At a Glance
- both maltitol and xylitol are sugar alcohols (polyols) used as sugar substitutes in sugar-free and reduced-calorie products
- they are not the same thing, they have different structures, different glycemic indices, different calorie counts, and different safety profiles
- xylitol has a GI of around 7 to 13 and 2.4 calories per gram, maltitol has a GI of 35 to 52 depending on form and contains 2 to 3 calories per gram
- xylitol has well-documented dental benefits including actively reducing cavity-causing bacteria, maltitol is tooth-friendly but less potent on that front
- a 2024 Cleveland Clinic study in the European Heart Journal found high xylitol blood levels associated with about 50% higher cardiovascular event risk and enhanced platelet clotting in humans
- this cardiovascular finding is concerning but not definitive, causal relationship is not established and other researchers have challenged the interpretation
- xylitol is highly toxic to dogs, maltitol is not to the same degree
- both cause digestive issues at higher doses, bloating, gas, and laxative effects
If you read ingredient labels on sugar-free chocolate, keto gummies, or sugar-free gum, you’ll run into both maltitol and xylitol regularly. They get grouped together as “sugar alcohols” and that can make them sound interchangeable. They’re not. They behave differently in your body, have meaningfully different effects on blood sugar, offer different dental benefits, and have different safety considerations that matter quite a bit depending on your situation.
Starting with the most common question: are xylitol and maltitol the same? No. They share a category (polyols/sugar alcohols) and both are used as sugar substitutes, but they’re chemically distinct compounds with different profiles across almost every relevant measure.
What They Actually Are
Xylitol is a five-carbon sugar alcohol that occurs naturally in small quantities in fruits, vegetables and birch trees. It’s produced commercially from the wood of birch trees or agricultural waste products such as corn cobs. The five-carbon structure is important because this is what confers some of xylitol’s properties, such as being difficult for certain types of oral bacteria to break down.
Maltitol is a sugar alcohol formed from a disaccharide (12-carbon sugar), maltose, which is derived from starch sources (usually corn, wheat or potato starch). It’s produced via hydrogenation of maltose. Maltitol is a disaccharide (twelve carbon) sugar alcohol, and as such has very different properties to xylitol in terms of absorption, effect on blood glucose and energy content.
Both are found naturally in small quantities in some foods, both are commercially produced in high volumes, and both are considered GRAS by the FDA, and are approved as food additives in the EU.
Maltitol vs Xylitol: The Core Comparison
| Feature | Xylitol | Maltitol |
| Chemical structure | 5-carbon sugar alcohol | 12-carbon disaccharide sugar alcohol |
| Source | Birch wood, corn cobs | Corn, wheat, potato starch (via maltose) |
| Sweetness vs sugar | ~100% (equally sweet) | ~75-90% as sweet as sugar |
| Calories per gram | 2.4 kcal/g | 2.0 to 3.0 kcal/g |
| Glycemic index | 7 to 13 (very low) | 35 to 52 (moderate, varies by form) |
| Blood sugar impact | Minimal | Moderate, especially maltitol syrup |
| Dental benefits | Strong, actively inhibits cavity bacteria | Present but weaker |
| Gut fermentation | Yes, prebiotic effects documented | Yes, fermented by gut bacteria |
| GI side effects | Yes, especially at higher doses | Yes, typically milder per gram |
| Toxic to dogs | Yes, highly toxic | Not to the same degree |
| Emerging cardiovascular concern | Yes (2024 Cleveland Clinic research) | Not raised for maltitol specifically |
| Common applications | Gum, mints, dental products, toothpaste | Sugar-free chocolate, baked goods, confectionery |
Glycemic Index: Where the Difference Really Matters
This is the most practically significant difference between the two, especially for diabetics, people on keto, or anyone managing blood sugar.
Xylitol’s GI of 7 to 13 means it causes almost no meaningful rise in blood glucose. This is one of the reasons it’s so popular in diabetic-friendly and keto products. The body metabolizes xylitol independently of insulin, so it doesn’t trigger the same hormonal response that sucrose does.
Maltitol’s GI is more complicated. Powdered maltitol has a GI of around 35, which is meaningfully lower than table sugar at 60 to 65. But maltitol syrup, which is the form used in many cheaper sugar-free products, has a GI closer to 52, almost as high as regular sugar. If you’re buying sugar-free chocolate or keto snacks and checking whether maltitol is in powder or syrup form on the label, that distinction matters a lot.
The practical implication:
- For blood sugar management, xylitol is significantly better than maltitol
- Maltitol, especially in syrup form, can cause blood sugar spikes that undermine the “sugar-free” or “diabetic-friendly” labeling
- Products labeled keto-friendly with maltitol as the primary sweetener are often misleading because maltitol’s glycemic impact can kick people out of ketosis
Dental Health: Xylitol Has a Real Edge
Both xylitol and maltitol are non-cariogenic, meaning they don’t feed the bacteria that cause tooth decay the way regular sugar does. But xylitol goes further.
What xylitol can do that maltitol can’t
- Directly inhibits Streptococcus mutans, the main bacteria that caries
- Due to the five-carbon structure, S. mutans tries to digest xylitol, but is unable to finish, which puts a halt to energy production and limits bacterial reproduction
- Increases saliva flow, which has a buffering effect
- May help remineralise teeth when used regularly
This 2025 retrospective paper comparing xylitol and maltitol chewing gums in 100 Chinese children (aged 7-14 years) found both gums were effective in reducing plaque and increasing salivary pH, compared to the control, although less so with the maltitol gum. They had no statistically different effect on acid neutralization in the mouth (pH), which suggests both chewing gums are helpful with acid neutralization due to the chewing itself, but the anti-bacterial mechanism of xylitol provides a better direct cariostatic effect.
