pergunta:Cure-All? Melatonin s benefits are debatable, but studies point to many possible uses. The drug may help: - Ease insomnia - Combat jet lag - Prevent pregnancy (in large doses) - Project cells from free-radical damage - Boost the immune system - Prevent cancer - Extend life (From NEWSWEEK, Aug. 14, 1995: 42)
ANSWER THIS QUESTION IN ENGLISH.
Mention two indicators in the text which show that there are doubts about the benefits of melatonin.