noun
EXAMPLES FROM CORPUS
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A synthetic form of melatonin can be bought over-the-counter at health food stores and many pharmacies.
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Daily injections of melatonin given at 3.30 each afternoon, entrained the rats to a 24 hour cycle.
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Perhaps melatonin would help him get a little rest.
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Starlings, which are active during the day, lock on to melatonin when it coincides with the end of their activity.
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The rat does not immediately adjust its daily rhythm to the melatonin .
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The results raise an interesting problem for people studying other effects of melatonin .
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There may be uncertainties surrounding melatonin , but it is clearly the dose of the moment.
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When the sun goes down, the eyes cue the gland to start pumping melatonin .