Also, I don't take melatonin often, only when I seem to need to reset my sleep cycle, and I only take about 200-300 micrograms.
Why do you take so much? 5mg is a lot, according to the studies.
I started with 5mg arbitrarily because that seemed to be the most common dosage sold at the time. I think about lowering the dosage sometimes but at the end of the day, I know 5mg works well for me. I don't notice any side effects, and it's not any cheaper.
I also started with the special "slow release" formulas but couldn't tell any difference from the normal generic stuff.