How your body actually works.
Hormones, peptides, neurotransmitters, and the mechanisms behind them. Written directly. No hedging, no watered-down disclaimers on every paragraph. Click anywhere on the body to begin.
Deep dives
All articles →Dopamine, Explained
Dopamine doesn't make you feel good — it makes you want. The complete guide to the prediction-error neurotransmitter, motivation, addiction, and why the "dopamine detox" is both right and wrong.
Peptides 101
A direct introduction to therapeutic peptides — what they are, what the evidence actually says, which ones have real data vs. marketing, legal status, and how to think about them without getting scammed.
Sleep Is a Hormonal Event
Every major hormonal axis runs on a sleep schedule. The real cost of sleep debt isn't grogginess — it's measurable testosterone, insulin, cortisol, and growth hormone dysregulation within a week.
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The primary glucocorticoid. Runs a sharp morning rhythm, mobilizes fuel under stress, and wrecks you when chronically elevated.
The primary female sex steroid. Estradiol is the active one, and it shapes far more than reproduction — bone, brain, vessels, skin, mood.
The anabolic master switch. Pancreatic beta cells release it when fuel is abundant — most metabolic disease is a story of this signal breaking.
The primary androgen. Runs male development, supports libido and tissue in both sexes, and gets blamed for nearly everything.