Also known as guaran, guar gum is made from legumes called guar beans (1).

It's a type of polysaccharide, or long chain of bonded carbohydrate molecules, and composed of two sugars called mannose and galactose (1).

Guar gum is frequently used as a food additive in many processed foods (1).

It's especially useful in food manufacturing because it's soluble and able to absorb water, forming a gel that can thicken and bind products (1).

The Food and Drug Administration (FDA) considers it to be generally recognized as safe for consumption in specified amounts in various food products (2).

The exact nutrient composition of guar gum differs between producers. Guar gum is generally low in calories and mainly composed of soluble fiber. Its protein content may range from 5–6% (3).

Summary Guar gum is a food additive that is used to thicken and bind food products. It's high in soluble fiber and low in calories.

Guar gum is widely used throughout the food industry.

The following foods often contain it (2):

  • ice cream
  • yogurt
  • salad dressing
  • gluten-free baked goods
  • gravies
  • sauces
  • kefir
  • breakfast cereals
  • vegetable juices
  • pudding
  • soup
  • cheese

In addition to these food products, guar gum is found in cosmetics, medications, textiles, and paper products (1).

Summary Guar gum is found in dairy products, condiments, and baked goods. It's also used as an additive in non-food products.

Guar gum is well known for its ability to thicken and stabilize food products, but it may also provide some health benefits.

Studies indicate that it could be beneficial for a few specific areas of health, including digestion, blood sugar and cholesterol levels, and weight maintenance.

Digestive health

Because guar gum is high in fiber, it may support the health of your digestive system.

One study found that it helped relieve constipation by speeding movement through the intestinal tract. Partially hydrolyzed guar gum consumption was also associated with improvements in stool texture and bowel movement frequency (4).

Additionally, it may act as a prebiotic by promoting the growth of good bacteria and reducing the growth of harmful bacteria in the gut (5).

Thanks to its potential ability to promote digestive health, it may also help treat irritable bowel syndrome (IBS).

One 6-week study following 68 people with IBS found that partially hydrolyzed guar gum improved IBS symptoms. Plus, in some individuals, it reduced bloating while increasing stool frequency (6).

Blood sugar

Studies show that guar gum may lower blood sugar.

This is because it’s a type of soluble fiber, which can slow the absorption of sugar and lead to a reduction in blood sugar levels (7).

In one study, people with diabetes were given guar gum 4 times per day for 6 weeks. It found that guar gum led to a significant decrease in blood sugar and a 20% drop in LDL (bad) cholesterol (8).

Another study observed similar findings, showing that consuming guar gum significantly improved blood sugar control in 11 people with type 2 diabetes (9).

Blood cholesterol

Soluble fibers such as guar gum have been shown to have cholesterol-lowering effects.

Fiber binds to bile acids in your body, causing them to be excreted and reducing the number of bile acids in circulation. This forces the liver to use cholesterol to produce more bile acids, leading to a decrease in cholesterol levels (10).

One study had 19 people with obesity and diabetes take a daily supplement containing 15 grams of guar gum. They found that it led to lower levels of total blood cholesterol, as well as lower LDL cholesterol, compared to a placebo (11).

An animal study found similar results, showing that rats fed guar gum had reduced blood cholesterol levels, in addition to increased levels of HDL (good) cholesterol (12).

Weight maintenance

Some studies have found that guar gum could aid weight loss and appetite control.

In general, fiber moves through the body undigested and may help promote satiety while reducing appetite (13).

In fact, one study showed that eating an additional 14 grams of fiber per day may lead to a 10% decrease in calories consumed (14).

Guar gum may be particularly effective at reducing appetite and calorie intake.

One review of three studies concluded that guar gum improved satiety and reduced the number of calories consumed from snacking throughout the day (15).

Another study looked at the effects of guar gum on weight loss in women. They found that consuming 15 grams of guar gum per day helped women lose 5.5 pounds (2.5 kg) more than those who took a placebo (16).

Summary Studies suggest that guar gum could improve digestive health and decrease blood sugar, blood cholesterol, appetite, and calorie intake.

Consuming large amounts of guar gum could have negative health effects.

In the 1990s, a weight loss drug called "Cal-Ban 3,000" hit the market.

It contained a large amount of guar gum, which would swell up to 10–20 times its size in the stomach to promote fullness and weight loss (17).

Unfortunately, it caused serious problems, including obstruction of the esophagus and small bowel and, in some cases, even death. These dangerous side effects ultimately led the FDA to ban the use of guar gum in weight loss products (17).

However, keep in mind that these side effects were caused by doses of guar gum that are considerably higher than the amount found in most food products.

The FDA has specific maximum usage levels for different types of food products, ranging from 0.35% in baked goods to 2% in processed vegetable juices (2).

For example, coconut milk has a maximum guar gum usage level of 1%. This means that a 1-cup (240-gram) serving can contain a maximum of 2.4 grams of guar gum (2).

Some studies have found no significant side effects with doses up to 15 grams (18).

However, when side effects occur, they typically include mild digestive symptoms like gas, diarrhea, bloating, and cramps (19).

Summary High amounts of guar gum can cause problems like intestinal obstruction and death. The amounts in processed foods do not usually cause side effects but can sometimes lead to mild digestive symptoms.

While guar gum may be generally safe in moderation for most, some people should limit their intake.

Though the occurrence is rare, this additive may trigger an allergic reaction in some people (20, 21).

Furthermore, it can cause digestive symptoms, including gas and bloating (22).

If you find that you're sensitive to guar gum and experience side effects following consumption, it may be best to limit your intake.

Summary Those with a soy allergy or sensitivity to guar gum should monitor or limit their intake.

In large amounts, guar gum may be harmful and can cause negative side effects.

However, the amount found in processed foods is likely not a problem.

Though fiber like guar gum may have some health benefits, basing your diet on whole, unprocessed foods is the best way to achieve optimal health.