I looked up the ingredients to read about drug interactions. There haven't been many studies done on some of these herbs but some have been used for many years. HTH!
schisandra fruit - has been used to treat IBS but information/studies have been contradictory; do not take with acetaminophen
lycium - don't take with Warfarin; caffeine free
gynostemma - don't take if pregnant; caffeine free
kukicha - tea made from twigs from same plant green tea and black tea come from; very low in caffeine so it probably won't be a problem
The rest of the ingredients are pretty common and safe:
licorice
ginger
star anise