Serotonin aka 5-hydroxytryptamine (5-HT)

graph TD;
    MoodRegulation["Mood Regulation"] --> Serotonin;
    AppetiteControl["Appetite Control"] --> Serotonin;
    SleepRegulation["Sleep Regulation"] --> Serotonin;
    CognitiveFunctions["Cognitive Functions"] --> Serotonin;
    CardiovascularHealth["Cardiovascular Health"] --> Serotonin;
    Serotonin --> BiochemicalPathways["Biochemical Pathways"];
    Serotonin --> ReceptorInteractions["Receptor Interactions"];
    BiochemicalPathways --> Synthesis;
    Synthesis --> AminoAcids["Amino Acids"];
    ReceptorInteractions --> Neurotransmission["Neurotransmission"];
    Neurotransmission --> PsychologicalWellBeing["Psychological Well-being"];
    Serotonin --> PharmacologicalInterventions["Pharmacological Interventions"];
    PharmacologicalInterventions --> SSRIs["SSRIs"];
    PharmacologicalInterventions --> PsychedelicDrugs["Psychedelic Drugs"];
    SSRIs -.-> MoodRegulation;
    PsychedelicDrugs -.-> CognitiveFunctions;

Wiki

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• in-charge-of:happy
• in-charge-of:happiness