Sorbitol

What It Is

Sorbitol is a sugar alcohol, or polyol, used in sugar-free hard candy, cough drops and chewing gum, and in many liquid medicines. In the same 16-sweetener sensory panel used on this site for maltitol, erythritol and xylitol, it matched sugar at 0.72 to 0.83 times its sweetness. Handbooks often quote lower figures, about 0.5 to 0.6, without a traceable measurement, so we use the measured one. In the EU it is E 420, which covers crystalline sorbitol and sorbitol syrup.

Its trade-off is the opposite of maltitol’s. Sorbitol barely moves blood glucose, but it carries more calories than any other single polyol, and it is the hardest of them on the gut.

Blood Glucose and Calories

A 2003 review pooled ten studies and put sorbitol’s glycaemic index at 9 (glucose = 100; sucrose 65 in the same review), with an insulin index of 11. The studies used 20 to 50 g doses, in healthy people and in people with type 1 and type 2 diabetes. These are pooled figures from older studies, not a modern standardised GI test. The review was commissioned by the European Polyol Association, and it is the source of every polyol GI on this site.

A low GI does not make it calorie-free. FDA’s factor for sorbitol is 2.6 kcal per gram, the highest of any single polyol in FDA’s table, above xylitol’s 2.4 and maltitol’s 2.1. The EU uses 2.4 kcal/g for every polyol except erythritol. Absorption varies widely: “Estimates of absorption from oral solutions range from 25 to 80 % of the ingested dose”. What is absorbed is converted in the liver to fructose, and then to glycogen or glucose “that may be slowly released into the bloodstream”.

That is why this site counts half of sorbitol’s grams toward net carbs, the same treatment as xylitol and maltitol. A polyol with measurable energy is not subtracted in full here. On a US label sorbitol sits inside Total Carbohydrate but not under Total Sugars or Added Sugars. A separate Sugar Alcohol line is voluntary unless the label makes a claim about sugars or sugar alcohols.

Tolerance: Lower Than Most People Expect

Sorbitol causes gut symptoms at lower doses than any other polyol on this site:

• Hyams 1983 (7 healthy volunteers): in most subjects, “as little as 5 g sorbitol was associated with a significant increase in breath hydrogen”, a sign that it was not fully absorbed. “Most subjects experienced mild gastrointestinal distress (gas, bloating) after 10 g and severe symptoms (cramps, diarrhea) after 20 g.”
• Jain 1985 (42 adults, 10 g): clinical intolerance in 43% of white and 55% of non-white subjects. Severe intolerance was 32% in non-white subjects against 4% in white subjects.
• Yao 2014 (Monash University, double-blind, 10 g): only 33% of healthy people and 40% of people with irritable bowel syndrome absorbed it completely. Symptoms rose significantly in the IBS group only, and did not depend on how much was absorbed.

All three trials gave single doses in solution on an empty stomach, and are read here from their abstracts. Nothing we opened measured sorbitol eaten with food through the day, which is how most people meet it. For medicines, the European Medicines Agency keeps an adult laxative-warning threshold of 10 g, proposes 140 mg/kg a day for all patients, and notes that children can be more sensitive.

Sorbitol is also classed as a polyol FODMAP, which matters if you have irritable bowel syndrome.

Laxative Labels: Two Rules, Two Triggers

Sorbitol is the only polyol on this site with a US laxative-label rule. 21 CFR 184.1835(e): food “whose reasonably foreseeable consumption may result in a daily ingestion of 50 grams of sorbitol” must say “Excess consumption may have a laxative effect.” In the EU, any food with more than 10% added polyols must say “excessive consumption may produce laxative effects”.

The two triggers measure different things: a daily intake in the US, a concentration in the EU. And the US one, 50 g a day, is 2.5 to 5 times the 10 to 20 g at which the trials above found symptoms.

