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LMAO NO serotonin is a neurotransmitter neurotransmitters affects your Nervous System. It affects your mood.
Yes it's another function of serotonin.
Serotonin is also a mood regulator. It is often used to treat depression.
The love hormone is Oxytocin not Serotonin... Serotonin is a vasoconstrictor (constrict blood vessels)