XYLITOL RESEARCH

Xylitol Safety & Research

Decades of research. New questions. A closer look at what we know about xylitol.

Xylitol has been studied for more than 50 years for its effects on oral health, plaque bacteria, and cavity prevention. More recently, new research has raised questions about circulating xylitol levels and cardiovascular health.

Here, Dr. Ellie brings together the research behind her recommendations, including the evidence supporting xylitol’s oral-health benefits, new questions about safety, and new research as it emerges.

A TIMELINE

Xylitol in Cardiovascular Research

DR. ELLIE'S PERSPECTIVE

Science Should Keep Asking Questions

“I have recommended xylitol for more than four decades because of the oral health research and because I have seen its benefits in practice. I also believe we should pay attention when new scientific questions arise.”

"First, thank you for caring enough about your health to ask these questions. I am aware of the recent research involving xylitol and cardiovascular health, and I understand why the headlines have caused concern.

I have recommended xylitol for more than four decades because of the oral health research and because I have seen its benefits in practice. I also believe we should pay attention when new scientific questions arise. My recommendation has always been very specific: small amounts, used repeatedly throughout the day for oral health, generally 1–2 grams at a time, five times a day, for a total of about 5–10 grams daily. This recommendation is based on decades of research into xylitol, plaque bacteria and tooth decay, as well as what I have observed in practice and in my own family.

The cardiovascular research that began receiving attention in 2024 is important, but we need to be precise about what was studied. Researchers found an association between higher fasting blood xylitol levels and cardiovascular events. They also conducted laboratory and animal experiments and a small human experiment in which 10 people consumed 30 grams of xylitol at once after fasting. That is very different from the small, repeated amounts I recommend for oral health.

Importantly, xylitol is also something the human body produces naturally. In fact, the researchers themselves concluded that the fasting xylitol levels observed in their cardiovascular cohort likely reflected differences in the body's own production of xylitol rather than recent food intake. Blood xylitol is not the same thing as documented xylitol consumption.

Now, in 2026, researchers have reported another association between higher fasting blood xylitol and cardiovascular risk in much larger populations. I take that seriously. It makes understanding why some people have higher fasting xylitol levels an important scientific question. But it still does not tell us that those people were consuming more xylitol, nor does it establish that consuming xylitol caused their cardiovascular events.

At the same time, we should not lose sight of the much larger history of xylitol research. Studies spanning decades have investigated its effects on tooth decay, plaque and oral bacteria, dosage and frequency, children, mothers and their babies, and long-term oral health. More recently, a large randomized study involving more than 10,000 pregnant participants in Malawi found that twice-daily xylitol gum was associated with significantly fewer preterm and low-birthweight deliveries.

This does not mean we should ignore new questions because older research was positive. It means we should look at all of the evidence, understand exactly what each study measured, and resist allowing a headline to tell us more than the research itself does.

I have used xylitol myself for decades, and it is used by my family, including my children and grandchildren. I remain confident in the small, repeated amounts I recommend for oral health. But I will also continue to follow the cardiovascular research carefully. If strong evidence changes what we know about xylitol—or how it should be used—I will change my recommendations accordingly.

That is how science should work. We keep asking questions, we keep learning, and we change when the evidence gives us a reason to change.”

- Ellie Phillips, DDS.