And these are the herbs with which one fulfills his obligation on Pesach: with lettuce, endives, horseradish, charchavinah, and maror. One fulfills his obligation with them whether moist or dry, but not preserved, nor stewed, nor boiled; they combine to the size of an olive; [and] one can fulfill his obligation with their stalk; with demai; [and] with first tithe whose terumah has been separated, and with consecrated property and second tithe that were redeemed.

We may not soak bran for chickens, but we may scald it.  A woman may not soak bran to take with her to the baths, but she may rub it on her skin dry.  A man may not chew wheat and place it on his wound on Pesach, because it becomes chametz.