Inulin vs Guar Gum: which is worse?

What is Inulin?

Inulin is a naturally occurring prebiotic dietary fiber (fructan polysaccharide) found in chicory root, Jerusalem artichoke, garlic, onions, and bananas. Commercial inulin is extracted primarily from chicory root. It resists digestion in the small intestine and is fermented by beneficial gut bacteria in the colon, promoting growth of Bifidobacterium and Lactobacillus species.

What is Guar Gum?

Guar gum is a galactomannan polysaccharide extracted from guar beans (Cyamopsis tetragonoloba), grown primarily in India and Pakistan. It is a highly effective thickener — approximately 8 times more powerful than cornstarch — and functions as a dietary fiber. It is used extensively in food, pharmaceutical, and industrial applications.

Documented risks

Inulin: Generally safe and beneficial. At doses above 15–20 g/day, inulin commonly causes bloating, gas, abdominal cramping, and diarrhea due to rapid fermentation in the colon. This is well documented in peer-reviewed research. It is contraindicated for people with fructan intolerance or irritable bowel syndrome following a low-FODMAP diet. At normal food fortification levels (3–8 g/serving), it is tolerated by most adults.

Guar Gum: Generally recognized as safe. At high doses (e.g., dietary supplement doses of 10–20 g/day), guar gum can cause flatulence, bloating, and diarrhea. Historically, concentrated guar gum dietary supplements were associated with esophageal obstruction, prompting the FDA to ban such supplements in 1992. At typical food additive use levels, no significant safety concerns have been identified. EFSA confirmed its safety as a food additive in 2017.