A previous controlled trial of 258 Chinese adolescents over 30 days showed both chewing gums of maltitol and xylitol reduced plaque pH and four cariogenic species of bacteria to the same extent. Some of the mechanical effect was due to the gum base, but both polyols had significant additional effects.
Dentists verdict:
- Both better than sugars for teeth
- Xylitol has a proven active role in fighting bacteria, which maltitol doesn’t
- This is why xylitol is the sugar alcohol of choice in dental guidelines, toothpastes and by dentists
Digestion: they are both bad, in different ways
Sugar alcohols are not completely digested in the small intestine. They are fermented by gut bacteria in the large intestine to form gas and at higher intakes this can cause bloating, abdominal pain, and diarrhoea.
For xylitol:
- Intolerance varies between individuals
- Typical dose causing GI symptoms is 30-40g per day in adults, but can be lower in sensitive individuals
- Fermentable to short chain fatty acids such as butyrate and propionate, which are used by colon cells and promote immunity
- Prebiotic activity is good, more butyrate formation than other prebiotics in some studies
For maltitol:
- Has a slightly higher per-gram tolerance than xylitol before causing GI symptoms
- Also fermented in the large bowel but with a different fermentation pattern
- Research indicates prebiotic benefits such as modification of gut microbiota
- The 2025 Cardiovascular Research review mentioned both xylitol and maltitol have positive effects on gut microbiota composition in human intervention studies
Practical guidance:
- Introduce either gradually into your diet
- Most adults can consume 10-15 grams per day without adverse effects
- Avoid large quantities of foods sweetened with either in one go
The Heart Problem With Xylitol
This is new, significant, and it shifted the focus on xylitol.
The new study by researchers from the Cleveland Clinic was published in the European Heart Journal in June 2024. These researchers previously found that erythritol was associated with risk of heart disease. Their findings:
- For two populations combined (more than 2,000 individuals), people with highest blood xylitol had 50% greater risk of cardiovascular events (heart attack, stroke, death) over 3 years compared to the lowest blood xylitol
- In lab experiments with human blood, physiological concentrations of xylitol increased platelet sensitivity and clotting
- When 10 healthy adults drank a 30g beverage of xylitol, the level in their blood increased 1,000-fold within 30 minutes and their platelets were more reactive to clotting signals
This sounds alarming. But there is controversy about how to interpret it:
- The study detected an association but not causation. It is possible that in people with high blood xylitol, xylitol is produced endogenously in some metabolic states, and high blood xylitol levels might be a symptom of disease
- Another review in Cardiovascular Research (August 2025) found Mendelian randomization studies do not associate sugar alcohols with cardiovascular risks and a 5-week intervention study in obese patients found no impact on vascular function from xylitol
- The platelet study had only 10 subjects, no placebo and single time point
- Some argue that the study title should have been “high risk patients have increased endogenous xylitol production”
Current practical stance:
- High-risk patients (known heart disease, blood clotting disorders, taking blood thinning drugs) should be wary of high intake of xylitol until further research adds to the clarity
- Low-moderate use in high volume dental products (toothpaste, chewing gum) is negligible in terms of quantity used
- Continuous use of high amounts in foods, keto ice, sugar-free cakes and cookies is worth considering if at risk of cardiovascular issues
- There is no such concern with maltitol
Xylitol and Dogs: A Hard Safety Rule
That has to be part of all discussions about xylitol. Xylitol is very toxic to dogs.
In dogs, xylitol causes a dramatic release of insulin leading to hypoglycemia. A dose of 0.1g per kg bodyweight or greater will put the animal at risk for hypoglycemia, while higher doses of 0.5g per kg body weight or greater may lead to liver damage. These are relatively small amounts (one piece of xylitol gum can contain 0.3-1g of xylitol).
- Keep all products containing xylitol out of reach
- This includes gum, mints, toothpaste, peanut butter and anything else containing xylitol
- Maltitol is not as toxic to dogs
If you think your dog has ingested xylitol, seek veterinary care.
Where You’ll Find Each One and Why
Xylitol is commonly used in:
- Chewing gum (by far the most common use)
- Toothpaste and mouthwash (to promote oral health)
- Mints and hard candies
- Some dental supplements and nasal sprays
- Certain diabetes-friendly products
Maltitol can be found in:
- Sugar-free chocolate (it most closely resembles the texture and feel of chocolate)
- Sugar-free confectionery and baking products
- Some protein bars and energy bars
- Gelatin capsules in medicines as a capsule filler
- Various “keto-friendly” snack foods
The reason why maltitol is used in most sugar-free chocolate is because it has a similar melting point and setting temperature as sucrose, it doesn’t have a cooling effect like xylitol or erythritol, and because it gives a texture close enough to the original chocolate to appeal to most people. There are no other sugar alcohols commonly used that work better for chocolate.
Which Should You Choose
Neither is always the best. It depends on your priorities.
Choose xylitol if:
- You’re looking to support dental health with a sugar alcohol
- You’re on a restricted blood sugar diet and want the least blood sugar effect
- You follow ketogenic diet and sugars are a concern
- You’re aware of the cardiovascular research and are tracking that
Choose maltitol if:
- You’re baking (or purchasing) a sugar-free chocolate recipe and want it to taste good
- You’re looking for a sweetener that acts more like sugar when baking
- You have a heart disease risk factor and don’t want to use xylitol following the 2024 study
- You are sensitive to the GI effects of xylitol
Avoid or limit both if:
- You have IBS or are very sensitive to bowel issues
- You’re consuming large amounts of processed sugar-free foods containing either
- You have dogs (don’t give xylitol to your dogs)
- You’re a diabetic and need to choose, xylitol is better and avoid maltitol syrup
