The last I read they thought it was from some wheat gluten used as a filler and source of protein.

Nancy, you might try Drs. Foster and Smith. I don't know if the NACL can be sold by mail-order or not, but they are a very good company to buy from.

Do you have ranch supply places where you are which carry med. supplies for ranch animals? They might have a better price if the law allows it. I know it varies from state to state.

Best thoughts coming your way,

kat