Assertion: melatonin | /r/HasProperty | widespread
Facets:
Source sentences:
text: Melatonin is widespread and most extensively studied in vertebrates, mammals, reptiles, amphibians, bony and cartilagenous ﬁshes and birds.
text: Melatonin is an important tool in the treatment of sleep disorders in children, and because it is naturally derived, there is a widespread perception that it is safe.