Yuan Zhi (远志) — TCM Herb for Insomnia, Memory & Heart-Kidney Communication

At a Glance

Herb: Yuan Zhi
Chinese name: 远志 (Yuǎn Zhì)
Latin name: Polygalae Radix
Nature: Warm
Taste: Acrid / Bitter
Meridian: Heart / Kidney / Lung
Category: Herbs that Calm the Spirit
Introduction: 远志 (Yuǎn Zhì, Thin-leaf Milkwort Root) is the dried root or root bark of Polygala tenuifolia or P. sibirica, a small perennial herb in the Polygalaceae family widely distributed across northern and central China. Harvested in spring or autumn, the root is processed to remove the woody core (leaving the cortex, 远志筒) or used whole. The name 远志 — ‘far aspiration’ — reflects its classical reputation for strengthening the mind and enhancing will.
In TCM theory, Yuan Zhi calms the heart and settles the spirit, opens the orifices and dispels phlegm, and reduces swellings and disperses abscesses. It uniquely bridges the heart and kidney, enabling the two organs to communicate (交通心肾), making it central to formulas addressing heart-kidney disharmony with insomnia, palpitations, and forgetfulness. Its acrid-bitter nature disperses phlegm obstruction in both the mind and the lung.

Modern pharmacological studies demonstrate significant neuroprotective, memory-enhancing, and anti-neuroinflammatory effects. Tenuigenin and polygalasaponins activate BDNF signaling, inhibit amyloid-beta aggregation, and protect cholinergic neurons — positioning Yuan Zhi as a candidate for Alzheimer’s disease research.

Calms the heart and settles the spirit (安神定志): For heart-kidney disharmony with insomnia, excessive dreaming, palpitations, and anxiety.
Opens the orifices and dispels phlegm (开窍化痰): For phlegm clouding the heart orifices with mental confusion, epilepsy, and restlessness.
Transforms phlegm and relieves cough (化痰止咳): For productive cough with profuse sputum, chest oppression from phlegm-damp in the lung.
Reduces swellings and disperses abscesses (消肿散结): For carbuncles, breast abscess, and toxic swellings — applied internally and topically.

Clinical Application:
Heart-kidney disharmony insomnia: Paired with Shi Chang Pu, Fu Shen, Long Gu (Kong Sheng Zhen Zhong Dan)
Palpitations and forgetfulness: Combined with Ren Shen, Fu Ling, Long Yan Rou (Gui Pi Tang)
Epilepsy and phlegm obstruction: With Ban Xia, Shi Chang Pu, Tian Nan Xing
Phlegm-cough: With Jie Geng, Xing Ren, Bai Bu for productive cough
Carbuncles and toxic swellings: Ground into powder and applied topically; or combined with Lian Qiao, Jin Yin Hua internally
Dosage: 3–10g in decoction. Honey-prepared (蜜远志) is preferred for cough and lung conditions; plain root for spirit-calming. May cause mild GI irritation — take after meals.

Contraindicated in peptic ulcer and gastritis — saponins irritate gastric mucosa; always take after meals or with honey-prepared form. Use cautiously in excess fire without phlegm — warming nature may aggravate. Contraindicated in pregnancy at high doses. Large doses may cause nausea and vomiting — standard dose 3–10g.

Kong Sheng Zhen Zhong Dan (孔圣枕中丹): Shi Chang Pu, Yuan Zhi, Long Gu, Gui Ban — for heart-kidney disharmony with poor memory and insomnia.
Gui Pi Tang (归脾汤): Ren Shen, Huang Qi, Bai Zhu, Fu Shen, Long Yan Rou, Suan Zao Ren, Mu Xiang, Yuan Zhi, Dang Gui, Gan Cao, Sheng Jiang, Da Zao — for heart-spleen deficiency with palpitations and forgetfulness.
An Shen Ding Zhi Wan (安神定志丸): Fu Shen, Fu Ling, Ren Shen, Yuan Zhi, Shi Chang Pu, Long Chi — for heart qi deficiency with fright palpitations.

Yuan Zhi + Shi Chang Pu: Opens orifices, transforms phlegm, enhances memory; for phlegm-obstructed heart spirit with forgetfulness and insomnia. Source: Kong Sheng Zhen Zhong Dan (孔圣枕中丹).
Yuan Zhi + Fu Shen: Calms heart spirit, settles anxiety; for insomnia with palpitations and fear. Source: An Shen Ding Zhi Wan (安神定志丸).
Yuan Zhi + Ren Shen: Tonifies heart qi, calms spirit, improves memory; for qi deficiency with palpitations and forgetfulness. Source: Gui Pi Tang (归脾汤).
Yuan Zhi + Jie Geng: Transforms lung phlegm, opens chest, relieves cough; for phlegm-damp cough with chest oppression. Source: Yuan Zhi Tang (远志汤), Qian Jin Yao Fang (千金要方).
Yuan Zhi + Long Gu: Calms spirit, anchors the mind, settles fear; for insomnia and palpitations with deficiency anxiety. Source: Kong Sheng Zhen Zhong Dan (孔圣枕中丹).

Shen Nong Ben Cao Jing (《神农本草经》): ‘Governs cough with counterflow and internal injury; supplements insufficiency, expels evil qi, frees the nine orifices, benefits wisdom, sharpens hearing and vision, prevents forgetting, strengthens will, doubles strength; long-term use lightens the body and prevents aging.’
Ben Cao Gang Mu (《本草纲目》): ‘Treats Heart-spirit forgetfulness, quiets the ethereal and corporeal souls, prevents confusion, and fortifies and strengthens the yang pathways.’
Ben Cao Cong Xin (《本草从新》): ‘Yuan Zhi can conduct Kidney qi upward to reach the Heart, enabling Heart-Kidney intercommunication and settling the spirit and mind.’