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Moderate evidenceGeneral health

Xylitol

A sugar alcohol that oral bacteria cannot ferment. Used as a sugar replacement it reduces cavities, and chewing gum containing it modestly reduces ear infections in children.

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What the science says

  • Fewer cavities when it replaces sugar Moderate evidence

    A systematic review and meta-analysis of sugar substitutes for caries prevention in permanent teeth of children and adolescents found lower caries increments with xylitol and other non-fermentable sweeteners. Much of the benefit appears to come from displacing sugar rather than from a unique property of xylitol, and trial quality is mixed.

  • Fewer episodes of acute otitis media Moderate evidence

    A Cochrane review found that xylitol chewing gum, lozenges or syrup reduced the occurrence of acute otitis media in healthy children by roughly a quarter compared with control. The evidence was rated moderate quality and the benefit was not seen in children who were already unwell.

  • Cardiovascular signal worth noting Limited evidence

    Observational and mechanistic work has linked higher circulating xylitol with platelet reactivity and cardiovascular events. This is preliminary and not from randomised trials, but it is a reason not to consume large quantities habitually.

Dosage & safety

Studied doseCaries and otitis media trials used roughly 5–10 g/day divided across at least three occasions, usually as gum or lozenges after meals. Occasional use does not appear to work; the frequency matters more than the total.
SafetyAbove about 30–50 g/day it commonly causes gas, bloating and osmotic diarrhoea, and tolerance varies widely. Xylitol is severely toxic to dogs even in small amounts, causing hypoglycaemia and liver failure, so keep products away from pets. The emerging cardiovascular association is unresolved.

How to take it

TimingFrequency is what works: use it after meals at least three times a day, and occasional use appears to do nothing.
With food?Use it after eating, as gum or a lozenge, so the xylitol stays in contact with the teeth when bacteria are most active.
Worth knowingKeep every xylitol product away from dogs — a few grams can cause hypoglycemia and liver failure, and chewing gum left in a bag is the usual way it happens.

Interactions

With other supplements

  • other sugar alcohols (erythritol, sorbitol, maltitol)

    Additive osmotic load causing gas, bloating and diarrhoea well below each one's individual threshold. count them together when judging your tolerance

  • magnesium citrate or magnesium oxide

    Both draw water into the bowel, so the laxative effect compounds. reduce one if stools loosen

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does xylitol prevent cavities?

Yes, when xylitol replaces sugar — the evidence is moderate. A meta-analysis found lower caries increments in children and adolescents, though much of the benefit seems to come from displacing sugar and trial quality is mixed.

Does xylitol gum prevent ear infections in children?

A Cochrane review found xylitol gum, lozenges or syrup cut acute otitis media in healthy children by roughly a quarter, rated moderate-quality evidence. The benefit was not seen in children who were already unwell.

How much xylitol per day for teeth?

Trials used roughly 5–10 g/day of xylitol divided across at least three occasions, usually as gum or lozenges after meals. Frequency matters more than the total, and occasional use does not appear to work.

Does xylitol have side effects?

Above about 30–50 g/day, xylitol commonly causes gas, bloating and diarrhoea, and a preliminary observational signal links high circulating xylitol with cardiovascular events. Xylitol is also severely toxic to dogs, so keep every product away from pets.

Scientific references

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