seed into one green tub — five separate triggers (/products/marigold-bouillon).

The truly clean options — and where to find them

If you want a cube with no asterisks at all, look past the supermarket stock aisle. Massel, an Australian brand, makes stock cubes and powders without any onion or garlic — that's on the label, not marketing spin. In the UK you'll find them on Amazon and in some health-food shops, and they're a cupboard staple in plenty of low-FODMAP kitchens for exactly this reason.

The other clean option costs almost nothing: make stock once, then freeze it in ice-cube trays. Simmer chicken bones or wings with carrot, the green tops of leeks and spring onions (the green parts are the gentler end of both plants), peppercorns and a bay leaf. Two frozen cubes dropped into a pan do exactly what a shop cube does — minus everything you were trying to avoid.

How to screen any cube yourself

UK ingredient lists are ordered by weight, so position is evidence. Onion as the second ingredient is a completely different proposition from onion in last place — same word, wildly different dose. That single rule is most of why Kallo and Oxo end up twenty-five points apart.

Two more checks. 'Flavourings' is the label's grey area — it can legally contain concentrated plant extracts you'd want to know about, so an otherwise-clean list with a vague 'natural flavourings' entry is a maybe, not a pass. Celery is the opposite: it's one of the UK's fourteen regulated allergens, so it must be declared, usually in bold. If celery seed is in the cube, the label can't hide it — a rare case of the law doing your label-reading for you.

The dilution maths the label doesn't show

Here's the part most label-reading guides skip: a cube's ingredients list describes the cube, not your bowl. One 10g cube dissolves into 450–500ml of water, and your serving is maybe half of that pot. So the onion at the bottom of Kallo's list — already the smallest ingredient in a 10g cube — reaches your plate as a fraction of a fraction of a gram.

That's why a ranking beats a blunt pass/fail. A trace of onion diluted across a family-sized casserole is a genuinely small dose, and many people report that level sits fine. Marigold's five-trigger blend doesn't earn the same benefit of the doubt — dilution shrinks a dose, but it can't shrink five of them at once.

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