<<Disclaimer: Verify this information before applying it to your situation.>> Arrowroot is an often-used ingregient in a new cookbook I just purchased. The only source for Arrowroot that I have been able to find is manufactured by NOW Foods in Illinois. I just spoke to Nick there who says that their machinery is thoroughly cleaned between runs and so he thinks that their arrowroot is gluten free. However, there are lots of gluten containing grains processed in the same room so there might be contamination in the air. Does anyone know of a totally gluten free source for arrowroot? Is arrowroot something you can buy unprocessed and grind your own? Thanks.