Here are a few leavens we need to stay away from on Passover.
Ammonium Bicarbonate
Baking Powder
Baking Soda (Sodium Bicarbonate)
Monocalcium Phosphate
Sodium Aluminum Phosphate
Sodium Pyrophosphare
Yeast
If you know of any others, let me know.
http://groups.msn.com/YHWHsRemnant/leavens.msnw