Serotonin ˌsɛrəˈtoʊnɪn A neurotransmitter that plays a role in controlling mood, eating habits, and sleep patterns.
Cortisol kɔːrˈtɪsɒl A secretion from the adrenal glands that occurs in response to stress and can have damaging health effects when produced too frequently.
Calm kɑːm A state of relaxation or tranquillity, often achieved through mindfulness techniques or meditation.