Thanks for writing these up. I'm curious which dimension you're referring to when up say that melatonin sucks at higher doses - health effect or cognitive effect?
Also, for reference, I take about 75 mcg when I want to fall asleep quickly and consider upward of .5mg quite a bit.
The main problem I've had with it is that a too-large dose makes me feel sleepy the next day. (3mg, felt extremely sleepy for 4 hours after getting up, and I'd slept in a bit more than normal, too.) My results are a bit strange, though, because another medication I take interacts with it. 1/4mg (guesstimated by cutting the pills with a knife) is usually enough for me.
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