He added: "The challenge with some other prebiotic fibers such as inulin [chicory root fiber] is that you need 5g to get a prebiotic effect, but if you take 7g you may get a stomachache [although suppliers have so there’s a narrow therapeutic window, whereas we have a really wide one.” On a more practical level, Arrabina’s low viscosity means it will not gel or impact texture when added as a supplement to protein powders or as a fiber boost for nutrition bars, baked goods, and drinks, he said. What are prebiotics? The definition of 'prebiotic' agreed by the International Scientific Association for Probiotics and Prebiotics (ISAPP) in 2017 is: “