Tapioca Starch (Best Option)
1:1 (1 tablespoon tapioca starch per 1 tablespoon arrowroot powder)Tapioca starch is a fine, neutral-tasting starch that thickens liquids effectively at low temperatures, making it ideal for cold applications like smoothies. It creates a smooth, slightly glossy texture without adding any off-flavors.
To avoid clumping, blend tapioca starch thoroughly with other dry ingredients before adding liquids, or dissolve it in a small amount of cold liquid first. Because it thickens quickly, add it gradually and adjust to desired consistency.
Compared to arrowroot, tapioca starch provides a very similar mouthfeel and clarity, though it may be slightly less glossy. It is an excellent vegan, gluten-free, and allergen-friendly option.