Overview
About Arrowroot flour
Arrowroot is one of the very few pantry staples that comes back clean on every single trigger column: A for gluten, all four FODMAP groups, histamine and histamine liberation, salicylate, oxalate, nickel, sulfite, nitrite, glutamate, lactose, dairy protein and nightshade, with nothing borderline anywhere.
It is a starch extracted from the rhizome of Maranta arundinacea, a tropical tuber rather than a grain, which is why it clears paleo and AIP protocols where cornstarch does not. As a thickener it behaves differently from cornstarch in ways worth knowing: it sets at a lower temperature, finishes glossy and transparent instead of cloudy, and freezes and thaws without weeping, but it thins out if you boil it hard and turns unpleasantly slippery in dairy sauces.
Sensitivities
How Arrowroot flour scores
Watch for
What trips people up
- Nothing is flagged. Every graded criterion comes back A, including the ones that catch most flours, so if a sauce thickened with arrowroot caused symptoms the trigger is far more likely to be the stock, the cream or the aromatics
- Buy on the label if you are coeliac. The tuber has no gluten, but arrowroot is milled and packed alongside wheat in some facilities, and cheap tins are sometimes cut with tapioca or potato starch without a clear declaration
- It cannot take a long boil. Add it as a slurry at the end and pull the pan off a rolling boil, because sustained heat breaks the gel and the sauce goes watery again on the plate
- It does not get on with dairy. In milk or cream sauces arrowroot turns slimy and stringy, which is a technique mismatch rather than a reaction to the ingredient
- It is nearly pure starch, so it contributes texture and effectively no fibre, protein or micronutrients. Treat it as a tool, not a nutrition addition
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Arrowroot flour
Is arrowroot flour low FODMAP?
Yes. Arrowroot is rated low FODMAP overall and clean on each group individually: fructans A, galacto-oligosaccharides A, excess fructose A and polyols A. It is refined starch with the fibre and sugars stripped out, so there is very little left for gut bacteria to ferment. That makes it one of the safest thickeners to keep on hand during an elimination phase, and it is also graded A for low-fermentation and SIBO plans.
Is arrowroot gluten free?
Yes, and not marginally so. It comes from a tuber, not a cereal grain, so there is no gluten protein in the plant to begin with and it grades A for gluten sensitivity. The only realistic exposure is cross-contact in a mill or packing line that also handles wheat, so if you have coeliac disease choose a product that carries a gluten-free certification rather than relying on the ingredient alone.
Is arrowroot better than cornstarch if you have food sensitivities?
On the chemical triggers the two are close, because both are refined starches with the protein and fibre removed, and corn based starches also come back clean on gluten, histamine and the FODMAP groups in our data. The real differences sit elsewhere. Arrowroot comes from a tuber, so it clears paleo and AIP protocols that exclude corn as a grain, and it is graded A for low-fermentation and SIBO plans where corn flour sits at C. If you are avoiding corn specifically, or eating grain free, arrowroot is the meaningful upgrade. If you are not, either will thicken your sauce.
Can I substitute arrowroot for cornstarch one for one?
Close to it by volume, though arrowroot sets a little more firmly so many cooks pull back slightly. The bigger adjustment is timing and temperature. Arrowroot starts thickening around the point cornstarch is still waking up, so stir the slurry in near the end of cooking, let it come just to a simmer, and take the pan off the heat. Hold it at a hard boil and it will break down and thin out.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.