Food & Drink / Compounds / Xylitol

Xylitol in food: ingestion safety

Severe risk

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Acute insulin-secretion-driven hypoglycemia and acute hepatic failure in dogs from xylitol ingestion; canonical ASPCA APCC pet-toxicity case category. Sugar-free gum, dental products, and peanut-butter formulations are the documented exposure sources; even small servings can be lethal in dogs.

What is xylitol?

Xylitol is a sugar alcohol, sweetener, food additive.

The IUPAC name is (2R,3r,4S)-pentane-1,2,3,4,5-pentol.

Also known as: (2R,3r,4S)-pentane-1,2,3,4,5-pentol, birch sugar, wood sugar, E967.

IUPAC name
(2R,3r,4S)-pentane-1,2,3,4,5-pentol
CAS number
87-99-0
Molecular formula
C5H12O5
Molecular weight
152.15 g/mol
SMILES
C(C(C(C(CO)O)O)O)O
PubChem CID
6912

Risk for people

Severe risk

Acute insulin-secretion-driven hypoglycemia and acute hepatic failure in dogs from xylitol ingestion; canonical ASPCA APCC pet-toxicity case category. Sugar-free gum, dental products, and peanut-butter formulations are the documented exposure sources; even small servings can be lethal in dogs.

Regulatory consensus

3 regulatory and scientific bodies have classified Xylitol. The classifications differ — that's the data.

AgencyYearClassificationNotes
FDA2019Generally Recognized as Safe (GRAS) for human consumptionApproved as food additive and sweetener
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 4 positive / 7 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 4 positive / 7 negative reports)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where you encounter xylitol

  • Sugar Free Gum — Ice Breakers, Trident, Orbit, Mentos Pure Fresh
    Most common source of dog toxicity - a single piece can be toxic to small dogs
  • Sugar Free Candy — Sugar-free mints, sugar-free chocolate
    Check labels - often contains xylitol
  • Baked Goods — Sugar-free cookies, diabetic desserts, keto products
    Increasingly common in low-carb/keto baked goods
  • Peanut Butter — Some sugar-free brands, "natural" brands (occasionally)
    CRITICAL: Some peanut butter brands now contain xylitol - always check labels before giving to dogs
  • Medications — Some chewable vitamins, melatonin gummies, prescription medications
    Can contain xylitol as sweetener
  • Oral Care — Sugar-free toothpaste, mouthwash, dental products
    Common in human oral care products
  • Food — processed food, beverages, candy, baked goods

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Xylitol:

  • Stevia (for human use) — Effective sweetener, appears safe for dogs in small amounts
    Trade-offs: Different taste profile than xylitol
    Relative cost: 1.2-2×
  • Erythritol (for human use) — Sugar alcohol like xylitol but appears safer for dogs
    Trade-offs: May still cause GI upset in large amounts. Less data on dog safety.
    Relative cost: 1.2-2×

Frequently asked questions

Is xylitol safe for you?

Acute insulin-secretion-driven hypoglycemia and acute hepatic failure in dogs from xylitol ingestion; canonical ASPCA APCC pet-toxicity case category. Sugar-free gum, dental products, and peanut-butter formulations are the documented exposure sources; even small servings can be lethal in dogs.

What products contain xylitol?

Xylitol appears in: Ice Breakers (sugar free gum); Trident (sugar free gum); Sugar-free mints (sugar free candy); sugar-free chocolate (sugar free candy); Sugar-free cookies (baked goods).

Why do regulators disagree about xylitol?

Xylitol has been classified by 3 agencies including FDA, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Xylitol in the food app

Look up products containing xylitol, compare to alternatives, and explore the full data record.

Open in food View raw API data

Sources (4)
  1. FDA GRAS Notice - Xylitol (2019) — fda
  2. Gastrointestinal Tolerance of Xylitol in Humans — clinical
  3. ASPCA Animal Poison Control - Xylitol Toxicity — vet
  4. Xylitol Toxicosis in Dogs (2006) — vet

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for medical, legal, or regulatory advice. Why we built ALETHEIA →