Karl Jung spoke frequently of a "mass psychosis", and J. A. Schmit once said, "... the truth is that a stupidity, even after having passed through a million mouths, does not become less foolish."
Like my heroes, I'm here to make the bold, scientific claim that a cheaper, simpler, safer supplement actually also produces superior results.
Oftentimes people are reluctant to adopt a simple solution. They wish to hit a fly with a hammer. They wish to pay more or use a product with elevated status, treating supplements almost as a "Veblen good", as if they were fancy cars.
Melatonin is an end product in the body, a highly metabolized form of serotonin (5-HT).
Further, users of melatonin (across various dosage levels) consistently report feeling strange in the morning, and not any more well rested or alert.
Dizziness, trace, paradoxically sleepy.
Addendum: 5-HTP
It's too potent, again. It's not found in nature, except small amounts in one obscure bean plant. It's associated (even if weakly) with fibrosis of the heart valves.
Subjectively, it promotes sociability and good mood. It has a more potent effect that L-Tryptophan, and can be experimented with on occasion. But it probably shouldn't be used on a daily basis without doctor's approval.
Most of the supplements I recommend are "boring", they are found already in our diet (just not always in adequate amounts), they are safe and well-tolerated (in 98%+ of people).