
The amount of testosterone secretion inhibition it would cause would be so minimal it would be much more worth taking melatonin for added sleep/energy that your testosterone levels would actually go up.
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0,5mg/kg in rats its not equivalent to 50 mg on humans but its still a overdose,
I think this can help:
Animal Dosage
the way I see it is that a 0.5mg/kg on a 80kg human its equivalent to 40mg of melatonin so ...
a guy that takes 4mg /day will be taking 0,05mg/kg, a lot less than the study dosage,if it still inhibits test , well that I don't know but its unlikely