Tapioca starch is extracted from the roots of the South American cassava plant. 
it is a common replacement for Arrowroot (Maranta arundinacea) and in fact, most commercially available 'Arrowroot' is actually Tapioca Starch.

Tapioca starch can be used as a natural thickener in personal care products. It is particularly useful in natural deodorants as well where it aids in removing excess moisture.

Used in Natural Manuka Deodorant