Arrowroot powder is a fine white starch extracted from the rhizomes of the tropical Maranta arundinacea plant. It works as a neutral-tasting thickener in cooking, a gentle option for sensitive digestion, and a moisture absorber in natural body care products. Its versatility is what makes it a staple in gluten-free kitchens and DIY beauty routines alike.
How It Works as a Thickener
Arrowroot powder’s primary job in the kitchen is thickening sauces, gravies, soups, and pie fillings. When mixed with a cold liquid to form a slurry and then heated, the starch granules swell and absorb water, turning a thin liquid into something with body. This process kicks in at around 75°C (167°F) and completes by about 82°C (180°F), which is slightly lower than cornstarch’s thickening range. That lower temperature makes arrowroot a better fit for delicate sauces that you don’t want to boil aggressively.
The finished result is a clear, glossy sauce rather than an opaque one. This makes arrowroot ideal for fruit glazes, clear soups, and any dish where you want the color of the ingredients to shine through. Cornstarch tends to create a slightly cloudier finish. You can substitute arrowroot for cornstarch at a 1:1 ratio and get comparable thickening power.
One important limitation: arrowroot doesn’t hold up well to prolonged heat or reheating. It can break down and turn thin again if cooked too long, so it’s best added toward the end of cooking. It also doesn’t combine well with dairy, sometimes creating a slimy texture in cream-based sauces. For those dishes, cornstarch or flour remains the better choice.
Baking With Arrowroot
In baking, arrowroot powder serves a different purpose than it does in sauces. It lightens the texture of baked goods, particularly in gluten-free recipes where heavier flours like almond or coconut flour can produce dense results. Adding a tablespoon or two to a flour blend helps create a softer crumb. It also works as a binding agent in recipes that skip eggs, helping hold ingredients together without adding flavor or color.
Arrowroot is almost entirely starch, with about 88 grams of carbohydrate per 100 grams of flour. It contains virtually no protein, fat, or fiber. This makes it excellent for texture but not a significant source of nutrition on its own. A cup of raw arrowroot (before processing into powder) provides about 78 calories, 15% of your daily iron, and 11% of your daily potassium, but the small amounts used in recipes contribute only trace nutrients.
Digestive Benefits
Arrowroot has a long history in traditional medicine as a remedy for digestive upset, and there is some clinical evidence to support this. A pilot study published in Arquivos de Gastroenterologia tested arrowroot in 11 patients with irritable bowel syndrome who experienced diarrhea as a primary symptom. Patients took 10 mL of arrowroot powder three times daily for one month. During treatment, their average daytime bowel movements dropped by nearly 3 per day compared to pre-treatment levels, and they reported significantly less abdominal pain.
What’s notable is that some of the benefit persisted even after patients stopped taking arrowroot. One month after discontinuing treatment, daytime bowel frequency was still reduced by about 1.9 movements per day compared to baseline. The likely explanation involves how the body handles arrowroot’s starch: up to 20% of dietary starch reaches the colon undigested, where gut bacteria ferment it into short-chain fatty acids. This fermentation increases stool bulk and lowers the pH of the colon, which together promote more regular, efficient bowel movements and may reduce cramping.
Because arrowroot is bland, easily digested, and unlikely to irritate the stomach lining, it has traditionally been used in foods for people recovering from illness, young children transitioning to solid foods, and anyone with a sensitive stomach.
Moisture Absorption in Body Care
Outside the kitchen, arrowroot powder is a common ingredient in natural deodorants, dry shampoos, and body powders. Its high starch content gives it strong moisture-absorbing properties. The starch molecules are hydrophilic, meaning they naturally attract and hold water molecules. Applied to the skin, arrowroot pulls sweat away from the surface and keeps it locked in the powder.
In natural deodorants, this serves a dual purpose. By absorbing sweat, arrowroot reduces the moist environment that odor-causing bacteria need to thrive. It doesn’t block sweat glands the way aluminum-based antiperspirants do. Instead, it manages moisture after it reaches the skin’s surface. For people who react to baking soda (a common irritant in DIY deodorant recipes), arrowroot can replace some or all of it to create a gentler product that still controls dampness.
As a dry shampoo, arrowroot works on the same principle: it absorbs excess oil at the roots, adding volume and extending the time between washes. Because the powder is white, it blends more easily into lighter hair colors. Those with darker hair sometimes mix it with cocoa powder to avoid a visible residue.
Dietary Compatibility
Arrowroot is naturally gluten-free, grain-free, and nut-free, which places it in a narrow category of thickeners that work across multiple restricted diets. It fits within Paleo guidelines because it comes from a whole-food plant source rather than a processed grain. It is not suitable for keto diets, however, since it is almost pure carbohydrate with 88 grams per 100 grams of powder.
For people with corn allergies or sensitivities, arrowroot is one of the most reliable substitutes for cornstarch. It performs nearly identically in most applications and carries no risk of corn-derived contamination, provided the brand doesn’t process it alongside corn products. It’s also free of the proteins that trigger reactions in people with wheat or soy allergies, making it one of the safest thickening options for households managing multiple food sensitivities.