Last reviewed: 7 May 2026
The sugar alcohol that quietly hits a laxative threshold around 10 g
Sorbitol is a sugar alcohol — a polyol — used as a bulk sweetener, humectant and texturiser across the UK food supply. It carries about 60% of the sweetness of sucrose at roughly 2.6 kcal/g, and the small intestine doesn't absorb it efficiently. What isn't absorbed pulls water into the gut and gets fermented in the colon, which is why intakes around 10 g for adults (and around 5 g for children) typically tip into bloating, flatulence and osmotic diarrhoea. UK and EU rules — Regulation (EC) No 1333/2008, retained in UK law — require any food with more than 10% added polyols to carry the phrase "excessive consumption may produce laxative effects". Sorbitol is also the "P" (Polyols) in FODMAP, which is why low-FODMAP elimination diets routinely cut it out.
Foods with more than 10% added polyols must carry the labelling phrase "excessive consumption may produce laxative effects" under Regulation (EC) No 1333/2008 (retained in UK law). The phrase is the heavy lifter on this additive — there is no numerical ADI; sorbitol sits under quantum satis.
Sorbitol is a six-carbon sugar alcohol — a hexitol — and one of a wider family of polyols used to sweeten and bulk out food. Industrially it's made by hydrogenating glucose: a hydrogen atom is added across the aldehyde group, turning the sugar into its alcohol form. The result is a stable, mildly sweet molecule that resists crystallisation, holds water (it's hygroscopic) and behaves well at high temperatures, which is why manufacturers reach for it.
It also occurs naturally, and not in trace quantities. Stone fruits — pears, apples, prunes, cherries, peaches — carry meaningful amounts. A single pear can contribute roughly 1–2 g of sorbitol on its own, which is why some people find a bowl of fruit produces the same gut response as a packet of sugar-free mints. The molecule is the same whether it comes from an orchard or a hydrogenation reactor.
On the nutrition panel, sorbitol provides about 2.6 kcal/g compared with 4 kcal/g for sucrose, and it sits about 60% as sweet as sugar. Manufacturers use that combination to drop sweetness, calorie load and post-meal glucose response in a single ingredient swap, and to keep products moist on shelf — confectionery, sugar-free chocolate, chewing gum, bakery glazes and certain low-sugar formulations all rely on it.
The defining property of sorbitol isn't sweetness — it's that the small intestine absorbs it slowly and incompletely. Whatever the small intestine doesn't take up keeps moving. Two things happen next, in parallel.
First, the molecule is osmotically active. Sitting in the gut lumen, it pulls water across the gut wall to balance the concentration gradient. More water in the bowel means looser, faster-moving stool. Second, the polyol travels onward into the colon, where the resident bacteria ferment it. Fermentation generates short-chain fatty acids and gases — hydrogen, methane, carbon dioxide — which produce the bloating, audible gurgling and flatulence familiar to anyone who has worked through a bag of sugar-free sweets.
Published clinical and dietetic guidance puts the threshold for noticeable symptoms at around 10 g of sorbitol in a single dose for adults, and roughly 5 g for children. Symptoms scale from there — modest bloating and wind at threshold, osmotic diarrhoea at higher single doses. Individual tolerance varies considerably: gut microbiome composition, transit speed, baseline FODMAP sensitivity and what else is in the meal all move the needle. Two adults eating the same packet can have very different mornings.
UK and EU food law treats polyols as a labelling category. Regulation (EC) No 1333/2008, retained in UK law, requires that any food containing more than 10% added polyols carry the wording "excessive consumption may produce laxative effects". The wording is mandatory; the threshold is set by total added polyol content, not by sorbitol alone.
What this means in practice: a typical sugar-free pellet gum, a sugar-free mint, a "no added sugar" jelly sweet — most of these clear the 10% bar comfortably and will carry the warning. A toothpaste does not need it because toothpaste is a non-food category and the dose ingested per brushing is small. A loaf of bread that uses sorbitol as a humectant at sub-threshold levels is unlikely to carry the phrase.
If you scan the back of a UK pack and see "excessive consumption may produce laxative effects", that's the legally mandated tell that you're holding more than 10% added polyols.
