over here we have potato starch,must be very similar to the corn one,
have used it even for infants,when they get sore bum or rash,keeps the nether region dry,so it should work for adults too if needed.
The ancient Egyptians used wheat starch, I use it here sometimes in place of corn starch or if glutinous isn't a problem use flour as I do sometimes. If you are paranoid about GMOs don't use corn starch