Xylitol

Pronunciation: ZY-lih-tol.

Generic name
Xylitol
Drug class
Sugar alcohol (polyol); permitted food additive and sweetener (not an approved drug)
Form
Crystalline powder/granules, or as an ingredient in gum, mints, toothpaste, mouthwash, baked goods, and some medicines/supplements
Route
Oral (food, oral-care products, chewable supplements)
Legal status
Permitted food additive/sweetener in every market reviewed -- Generally Recognized As Safe (GRAS) in the United States; E967 under EU Regulation (EC) No 1333/2008 and its UK-retained equivalent (authorised in Great Britain); within Health Canada's permitted-sweeteners framework in Canada; and INS 967 under the Australia New Zealand Food Standards Code (FSANZ) in Australia and New Zealand. Not an approved prescription or over-the-counter drug anywhere reviewed.

Availability and supply rules vary by country

Trade names by country: United States · United Kingdom · Canada · Australia · New Zealand

Australia: Xylitol (INS 967, generic food-additive/sweetener ingredient) (7) · Full directory

What Xylitol is and how it works

Xylitol is a sugar alcohol (a type of low-calorie sweetener) used in place of sugar in gum, mints, toothpaste, baked goods, and some medicines and supplements. It has about 40% fewer calories than sugar, does not cause the same rapid blood-sugar rise as sugar, and helps reduce tooth decay because the bacteria that cause cavities cannot use it as a fuel source. It is a permitted food additive in every market reviewed, not an approved drug. (1) (2)

For people, xylitol is generally well tolerated, though eating a lot of it in one go -- roughly above 30-50 grams a day for most adults -- can cause bloating, gas, and a laxative (loose-stool) effect, because unabsorbed xylitol draws water into the gut. There is an important, separate safety fact that has nothing to do with human use: xylitol is genuinely dangerous to dogs (and ferrets), even in small amounts, because it triggers a rapid insulin release in these animals that can cause severe low blood sugar and, less commonly, liver damage. This does not happen in people -- the US FDA states plainly that human consumption poses no comparable risk -- but because xylitol is in so many everyday human products (gum, toothpaste, some peanut/nut butters, medicines), it is important to keep these products away from pets.

Mechanism of action: how Xylitol works

Xylitol is a five-carbon sugar alcohol (polyol) that is only partially absorbed in the small intestine; unabsorbed xylitol reaches the colon, where it exerts an osmotic effect (drawing water into the bowel) and is fermented by gut bacteria, producing gas -- the basis of its dose-dependent human GI effects. In dogs (unlike humans), xylitol is rapidly absorbed and triggers a potent, glucose-independent release of insulin from the pancreas, causing profound hypoglycemia; a separate, incompletely understood, idiosyncratic hepatotoxic mechanism (implicating reactive oxygen species) has been proposed for the acute liver injury seen in some dogs. (1) (2)

What Xylitol is used for

Low-calorie sugar substitute

Used in place of sugar to sweeten food, drinks, gum, and confectionery with fewer calories and a lower impact on blood glucose than sugar. (1)

Dental/oral-care use to help reduce tooth decay

Used in chewing gum, mints, and toothpaste because the bacteria that cause tooth decay (e.g. Streptococcus mutans) cannot metabolise it, so it does not feed the acid-producing plaque process the way sugar does. (5)

Ingredient in some medicines and supplements

Used as a sweetening excipient in some over-the-counter medicines (e.g. cough syrup), chewable vitamins, and dietary supplements. (2)

Before taking Xylitol

Do not take / not appropriate for

  • There is no specific contraindication to ordinary dietary xylitol use identified in the sources reviewed for this dossier; as with any sugar alcohol, very large amounts can cause digestive upset in anyone. (all countries) (1)

Tell your clinician about

  • If you have irritable bowel syndrome or another condition where digestive upset from sugar alcohols is a particular concern.
  • If you are introducing xylitol-sweetened products to your diet for the first time and want individualised guidance, especially at higher intended intakes.
  • This section covers ordinary human dietary/oral-care use -- it does NOT apply to pets. If you have a dog, cat, or ferret in the household, see the dedicated pet-safety warning below, since this is a genuinely different, species-specific risk that your veterinarian (not your own clinician) should be consulted about.
(1) (2)

How to take Xylitol

  • Used as a sugar substitute in food, drinks, or oral-care products, or found as an ingredient in gum, mints, baked goods, or some medicines/supplements -- there is no single 'dose' the way there is for a medicine.
  • If introducing xylitol to your diet for the first time, most guidance suggests starting with a small amount (roughly 3-5 grams a day) and increasing gradually, to assess personal digestive tolerance.
  • Most adults tolerate around 10-20 grams a day without symptoms; amounts above roughly 30-50 grams a day are more likely to cause bloating, gas, or a laxative effect.
(1)

Procedures and treatment changes

Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (1) (2) (3) (4) (5) (6) (7)

Missed dose

Not applicable -- xylitol is a food/sweetener ingredient used as needed or as part of a product's regular formulation, not a scheduled medicine dose.

