melatonin
noun
mel·a·to·nin
ˌme-lə-ˈtō-nən 
: a vertebrate hormone that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms
Examples of melatonin in a Sentence
Recent Examples on the Web
However, information on the long-term effects of melatonin use in children is limited and parents are advised to exercise caution.
—
Saman Shafiq, USA TODAY, 20 May 2024
A day care owner and three of her employees have been arrested after allegedly sprinkling melatonin on children's food, police say.
—Jon Haworth, ABC News, 16 May 2024
Melatonin production: Magnesium helps to produce and maintain melatonin.
—Allison Futterman, Discover Magazine, 15 May 2024
There are no major side effects to worry about—melatonin shifts the circadian rhythm with minimal side effects, the Springer article found.
—Moira Lawler, Condé Nast Traveler, 2 May 2024
That guessing game isn’t great when too much melatonin can lead to fatigue, dizziness, and confusion, among other wack side effects.
—Ali Finney, SELF, 19 Apr. 2024
Those who experience discomfort relief from CBD and melatonin are also likely to experience better sleep, if only indirectly.
—Medterra, Discover Magazine, 3 Apr. 2024
For some, relying on melatonin is key while others opt for a more natural approach.
—Clare Mulroy, USA TODAY, 15 Mar. 2024
Similarly, exposure to sunlight in the morning stops melatonin production and bumps up the wake-up hormone cortisol.
—Adria Greenhauff, Better Homes & Gardens, 8 Mar. 2024
Saman Shafiq, USA TODAY, 20 May 2024
A day care owner and three of her employees have been arrested after allegedly sprinkling melatonin on children's food, police say.
—Jon Haworth, ABC News, 16 May 2024
Melatonin production: Magnesium helps to produce and maintain melatonin.
—Allison Futterman, Discover Magazine, 15 May 2024
There are no major side effects to worry about—melatonin shifts the circadian rhythm with minimal side effects, the Springer article found.
—Moira Lawler, Condé Nast Traveler, 2 May 2024
That guessing game isn’t great when too much melatonin can lead to fatigue, dizziness, and confusion, among other wack side effects.
—Ali Finney, SELF, 19 Apr. 2024
Those who experience discomfort relief from CBD and melatonin are also likely to experience better sleep, if only indirectly.
—Medterra, Discover Magazine, 3 Apr. 2024
For some, relying on melatonin is key while others opt for a more natural approach.
—Clare Mulroy, USA TODAY, 15 Mar. 2024
Similarly, exposure to sunlight in the morning stops melatonin production and bumps up the wake-up hormone cortisol.
—Adria Greenhauff, Better Homes & Gardens, 8 Mar. 2024
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'melatonin.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near melatonin
Cite this Entry
“Melatonin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/melatonin. Accessed 28 May. 2024.
Copy CitationKids Definition
melatonin
noun
mel·a·to·nin
ˌmel-ə-ˈtō-nən
: a hormone that is secreted by the pineal gland especially in response to darkness and has been linked to the regulation of bodily functions or activities (as sleep) that occur in approximately 24 hour cycles
Medical Definition
melatonin
noun
mel·a·to·nin
ˌmel-ə-ˈtō-nən
: a vertebrate hormone C13H16N2O2 that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms
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