Over the past 150 years, we (humans, that is) have been quite creative with the food additives we’ve used to make food do what we want.

I doubt there’s a known number of food additives, but I’d estimate it’s more than 1,000.

Many of them are entirely artificial, or synthetic, meaning they’re made from a combination of natural ingredients but don’t resemble anything found in the natural world.

Some are natural and look like what you’d find in a plant.

One natural ingredient we use a lot in “natural” foods is Xanthan gum.

I know most people don’t think much about the ingredients that make packaged foods thicker, smoother, or creamier.

But xanthan gum is one of those ingredients that shows up everywhere.

It’s kinda wild where it pops up.

Today I’m not just going to talk about how it’s used…but more importantly, how consuming it may lead to harm when it’s not supposed to.

What Exactly Is Xanthan Gum?

Xanthan gum is everywhere in natural health foods (and even in non-natural foods).

It’s  used in salad dressings, sauces, soups, gluten-free breads, protein powders, non-dairy products, frozen foods, and plenty of products marketed as “healthy.” It works well because even a small amount can change texture and keep ingredients from separating.
Xanthan gum is a complex carbohydrate produced through bacterial fermentation. Manufacturers typically ferment sugars using Xanthomonas campestris, then isolate and process the resulting polysaccharide into the powder used in foods.

So while it’s natural, it’s not the purest ingredient

Even our own digestive enzymes don’t break it down particularly well.

For years, xanthan gum has generally been considered safe at the amounts used in food.

That hasn’t suddenly changed.

What has changed is that researchers are looking more closely at what xanthan gum actually does once it reaches the gut, and how our intestinal bacteria respond to it.

Because our bodies won’t break it down, researchers assumed xanthan gum mostly passed through the digestive tract as a relatively inert thickener.

We now know that isn’t quite true.

A 2022 study in Nature Microbiology found that certain bacteria in the human gut can metabolize xanthan gum. Researchers identified a specific group of gut microbes that can begin the breakdown process, with other bacteria then feeding on the resulting carbohydrate fragments.

In other words, xanthan gum isn’t necessarily just passing through.

It can become food for the microbiome.

That doesn’t automatically make xanthan gum harmful. Gut bacteria ferment plenty of healthy fibers too.

But repeated exposure can influence the intestinal ecosystem, which is why I think the newer research deserves attention.

That being said, some newer research is looking more closely at the potential issues it could present.

In this 2026 study, researchers fed xanthan gum to adult rats for 10 weeks and then examined the animals’ colons, inflammatory signaling, intestinal-barrier proteins, and microbiota.

The rats receiving higher doses developed greater inflammatory changes in the colon. Researchers also found alterations in some proteins involved in the intestinal barrier and changes in certain bacterial populations.

While this was an animal study, and not a human clinical trial, we cannot conclude from it that ordinary xanthan gum consumption causes intestinal inflammation or damages the gut barrier in people.

The study does, however, give researchers a reason to ask that question more carefully.

What’s crazy is that despite how prevalent xanthan gum is, human research on it is limited, and some of it goes back several decades.

One small study gave 18 healthy adults 15 grams of xanthan gum per day for 10 days. That’s a fairly large amount compared with typical food exposure.

Researchers found increased stool output, more frequent bowel movements, and significantly more flatulence. They also found evidence that gut bacteria adapted to xanthan gum and became increasingly able to ferment it.

That fits with what we know about many fermentable carbohydrates.

For some people, fermentation is barely noticeable.

For others…especially people already prone to bloating, gas, or loose stools, it can become uncomfortable.

That isn’t the same thing as saying xanthan gum is toxic.

Sometimes the issue is simply tolerance.

So Is Xanthan Gum Safe?

The European Food Safety Authority reevaluated xanthan gum and concluded that there was no safety concern for the general population at estimated dietary exposures.  This is a good sign, as Europe tends to be much stricter on dangerous food additives.

Regulators also did not consider it necessary to establish a numerical acceptable daily intake.

At higher intakes, however, gastrointestinal effects such as abdominal discomfort and increased stool output can occur.

A food ingredient can be considered safe from a toxicology standpoint and still bother somebody’s digestive system.

Beans are safe too.

So is milk.

That doesn’t mean everybody digests them comfortably.

If someone feels well and occasionally eats foods containing xanthan gum, I don’t see convincing evidence that they need to avoid it.

I pay more attention when someone has persistent bloating, gas, diarrhea, or unpredictable bowel habits.

Exposure can also be higher than people realize.

Someone who eats gluten-free breads, wraps, baked goods, protein bars, powders, and packaged sauces throughout the day will likely encounter several servings of gums without noticing.

Gluten-free products filled with xanthan gum often replace some of the structure normally provided by gluten…so you do need to check labels if you’re concerned about xanthan gum levels.

For someone with digestive symptoms, a short elimination experiment can be a reasonable way to see how it affects the gut.

Try reducing foods containing xanthan gum for a couple of weeks while keeping the rest of your diet fairly consistent. See what happens.

If symptoms improve and then return when you bring those foods back in, that’s useful information.

If nothing changes, xanthan gum probably wasn’t the main problem.

I’d much rather do that than assume one ingredient causes every symptom.

Of course, I would argue that eating more whole foods and less processed (even foods that are “natural) is going to help you attain your health goals. Meaning, more meat, vegetables, fruit, legumes, nuts, seeds, minimally processed grains, and fermented foods can provide a much broader range of fibers and plant compounds for the gut microbiome.

You don’t need expensive “gut health” foods to do this.

Bottom Line?

I may have sensationalized the subject of this article, as I don’t think xanthan gum is a scourge. True, we know xanthan gum interacts with the human gut microbiome.

And we know high intakes can increase gas and bowel movements. New animal research also suggests chronic exposure may affect inflammation and the intestinal barrier.

What we don’t have is good human evidence showing that normal food exposure causes chronic intestinal inflammation.

So I wouldn’t be afraid of xanthan gum.

But you should be aware of it.

Read labels. Pay attention to how much packaged food you’re eating. If your digestive system seems sensitive, experiment thoughtfully rather than guessing.

And whenever possible, build more of the diet around foods that don’t need gums and stabilizers to hold themselves together.

That’s usually a much better place to start.