“Next, the same experiment could be done with individuals who would be more likely to use melatonin supplements, or even just a broader group than "healthy young adults". I feel that the starting point of the experiment is a bit flawed since there's a high chance these healthy young adults don't have the problem the supplements are designed for.”

Hacker News · Aug 9, 2:06 AM · Study finds melatonin impairs morning cognition in healthy young adults