Limited evidenceGut health

Wheat Dextrin

A cheap, tasteless soluble fiber sold for regularity. It is almost completely fermented in the colon, so it adds little stool bulk — the evidence that it relieves constipation is weak compared with psyllium.

Where to buy

View on iHerb

Ships to 180+ countries · welcome discount for new customers

Referral link — this site may earn a commission on purchases.

What the science says

Laxative effect Limited evidence
An evidence-based review of fiber physiology argues that wheat dextrin is non-viscous and rapidly fermented, and therefore does not produce the water-holding stool bulk that drives the laxative effect of psyllium. No large randomized trial supports it as a laxative.
Satiety and glycemia Limited evidence
A randomized study of resistant dextrin in healthy adults found little effect on satiety and only minor changes in glycemic endpoints.
Mineral absorption Moderate evidence
A controlled study in premenopausal and postmenopausal women showed that chronic wheat dextrin supplementation did not impair calcium or magnesium absorption, which is a reassuring safety finding rather than a benefit.

Dosage & safety

Studied doseProducts typically supply 3–5 g per serving, taken one to three times a day. Trials of dextrin fibers used roughly 10–45 g per day.

SafetyWell tolerated; mild gas at higher doses. Derived from wheat starch — the gluten content is negligible and most products are labelled gluten-free, but people with celiac disease should check the label. Do not expect it to work like psyllium for constipation.

How to take it

TimingTiming does not matter.

With food?Either way; it dissolves clear in any drink.

Worth knowingIt is a fermentable fiber, not a laxative, so psyllium is the better choice for constipation.

Frequently asked questions

Does wheat dextrin work for constipation?

The evidence is limited: wheat dextrin is non-viscous and rapidly fermented, so it adds little stool bulk, and no large randomized trial supports it as a laxative. Psyllium is the better choice for constipation.

Is wheat dextrin gluten-free?

Wheat dextrin is derived from wheat starch, but its gluten content is negligible and most products are labelled gluten-free. If you have celiac disease, check the label.

How much wheat dextrin per day?

Wheat dextrin products typically supply 3–5 g per serving, taken one to three times a day; trials of dextrin fibers used roughly 10–45 g per day.

Does wheat dextrin block mineral absorption?

No. A controlled study in pre- and postmenopausal women found chronic wheat dextrin supplementation did not impair calcium or magnesium absorption, a reassuring finding with moderate evidence.

Scientific references

Understanding the Physics of Functional Fibers in the Gastrointestinal Tract: An Evidence-Based Approach to Resolving Enduring Misconceptions about Insoluble and Soluble Fiber
McRorie JW Jr, McKeown NM — J Acad Nutr Diet, 2017
Impact of dietary supplementation with resistant dextrin (NUTRIOSE(®)) on satiety, glycaemia, and related endpoints, in healthy adults
Hobden MR, Commane DM, Guérin-Deremaux L, Wils D, Thabuis C, Martin-Morales A, Wolfram S, Dìaz A, Collins S, Morais I, Rowland IR, Gibson GR, Kennedy OB — Eur J Nutr, 2021
Chronic dietary fiber supplementation with wheat dextrin does not inhibit calcium and magnesium absorption in premenopausal and postmenopausal women
Armas LA, Rafferty K, Hospattankar A, Abrams SA, Heaney RP — J Int Med Res, 2011

Related in Gut health

Probiotics Moderate evidence
Psyllium Husk (fiber) Strong evidence
L-Glutamine Limited evidence
Oregano Oil Limited evidence
Ginger Moderate evidence
Inulin (Prebiotic Fiber) Moderate evidence