Produced in almost every living organism, including humans
Derived from the root of a common flowering plant
An extract from the same flower used to brew a well-known, relaxing tea
Found in green tea leaves from around the world
The stuff in turkey that makes you sleepy. Yes, it's real.
Found in a variety of foods, including fish, poultry, & cheese
Derived from the seeds of a West African shrub
Found in the cell walls of tomatoes