Comment by wnevets

> It's strange to me how Melatonin is so uncontrolled in usage, dosage, etc., despite being a hormone.

You can thank Mel Gibson and industry lobbying [1][2].

[1] https://www.pbs.org/wgbh/frontline/documentary/supplements-a...

[2] https://www.youtube.com/watch?v=IV2olDA0w8U