[Varian frowns, his expression tight. He'll set the bottle out on his podium for Peregrine to look over, if she thinks she might be able to discern anything.]

I don't know much about melatonin, but if it's supposed to make you sleep...I imagine it's not a drug that could kill you, per-say.

[Anything could kill you, with the right dosage. But...]

It sounds like you'd have to use up most of this bottle for that. Otherwise...you're just going to be sleeping for a really long time.