Historical clue formulations

• Chemical kick-starters — 2023-11-30
• Digestion aids — 2012-10-01
• Some juices — 2012-01-22
• Causes of breakdowns — 2010-10-29
• They help digest food — 2010-06-07
• Pepsin and rennin, for two — 2004-06-22
• They cause breakdowns — 1999-12-11