Sorbitol is one of the most-used polyols in the UK food supply. The places it shows up most often, with rough quantities:
The pattern is consistent: any product where the marketing leads on "sugar-free", "no added sugar" or "diabetic" is the most likely place to meet sorbitol at meaningful doses.
FODMAP stands for Fermentable Oligosaccharides, Disaccharides, Monosaccharides And Polyols — short-chain carbohydrates that the small intestine absorbs poorly and the colonic microbiota ferment readily. Sorbitol is the "P". Monash University, the research group that developed and maintains the FODMAP framework, classifies sorbitol-containing foods as high-FODMAP at relevant serving sizes, and low-FODMAP elimination diets remove sorbitol alongside mannitol (E421) during the elimination phase.
Surveys of people with irritable bowel syndrome consistently identify polyols as a frequent symptom trigger. The mechanism is the same osmotic-plus-fermentative pathway that produces threshold symptoms in everyone — IBS just lowers the dose at which the response becomes uncomfortable. There's also a published association with fructose malabsorption: the two share elements of intestinal transport, and people who react to one often co-react to the other.
None of that is medical advice. Whether to do a low-FODMAP elimination, and how to reintroduce, is a clinical decision worth taking to a registered dietitian or your GP. The practical use of this page is to tell you which UK products carry the load, so a conversation with a clinician or a tracking diary has accurate inputs.
Sorbitol has a low glycaemic index. Because most of it isn't absorbed, the fraction that does enter circulation produces a smaller blood glucose response than an equivalent dose of sucrose. That low GI is the reason it appears in products marketed at people watching their carbohydrate intake. It is not a free pass — the calories aren't zero, the laxative effect can mask appetite signals, and the gut response can be considerable. Anyone managing diabetes is best served by working with their NHS diabetes team rather than treating "sugar-free" as automatically interchangeable with "extra".
Sorbitol sits in a family. Each polyol behaves slightly differently:
If you find sorbitol consistently triggers symptoms, the rest of the polyol shelf is likely to do something similar — except erythritol, which most people tolerate at higher doses thanks to that small-intestine absorption.
Cavities form when oral bacteria — chiefly Streptococcus mutans — ferment dietary sugars to acid, which demineralises tooth enamel. Sorbitol can be metabolised by oral bacteria, but only slowly and inefficiently, so the acid load it generates is low compared with sucrose. That's the basis for the dental-health framing on sugar-free gum: chewing for 10–20 minutes after a meal stimulates saliva, doesn't add a sugar substrate the bacteria can rapidly turn into acid, and helps clear food debris. The dental benefit is real; it's also why these gums tend to be among the highest-dose sorbitol products people regularly consume.
The European Food Safety Authority (EFSA), the EU regulator that evaluates food additives, has reviewed sorbitol multiple times. There is no numerical Acceptable Daily Intake; the regulator uses the term quantum satis — meaning "as much as needed to achieve the technical effect, no more". The labelling requirement at >10% added polyols is the operative consumer-facing control. EFSA's 2017 reassessment of polyols confirmed acceptable use under that framework; the picture in 2026 hasn't materially changed. Practically, the regulatory message is: there's no toxic dose at issue, but the gut effects scale with intake, and the labelling rule is how that's communicated to shoppers.
On a UK pack, sorbitol can show up under several names. In the ingredients list it appears as "sorbitol", sometimes "sorbitol syrup", or by its E-number "E420". The carbohydrate panel often breaks polyols out separately — look for a line like "of which polyols" or "polyols (sorbitol)" under "Carbohydrate". Anything carrying the phrase "excessive consumption may produce laxative effects" contains more than 10% added polyols, of which sorbitol is the most common. The polyol panel line is the fastest way to estimate dose per serving without scrutinising the ingredient list.
We surface E420 on every UK barcode you scan in NutraSafe, alongside the rest of the polyol family — mannitol, maltitol, xylitol, erythritol — and flag polyol content above the labelling threshold so you can spot the products that will carry the laxative warning before you check the back of the pack. The aim is to make the dose visible at the point of decision, not after.
Scan any UK barcode in NutraSafe and we surface sorbitol and the rest of the polyols alongside the additives. Free to log up to 25 foods/day · NutraSafe Pro £3.99/month for AI Coach, allergen warning detail and full reaction history.
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