Caffeine and fermentation
When a product ferments, is caffeine removed?
Mecklenburg County North Carolina
NC State University has done very little research in this area. I have linked two sites below which discuss caffeine in tea. Both seem to indicate that fermentation increases the caffeine content.
This research paper found that change in caffeine level depended on the type of fermentation. (Molds fermentation increased the caffeine content, but yeasts fermentation decreased the caffeine content.)