Overdose

In humans, consuming a very large amount of xylitol in one sitting is most likely to cause uncomfortable but not dangerous digestive symptoms -- bloating, gas, abdominal cramping, and diarrhoea -- which typically resolve on their own as the excess is cleared. Drinking water and waiting out the symptoms is usually sufficient; seek medical advice if symptoms are severe or persistent. This guidance is for humans only -- if a dog, cat, or ferret has eaten a xylitol-containing product, this is a veterinary emergency (see the pet-safety warning below), not a situation to manage the way a human digestive upset would be managed. (1)

Side effects

Side effects and their urgency vary; report severe, persistent, or concerning symptoms.

Bloating.

What to notice: Bloating.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Gas (flatulence).

What to notice: Gas (flatulence).

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Abdominal rumbling/cramping (borborygmi).

What to notice: Abdominal rumbling/cramping (borborygmi).

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Loose stools or diarrhoea (an osmotic laxative effect), particularly at higher intakes.

What to notice: Loose stools or diarrhoea (an osmotic laxative effect), particularly at higher intakes.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Serious warnings

IMPORTANT PET SAFETY WARNING: Xylitol is toxic to dogs and ferrets (a real, FDA-published warning -- this does NOT apply to humans) — critical_pet_safety_not_human_risk

Symptoms: In dogs: vomiting, followed by weakness, decreased activity, staggering or loss of coordination, collapse, and seizures, usually beginning within 10-60 minutes of ingestion. Separately, and less commonly, dogs can develop acute liver injury (decreased appetite, lethargy, yellowing of the skin/eyes, vomiting, diarrhoea), which may not become apparent for two to three days after ingestion. Ferrets face similar hypoglycemia and seizure risks to dogs.

Action: This is a genuine, serious, well-documented veterinary emergency, not a human safety concern -- the FDA states explicitly that 'human consumption poses no comparable risk.' Xylitol appears in many everyday human products (sugarless gum, mints, sugar-free candy, baked goods, cough syrup, chewable vitamins, mouthwash, toothpaste, some nut butters, over-the-counter medicines, and dietary supplements), so keep any xylitol-containing product safely out of reach of dogs and ferrets. If a dog or ferret has eaten a xylitol-containing product, contact a veterinarian, emergency animal clinic, or animal poison control centre immediately -- do not wait for symptoms to appear. Cats appear to be largely spared, likely due to a natural aversion to sweets. (2) (3)

Human gastrointestinal upset / laxative effect (dose-dependent) — low_caution

Symptoms: Bloating, gas, abdominal cramping, loose stools or diarrhoea.

Action: A real, dose-dependent, and generally self-limiting effect in humans, not a sign of a dangerous reaction. If you experience these symptoms, reducing your xylitol intake or spreading it out over the day usually resolves them; there is no comparable serious human safety signal in the sources reviewed for this dossier. (1)

Interactions

  • No significant drug-interaction data were identified in the human-safety sources reviewed for this dossier; xylitol's main human effect at high intake is gastrointestinal, not a pharmacological drug interaction. (1)

Pregnancy, breastfeeding, kidney/liver function, age

Pregnancy

No specific pregnancy safety concern was identified in the sources reviewed for this dossier, beyond the same general dose-dependent digestive-upset consideration that applies to anyone. (1) (2) (3) (4) (5) (6) (7)

Breastfeeding

No specific breastfeeding safety concern was identified in the sources reviewed for this dossier. (1) (2) (3) (4) (5) (6) (7)

Children

Used in some children's chewable vitamins and oral-care products; the same dose-dependent digestive-upset consideration applies, generally at a lower absolute gram threshold for smaller children. (1) (2) (3) (4) (5) (6) (7)

Elderly

No specific elderly-population safety concern was identified in the sources reviewed for this dossier, beyond the same general dose-dependent digestive-upset consideration. (1) (2) (3) (4) (5) (6) (7)

Hepatic_impairment

No specific human hepatic-impairment safety concern was identified in the sources reviewed for this dossier -- the well-documented liver-injury signal in the evidence reviewed is specific to dogs, not humans. (1) (2) (3) (4) (5) (6) (7)

Renal_impairment

No specific human renal-impairment safety concern was identified in the sources reviewed for this dossier. (1) (2) (3) (4) (5) (6) (7)

Monitoring

Before starting

  • No specific pre-use monitoring is required for ordinary dietary/oral-care xylitol use in humans.

