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Q. My cousin has child with a very rare genetic disease which requires her to eat corn starch regularly.
A. The general Ashkenazic custom is to refrain from eating kitnios, but that custom is waived for people who have a significant medical need. A Rabbi would sanction those people to eat kitnios but would caution them to avoid chametz. In that context, we contacted OU regarding the Argo and Kingsford brands of pure corn starch, and they informed us that those products are produced without any chametz additives, and are suitable for use by anyone who may eat kitnios on Pesach. It is worth verifying this information before each Pesach to make sure nothing has changed in the factory.