| http://www.w3.org/ns/prov#value | - To answer that I think we need to look at just what melatonin is.Like estrogen, progesterone and testosterone, melatonin is a powerful hormone ??? the only one that can be legally obtained without a prescription in the United States.?? ???While melatonin could be considered natural,??? writes sleep expert Dr.Michael J. Breus, ???in most cases it doesn???t come from the earth.
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