During treatment

  • Simply note your own digestive tolerance and moderate intake if bloating, gas, or loose stools occur.
  • Households with dogs, cats, or ferrets should store xylitol-containing products (including gum, mints, toothpaste, and certain medicines/supplements) safely out of pet reach at all times.
(1) (2)

Storage

Store as you would any food/sweetener product or its specific packaged form (gum, toothpaste, supplement bottle), away from moisture, and -- given the real, serious pet-toxicity risk -- always out of reach of dogs, ferrets, and other pets.

Professional information

Clinician-facing context only, sourced from the FDA and UK FSA regulatory references reviewed for this dossier; verify against current regulatory guidance before making specific recommendations.

United States

Indication: Permitted GRAS sugar-alcohol sweetener/food additive

Dose summary: No medicinal dose; typical human GI tolerance threshold approximately 30-50 g/day, with a majority of subjects in one dose-ranging study experiencing bloating/diarrhoea at 50 g.

Renal context: No specific renal-dosing guidance identified in the sources reviewed. (1)

United Kingdom / European Union

Indication: Permitted food additive/sweetener (E967), quantum satis basis

Dose summary: No fixed maximum level set under EU Regulation (EC) No 1333/2008/UK-retained equivalent; no Acceptable Daily Intake (ADI) established.

Renal context: No specific renal-dosing guidance identified in the sources reviewed. (4) (5)

Mechanism of action

Hepatic guidance

No specific human hepatic pharmacology note identified in the sources reviewed; the documented hepatotoxicity signal in the evidence reviewed is specific to dogs.

Overdose note

In humans, manage supportively (hydration, symptomatic relief) for GI upset; not typically a medical emergency. In dogs/ferrets, xylitol ingestion IS a medical emergency requiring urgent veterinary evaluation, glucose monitoring/support, and liver-function monitoring where indicated. (1) (2)

Frequently asked questions

Is xylitol safe for people?

Yes, generally. Xylitol is a permitted food additive (Generally Recognized As Safe in the US, and approved under equivalent frameworks in the UK, EU, Canada, and Australia/New Zealand), and is generally well tolerated by people. The main real side effect is a dose-dependent digestive one -- bloating, gas, or a laxative effect -- that tends to appear at higher intakes, roughly above 30-50 grams a day for most adults. (1)

Is xylitol safe for dogs?

No -- and this is an important, genuine safety warning, not a myth. Xylitol is toxic to dogs (and similarly to ferrets), because it triggers a rapid, potent release of insulin in these species that can cause severe, life-threatening low blood sugar within 10 to 60 minutes of ingestion. A separate, less common but serious risk of acute liver failure has also been documented in dogs. The US FDA has published its own consumer warning about this specific risk, precisely because xylitol is found in so many everyday human products -- sugarless gum, mints, toothpaste, some nut butters, and certain medicines and supplements. If your dog or ferret eats anything containing xylitol, contact a veterinarian, emergency animal clinic, or animal poison control centre immediately. (2) (3)

Why is xylitol dangerous for dogs but not for people?

The difference is biological, not a matter of dose. In humans, xylitol does not trigger the pancreas to release insulin, so it does not cause the blood-sugar crash seen in dogs. In dogs, xylitol is absorbed into the bloodstream more quickly and can prompt a much stronger insulin release, leading to a rapid and dangerous drop in blood sugar. The FDA states this plainly: human consumption poses no comparable risk. (2)

Is xylitol available/approved in the US, UK, Europe, Canada, Australia, and New Zealand?

Yes. As a food additive/sweetener (not a drug), xylitol is permitted in all six markets reviewed: the United States (FDA GRAS), the United Kingdom (E967, GOV.UK/FSA register), the European Union (E967 under Regulation (EC) No 1333/2008), Canada (within Health Canada's permitted-sweeteners framework), and Australia and New Zealand (INS 967 under the FSANZ Food Standards Code). (1) (4) (5) (6) (7)

Can xylitol cause liver failure in people?

