Leavening

• Yeast
• Sourdough starter
• Baking powder (sodium aluminum phosphate, sulfate)
• Baking soda (sodium bicarbonate, bicarbonate of soda)
• Cream of tartar (potassium bitartrate)
• Potassium carbonate (pearlash)
• Potash (potassium bicarbonate)
• Ammonium bicarbonate (a.k.a. hartshorn, horn salt, bakers ammonia)
• Ammonium phosphate
• Calcium phosphate
• Monocalcium phosphate
• Sodium aluminum phosphate (SALP)
• Sodium acid pyrophosphate (SAPP)
• Cal-Rise phosphate
  

Not leaven

• Egg whites
• Torula Yeast
• Cornstarch
• Yeast extract – a derivative of yeast that cannot leaven anything.
• Brewers yeast – a byproduct brewing beer that has no fermenting power. It is used as a food supplement, or a flavor enhancer.
• Autolyzed yeast – a flavor enhancer and cannot be used for making bread.