Polygala tenuifolia (yuǎn zhì; Chinese: 远志) is an herb in the family Polygalaceae which is hardy to USDA Zone 6.

P. tenuifolia contains tenuifolin, senegenin, and polygalacic acid.

[2] It is one of the 50 fundamental herbs used in traditional Chinese medicine, where it is called yuǎn zhì (Chinese: 遠志) and believed to have neuropsychiatric effects.

It has been studied as a potential drug source in depression[3] and Alzheimer's.

[4] However, quality of the herb varies widely, and as of 2020 there have been no toxicological studies or clinical trials.