Arrowroot powder is a versatile, grain-free starch used primarily as a cooking thickener, but it also offers digestive benefits, works well in natural skincare products, and fits into most restricted diets. Extracted from the root of the tropical Maranta arundinacea plant, it’s one of the most neutral-tasting starches available, which explains why it shows up in everything from glossy fruit sauces to homemade deodorants.
A Neutral, Gluten-Free Thickener
The most common use for arrowroot powder is thickening sauces, gravies, soups, and pie fillings. It produces a clear, glossy finish rather than the cloudy, matte look you get from flour or cornstarch. That makes it especially useful in fruit sauces, glazes, and any dish where appearance matters.
Arrowroot also holds up well in acidic recipes. It stays stable when combined with citrus juice, vinegar, or tomatoes, whereas cornstarch can break down and thin out in acidic conditions. It also tolerates freezing without becoming spongy or weeping liquid when thawed, so it’s a strong choice for make-ahead pie fillings and frozen desserts.
If you’re substituting arrowroot for other thickeners, the ratios differ from what you might expect. Use about 4½ teaspoons of arrowroot for every 1 tablespoon of cornstarch, or 2½ teaspoons of arrowroot for every 1 tablespoon of wheat flour. The powder thickens at a lower temperature than most starches, gelling between about 150°F and 170°F, which means it works quickly in simmering liquids.
How to Use It Without Clumping
Arrowroot powder needs to be mixed into a slurry before it goes into a hot dish. Combine it with a few tablespoons of cool water or broth, stir until smooth, then pour the slurry into your simmering liquid. Dumping the dry powder straight into a hot pot will create lumps that are difficult to dissolve.
Timing matters too. Add the slurry at the very end of cooking, ideally when your liquid is simmering around 185°F to 206°F. Prolonged exposure to high heat breaks down arrowroot’s thickening ability, so a sauce that was perfectly thickened can turn thin again if it boils for too long. Stir it in, let the sauce thicken for a minute or two, then pull it off the heat.
Digestive Benefits
Arrowroot has a long folk history as a remedy for upset stomachs, and there is some clinical backing for this. A pilot study published in Arquivos de Gastroenterologia tested arrowroot in patients with irritable bowel syndrome and found it reduced diarrhea frequency, eased abdominal pain, and even had a longer-term benefit on constipation. The researchers attributed the effect to increased fecal bulk, which helps the bowel move more efficiently.
Part of the explanation lies in arrowroot’s fiber content. The powder contains roughly 8.7% insoluble dietary fiber and 5% soluble dietary fiber by weight. It also contains resistant starch, a type of starch your body can’t fully digest. Resistant starch behaves like soluble fiber in your gut: it forms a gel-like substance that slows digestion and feeds beneficial bacteria in the colon. When gut bacteria ferment these fibers, they produce short-chain fatty acids, particularly butyrate, which nourishes the cells lining the intestine and supports overall gut health. Animal research has shown that arrowroot-fed groups tend to produce higher amounts of butyrate compared to controls, suggesting a meaningful prebiotic effect.
Appetite and Fullness
Because arrowroot contains resistant starch and soluble fiber, it slows the rate at which food moves through your digestive system. That prolonged digestion creates a more sustained feeling of fullness after eating. Foods rich in resistant starch have been linked to better appetite regulation, which can support weight management over time. Arrowroot’s modest protein content may contribute to satiety as well, though the starch itself is not high in protein. The effect depends on how much you consume regularly, so occasional use in a sauce or gravy is unlikely to have a dramatic impact on appetite.
Dietary Compatibility
Arrowroot is naturally gluten-free, grain-free, and paleo-friendly, which makes it one of the go-to thickeners for people avoiding wheat, corn, or other common allergens. It’s also vegan and has an extremely mild, almost nonexistent flavor, so it won’t alter the taste of a dish the way flour can. For people following low-FODMAP or elimination diets, arrowroot is generally well tolerated, though individual responses vary.
Nutritionally, arrowroot powder is mostly starch. A cup of the flour contains very small amounts of minerals like potassium (about 14 mg), phosphorus (about 6 mg), and folate (about 9 mcg). You’re not going to rely on it as a meaningful source of vitamins or minerals. Its value is functional: it does the job of thickening without introducing gluten, strong flavors, or common allergens.
Skincare and Body Products
Arrowroot powder absorbs moisture effectively without irritating sensitive skin, which is why it’s a staple ingredient in natural deodorants, dry shampoos, and body powders. In deodorant formulations, it absorbs excess sweat and oil to keep underarms dry while giving the product a silky, smooth texture that glides on easily. Unlike baking soda, which can cause redness or irritation for some people, arrowroot is gentle enough for most skin types.
In DIY dry shampoo, arrowroot works by soaking up oil at the roots, and because it’s white and fine-textured, it blends in more easily on lighter hair than some alternatives (though it can leave a white cast on very dark hair if you use too much). It also shows up in homemade face powders and baby powders as a talc-free alternative.
One Interaction Worth Knowing
Arrowroot is broadly safe for most people, but there’s one specific interaction to be aware of. If you’re taking a polyethylene glycol-based bowel preparation (the type used before colonoscopies or for chronic constipation), you should not combine it with starch-based thickeners including arrowroot. The starch interferes with how the medication works. Outside of that narrow situation, arrowroot has no widely documented drug interactions or contraindications.