Oxytocin: Definition, Function & Why It Is More Than the Love Hormone
Oxytocin is a neuropeptide hormone that co-ordinates social bonding and trust. Learn how it works in the brain and why ‘love hormone’ misleads.
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Progesterone: Definition, Function & Role in Sleep and Mood
Progesterone is the steroid hormone that prepares the uterine lining for pregnancy and drives deep sleep and mood stability via GABA-A receptors.
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Serotonin: Definition, Function & Why the Mood Story Is Wrong
Serotonin is a neurotransmitter made mostly in the gut. Learn its real functions, why the chemical imbalance theory failed, and what the evidence shows.
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Thyroid Hormones (T3, T4): Definition, Function & Metabolic Control
Thyroid hormones T3 and T4 drive whole-body metabolism via the HPT axis. How hypo- and hyperthyroidism affect energy, weight, and performance.
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Testosterone: Definition, Function & What Optimal Levels Look Like
Testosterone is the principal androgen in the human body. It controls muscle mass, bone density, libido, and mood; only 2-3% is biologically active.
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Leptin: Definition, Function and the Science of Leptin Resistance
Leptin is the adipocyte-derived hormone that signals satiety to the hypothalamus. Learn how it works, what leptin resistance means, and why sleep matters.
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Cortisol: The Complete Science of Your Body’s Primary Stress Hormone
What cortisol actually does, why rhythm matters more than level, and what 36,823 people reveal about chronic stress. Evidence-ranked deep dive.
