Possible Clues:

• Unknown enemy dispersing: that can bring a reaction
• Bodily substance acting as a catalyst
• Protein produced by cells that acts as a biochemical catalyst
• Brewing agent
• Dietary catalyst
• A protein acting as a catalyst in biochemical reactions
• Digestive aid
• Food processor from Yemen, unfortunately with unknown content
• Agitation after leading pair’s decamped, note, a catalyst
• RNA polymerase, e.g