It doesn’t, at least for me.
Jokes aside, it’s a hormone (eli5 –chemicals in blood) and a neurotransmitter (molecules sending messages between neurons or neurons to muscles), it helps with brain’s proper functioning of many things.
It’s still under research but we do find a connection between low serotonin levels and long term bad mood/depression, low motivation, low appetite etc. Also works to regulate our biological clock and digestion.
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