Androgenetic Alopecia — Factor & Intervention Model
Pull the intervention levers on the left. The middle shows how each underlying causal factor shifts; the top shows a single relative outcome index. Lever strength is weighted by evidence tier (A>B>C>D), and each factor has diminishing returns — so covering several different angles beats piling onto one. Built from the AGA Treatment Evidence Map.
⚠ Theoretical & relative only. This is an educational illustration of how mechanisms interrelate — the numbers are relative model estimates, not clinical predictions and not medical advice. Real outcomes vary by person, genetics, dose, and adherence. Prescription choices need a clinician.
Intervention levers
What the sliders mean: each slider is that treatment's intensity / adherence.
0% = not using · ~50% (middle) = partial (half-dose or used inconsistently, roughly half the effect) · 100% (full right) = full recommended protocol done consistently (maximum modeled effect).
The effect scales with the slider, then each factor applies diminishing returns.
Index is a unitless relative scale: roughly −10 (untreated, ongoing loss) up to ~+50 (maximal plausible multi-angle stabilization + regrowth). It is not a percentage of hair.
Causal factors (what your levers move)
How the factors connect
Genetic susceptibility sets how strongly DHT damages follicles. DHT (made from testosterone by 5α-reductase) binds the follicle receptor → drives miniaturization, helped along by inflammation, poor microcirculation/tension, and oxidative stress. Growth/anagen drive and good nutrition push the other way. Nodes brighten as your levers improve them.