Fructose and the Liver

The EMA: “Sorbitol is rapidly converted to fructose by sorbitol dehydrogenase in the liver.” That makes it a concern for anyone with hereditary fructose intolerance. Medicines containing sorbitol carry a warning for it, which the EMA strengthened in 2017 because it judged the old warning insufficient for undiagnosed small children. The same guidance finds sorbitol in medicines “not expected to affect the glycaemia in patients with diabetes mellitus”, at medicine doses, not food doses. It also notes that some sorbitol-containing liquid medicines change how other drugs taken with them are absorbed.

The Cardiovascular Question

A Nurses’ Health Study analysis (Heianza and colleagues; 762 women who developed coronary heart disease and 762 who did not) found that higher blood levels of mannitol/sorbitol were associated with heart disease: a relative risk of 1.16 (95% CI 1.05 to 1.28) per standard deviation, after adjusting for diet quality, lifestyle and body fat. Comparing the highest quarter with the lowest, the risk was 1.42 (1.05 to 1.91), even with diabetes in the model.

This is an association, not evidence that eating sorbitol causes heart disease, and it has three specific limits:

• The assay could not tell sorbitol from mannitol; they “were not chromatographically separated”.
• The body makes sorbitol itself: “When glucose levels are elevated, glucose is also metabolized to sorbitol”. So blood levels partly track blood glucose, not diet.
• The study did not analyse anyone’s sorbitol intake.

The same study measured erythritol and found an association of the same size, 1.15 per standard deviation. In that study erythritol’s association weakened to non-significance once diabetes was added to the model, while mannitol/sorbitol’s stayed significant. That does not clear erythritol: a larger cohort still links blood erythritol with heart failure and cardiovascular death, and three genetic (Mendelian randomisation) studies report positive associations while one review cites null ones. The erythritol page covers them. Three of this study’s authors are employees, executives or shareholders of Sapient Bioanalytics, which ran the assays. It was NIH-funded.

Regulatory Status

• US: GRAS affirmed in FDA’s own regulations, 21 CFR 184.1835, since 1977. It is permitted as a sweetener, humectant, texturizer and stabiliser, up to 99% of hard candy and cough drops and 12% of most other foods. Unlike maltitol, its US status is settled by regulation.
• JECFA (the joint FAO/WHO expert committee): ADI “not specified” for sorbitol (1982). No ADI was allocated for sorbitol syrup in 1988.
• EU: authorised as E 420 through the polyols group, at quantum satis in energy-reduced or no-added-sugar foods. Crystalline E 420 must be at least 91% D-sorbitol; “sorbitol syrup” may be a mixture of sorbitol, mannitol and hydrogenated saccharides. EFSA’s re-evaluation is still ongoing, years past the EU’s 2020 deadline for sweeteners; EFSA said in July 2026 that its exposure assessment “will start early 2027”.

Baking and Teeth

Sorbitol is not a reducing sugar, so it has no Maillard browning route. Yet a controlled biscuit study found it “unexpected that sorbitol and maltitol biscuits are, after all, exceptionally colourful”. It browns less than sugar, not never.

Sorbitol is named in the US dental-caries health claim, whose wording is candid: these sweeteners “are slowly metabolized by bacteria to form some acid”. Less acid than sugar, not none. In xylitol trials, sorbitol gum is usually what xylitol is tested against. The EU’s tooth-mineralisation and “lower blood glucose rise” claims for sugar replacers both name it, and both are comparisons with sugar.

Comparison Note

Against maltitol: a much lower GI (9 against 35) but more calories (2.6 against 2.1 kcal/g) and symptoms from about 10 g in one dose. Against erythritol: erythritol has a GI of 0 and 0 kcal/g on a US label, and an EU ADI set on diarrhoea at 0.5 g/kg a day; both have blood-level associations with heart disease that cannot separate diet from the body’s own production, and for erythritol a 2024 trial also found that a 30 g dose raised platelet reactivity. Against xylitol: xylitol is sweeter, and is the polyol sorbitol gum is usually compared with in dental trials.

What would change this page: EFSA finishing its E 420 re-evaluation; a modern standardised GI test; tolerance measured with food through the day; or a cardiovascular study that separates dietary sorbitol from mannitol and from the sorbitol the body makes itself.