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Are there major side effects to using melatonin regularly?

I've had a few friends tell me they are using synthetic melatonin as a sleep aid on a regular basis; weekly some even daily. This board is meant to help track and synthesize long term trials that highlight any side effects of regular melatonin usage.
William Fan, Founder of Project Credo
asked 2/8/2018, updated 6/25/2018