This is the 14137th most frequent Korean word.
멜라토닌을
"멜라토닌을" is the accusative form of "melatonin," a hormone that regulates sleep-wake cycles.
Used as an object of the verb '복용하다' (to take).
나는 잠이 잘 오도록 멜라토닌을 복용합니다.
I take melatonin to help me sleep well.
Used as an object of the verb '처방하다' (to prescribe).
의사가 멜라토닌을 처방했어요.
The doctor prescribed melatonin.
Used as the object of the verb '복용하다' (to take excessively).