A neurotransmitter believed to regulate mood. SSRI's inhibit the reuptake of serotonin in the brain (leading there to be more serotonin left as a result), hopefully improving the mood.

Personally, a good blast on the Codeine cheers me up more than any SSRI.
Perhaps it's my endorphine system rather than my serotoninergic system that is fucked.
A lack of Serotonin is believed to be a cause of depression. It also controls appetite, among other things.

Antidepressants often (through various mechanisms) increase the amount of serotonin in the brain.

MDMA (Ecstacy) causes a massive (cascading) release of serotonin in the brain - responsible for both it's euphoric effects, and the depressive aftereffects (less serotonin remains in the brain, until generated again)
by heterocodeine December 15, 2008
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A friend that will stick with you through thick and thin. A friend who won't tell you that you're always right. A friend who actually gives you the truth whether you like it or not. A friend who gives you more joy than anyone you know. And finally the most important, a friend who goes by Annabelle.
You're my Serotonin!
by Allie_Rae_Rae April 9, 2022
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A neurotransmitter that is most known for regulating mood.

While the release of serotonin has been commonly associated with producing feelings of happiness and content, it is a misconception that this is its primary function (it's not). Serotonin's range of functions in the human body are very broad and complex. The chemical plays a crucial role in cognition, memory, reward, and learning as well as numerous physiological processes such as vomiting and the constriction of blood vessels. Without Serotonin, you probably would not even be alive.
Person 1: This video gives me so much serotonin.
Person 2: Same! I can feel the good vibes flow through me.
Me: I hate to be a party pooper, but FYI Serotonin isn't entirely responsible for giving you "the good vibes". What you are describing is a complex rush of hormones and neurotransmitters made up of serotonin as well as dopamine, oxytocin, and other endorphins. These are commonly referred to as your "happy hormones".
by UwUltimateDoge May 18, 2021
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Serotonin, also known as the "feel good hormone" is a neurotransmitter known for boosting your mood. Not only does it help boost your mood, but it also plays a role in maintaining good digestive health. In fact 90% of serotonin is produced in the intestines and the blood platelets. If you have a high self esteem, sleep well, generally in a good mood, enjoy a healthy diet, memorize things easily and have a strong sexual desire, then that means your serotonin levels are at an adequate level which maintains good mental health as a result. Signs that serotonin levels are at a lower level are if one is angry, has a lower self esteem, comfort eats, and forgets things easier, this means that one may be serotonin deficient and may result in depression and anxiety. To boost your serotonin levels, eat foods like chicken, cheese, beans and bananas. Also get enough carbohydrates. You may want to sit out in the sun as Vitamin D helps maintain a sufficient quantity of serotonin levels.
Serotonin feels good.
by Mellon Collie July 7, 2021
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Serotonin is a state of cole induced happiness
by Niccity October 22, 2020
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allu legit gives everyone serotonin, also makes bink really soft
by milkyisaweeb October 12, 2020
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allu is bby and serotonin
allu is serotonin and makes bink very soft
by milkyisaweeb October 12, 2020
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