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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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Jul 24 Word of the Day
It’s an acronym standing for Can’t Remember A Fucking Thing. It’s usually used to describe embarrassment at being unable to remember someone (CRAFT moment); going onstage as the lead in the latest theatrical performance and your mind goes completely blank (CRAFT situation); the next morning after a night when you got pissed as a fart and woke up in bed cuddling a traffic cone and a string of fairy lights wound round your prick.
“Where did you go after we left the pub?”
Dunno, CRAFT.”
by AKACroatalin November 07, 2015
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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 UltimateDoge May 17, 2021
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allu is bby and serotonin
allu is serotonin and makes bink very soft
by milkyisaweeb October 11, 2020
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allu legit gives everyone serotonin, also makes bink really soft
by milkyisaweeb October 11, 2020
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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 Brooklyn T. Guy July 07, 2021
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