How it  Melatonin is a natural hormone (produced by the pineal gland) that seems to regulate your internal clock.
Melatonin is naturally produced by the pineal gland.
Melatonin is an artificial hormone produced in a lab.
Two goldfish are riding bikes in a giant pile of mashed potatoes.
The rider is outdoors on a motorbike.
Man in hat fishing with a rod.
a boy is watching TV at a YMCA
A man scales a craggy cliff.
Kaiser gave a speech about Journalism.