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Botanical

Polygala Tenuifolia

Polygala tenuifolia, or yuan zhi, is a perennial herb from China and Korea whose root is used in traditional Chinese medicine.

Also listed as Yuan Zhi, Chinese Senega, Mountain Polygala, Seneca Snakeroot

Stress & MoodCognitionSleep

What it is studied for

The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.

StressStress & MoodModerateBNo linked study
MemoryCognitionModerateBNo linked study
Brain FogCognitionModerateBNo linked study
Mood SupportStress & MoodModerateBNo linked study
Sleep qualitySleepModerateBNo linked study
AnxietyStress & MoodSmallCNo linked study
All 8 rated effectsGrouped by health goal, with the publications behind each rating

Why people take it

Stress & Mood25%
Cognition22.7%
Energy18.2%
Sleep9.1%
Essential Health9.1%
Longevity6.8%

SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.

Sources

  1. SuppCo · Polygala Tenuifolia nutrient profile