The Herb Cabinet 本草

远志 yuǎn zhì

Polygala tenuifolia · polygala, thinleaf milkwort root

Slightly warm Bitter · Pungent HeartKidneyLung

“The name means "far-reaching will." The scholars' herb — for the mind that forgets, the heart that startles, and the thoughts that fog instead of flow.” — Lao Xinglin

What the tradition says

The old physiologists imagined memory as a conversation between heart and kidney — spirit above, will and essence below — and yuan zhi as the herb that keeps the line open^[1]. "Far-reaching will" treats forgetfulness, palpitations with anxiety, insomnia with restless dreaming, and the disorientation the tradition attributed to "phlegm misting the heart's orifices"; it also expels stubborn phlegm from the lungs and eases angry boils^[1]. In Gui Pi Tang it is the assistant that reconnects what worry has scattered — the scholar's herb in the scholar's formula.

What the research says

Polygala's saponins and oligosaccharide esters are genuinely interesting to neuroscience labs — cognition and neuroprotection studies in animals, and early-phase human work in East Asia — but no clinical evidence base yet justifies memory claims. We file the "nootropic" reputation where it currently belongs: the laboratory.

Where to be careful

More than its gentle formula-mates: yuan zhi's saponins irritate — the tradition itself flags stomach upset and prepares the root (licorice-water processing) to soften it, and withholds it in gastritis and ulcer patterns^[1]. The classical texts also treat it as an herb to dose modestly and not forever.

In the pharmacy

The hollow, tube-like root bark of Polygala tenuifolia, usually sold prepared (zhi yuan zhi). Thin, wrinkled, faintly acrid — a small root with a long reputation among people who lived by their memory.

Reviewed 2026-08-25