Healthy Benefits of Arrow root flour ; 👉 It's used as a thickening agent and gluten-free flour. 👉 Many of its health benefits are associated with its starch content, which may promote weight loss, treat diarrhea, and stimulate your immune system. 👉 In addition to its culinary and medicinal uses, arrowroot is used for cosmetic purposes 👉 Arrowroot is a starchy vegetable with a significant amount of protein and several minerals. It provides over 100% of the DV for folate.