When shopping for melatonin, you may notice two grades of melatonin: natural and synthetic (also called pharmacy grade). What´s the difference? Natural grade melatonin comes from animals (you don´t want to know how) and it may be impure and imprecisely measured. You may not be getting exactly what the bottle says. On the other hand, synthetic grade melatonin is produced in a laboratory environment under strict controls so that it´s much more pure and precisely measured than natural grade melatonin.

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