No credible, well-documented reports of xylitol-induced liver failure in humans were found in this review. The well-documented liver-injury risk described in the veterinary literature is specific to dogs, where it is a separate, idiosyncratic reaction distinct from the more common hypoglycemia risk. This does not apply to typical human dietary or oral-care use of xylitol. (3)

What is the mechanism of action of Xylitol?

Xylitol is a five-carbon sugar alcohol (polyol) that is only partially absorbed in the small intestine; unabsorbed xylitol reaches the colon, where it exerts an osmotic effect (drawing water into the bowel) and is fermented by gut bacteria, producing gas -- the basis of its dose-dependent human GI effects. In dogs (unlike humans), xylitol is rapidly absorbed and triggers a potent, glucose-independent release of insulin from the pancreas, causing profound hypoglycemia; a separate, incompletely understood, idiosyncratic hepatotoxic mechanism (implicating reactive oxygen species) has been proposed for the acute liver injury seen in some dogs. (1) (2)

What is the generic name of Xylitol?

The generic name is Xylitol. (1) (4)

What class of drug is Xylitol?

Xylitol is classed as: Sugar alcohol (polyol); permitted food additive and sweetener (not an approved drug). (1) (4)

References

  1. Aspartame and Other Sweeteners in Food (sugar alcohols section, including xylitol)U.S. Food and Drug Administration -- Food Additives and Petitions · United States · accessed 2026-07-31 · source 1
  2. Paws Off Xylitol; It's Dangerous for DogsU.S. Food and Drug Administration -- Consumer Updates · United States (global relevance: a human-health regulator's own animal-safety consumer warning) · accessed 2026-07-31 · source 2
  3. Acute hepatic failure and coagulopathy associated with xylitol ingestion in dogs (case series); Xylitol Toxicosis in Dogs: An Update; ASPCA/Cornell/Merck xylitol-toxicity guidancePeer-reviewed veterinary literature (Journal of the American Veterinary Medical Association; Journal of Medical Toxicology) and veterinary-institution safety pages (Cornell University College of Veterinary Medicine; Merck Veterinary Manual; ASPCA Animal Poison Control Center) · Not country-specific -- veterinary/toxicology literature and animal-welfare-organisation guidance · accessed 2026-07-31 · source 3
  4. E 967 (Xylitol) -- Authorised Regulated Food and Feed Products for Great BritainFood Standards Agency (FSA), United Kingdom -- Retained/Assimilated EU Law Register of Food Additive Authorisations · United Kingdom · accessed 2026-07-31 · source 4
  5. Regulation (EC) No 1333/2008 of the European Parliament and of the Council on food additives -- E967 XylitolEuropean Union -- Regulation (EC) No 1333/2008 on food additives · European Union · accessed 2026-07-31 · source 5
  6. Lists of Permitted Food Additives -- sweetener table (Food and Drug Regulations, Division 16 / B.16.100)Health Canada -- Food and Drug Regulations (Division 16, sweetener provisions) and List of Permitted Sweeteners · Canada · accessed 2026-07-31 · source 6
  7. Food additives - numerical list (INS 967, Xylitol) and Schedule 15 (Substances that may be used as food additives)Food Standards Australia New Zealand (FSANZ) -- Australia New Zealand Food Standards Code · Australia and New Zealand · accessed 2026-07-31 · source 7

Brand names by country

Single-ingredient Xylitol names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.

Priority countries

United States

  • Xylitol (generic food-additive/sweetener ingredient; GRAS) (1)FDA permitted sugar alcohol sweetener confirmed · food-grade ingredient, no medicinal strength · not brand-specific -- a generic permitted food additive

United Kingdom

  • Xylitol (E967, generic food-additive/sweetener ingredient) (4)FSA govuk register confirmed · food-grade ingredient, no medicinal strength · not brand-specific

Canada

  • Xylitol (generic food-additive/sweetener ingredient) (6)HealthCanada permitted sweeteners framework confirmed · food-grade ingredient, no medicinal strength · not brand-specific

Australia

  • Xylitol (INS 967, generic food-additive/sweetener ingredient) (7)FSANZ numerical additive list confirmed · food-grade ingredient, no medicinal strength · not brand-specific

New Zealand

  • Xylitol (INS 967, generic food-additive/sweetener ingredient) (7)FSANZ numerical additive list confirmed · food-grade ingredient, no medicinal strength · not brand-specific
View brands in additional countries.

European Union

Xylitol (E967, generic food-additive/sweetener ingredient) (5)