Tao Ren (桃仁) — TCM Herb for Blood Stasis, Dysmenorrhea & Dry Constipation
Key Takeaways
- Nature: Neutral | Taste: Bitter, Sweet
- Category: Herbs that Activate Blood and Resolve Stasis
- Latin: Persicae Semen
At a Glance
- Herb: Tao Ren
- Chinese name: 桃仁 (Táo Rén)
- Latin name: Persicae Semen
- Nature: Neutral
- Taste: Bitter / Sweet
- Meridian: Heart / Liver / Lung / Large Intestine
- Category: Herbs that Invigorate Blood and Dispel Blood Stasis
- Introduction: 桃仁 (Táo Rén, Peach Kernel) is the dried ripe seed of Prunus persica or P. davidiana — deciduous trees in the Rosaceae family cultivated throughout China. Harvested in summer when the fruit is ripe, the kernels are removed from the stone, dried, and used raw or stir-fried. The flat, oval seeds with their characteristic pointed tip and brown seed coat are one of TCM’s most frequently prescribed blood-invigorating herbs.
In TCM theory, Tao Ren invigorates blood and removes stasis, moistens the intestines and unblocks the bowels. As a seed rich in fatty oils, it provides a dual action unique among blood-invigorating herbs: it both dispels blood stasis and lubricates the large intestine, making it valuable when blood stasis coexists with dry constipation. It is a principal constituent of Xue Fu Zhu Yu Tang and Tao He Cheng Qi Tang — two of the most important blood-stasis formulas in the TCM canon.
The combination of Tao Ren and Hong Hua (Peach Kernel and Safflower) is TCM’s most celebrated blood-invigorating pair, appearing together in multiple major formulas for gynecological, cardiovascular, and traumatic blood stasis conditions.
Action
- Invigorates blood and removes stasis (活血化瘀): For blood stasis — dysmenorrhea, amenorrhea, post-partum lochia retention, abdominal masses, traumatic injury, chest bi pain.
- Moistens the intestines and unblocks the bowels (润肠通便): For dry constipation from intestinal fluid insufficiency or blood deficiency.
- Relieves cough and calms wheezing (止咳平喘): Secondary action for lung qi stagnation with cough — amygdalin’s mild antitussive effect.
- Resolves intestinal abscess (消痈): For intestinal abscess (appendicitis) with blood stasis — combined with Da Huang and Mu Dan Pi.
Clinical Application
- Clinical Application:
- Dysmenorrhea and amenorrhea: With Hong Hua, Dang Gui, Chuan Xiong, Chi Shao (Xue Fu Zhu Yu Tang, Tao Hong Si Wu Tang)
- Blood stasis constipation: With Da Huang, Gui Zhi (Tao He Cheng Qi Tang)
- Post-partum lochia retention: With Hong Hua, Pu Huang, Wu Ling Zhi
- Intestinal abscess (appendicitis): With Da Huang, Mu Dan Pi, Mang Xiao (Da Huang Mu Dan Pi Tang)
- Chest bi with blood stasis: With Hong Hua, Dan Shen, Chuan Xiong
- Dry constipation: With Huo Ma Ren, Xing Ren, Dang Gui
- Dosage: 5–10g in decoction. Crush before decocting for maximum extraction. Stir-fried (炒桃仁) for stronger blood-invigorating; raw for intestinal moistening.
Precautions
- Contraindicated in pregnancy — blood-invigorating action. Not appropriate for loose stools or diarrhoea — fatty oils worsen. Amygdalin toxicity: do not consume raw in large quantities; processing (brief boiling or stir-frying) reduces amygdalin content. Maximum dose 10g — excessive amounts cause HCN toxicity (nausea, headache, respiratory distress). Use cautiously in bleeding disorders without blood stasis.
Formula
- Xue Fu Zhu Yu Tang (血府逐瘀汤): Tao Ren, Hong Hua, Dang Gui, Sheng Di, Chi Shao, Chuan Xiong, Chai Hu, Zhi Ke, Jie Geng, Niu Xi, Gan Cao — blood stasis in the chest.
- Tao He Cheng Qi Tang (桃核承气汤): Tao Ren, Da Huang, Gui Zhi, Mang Xiao, Gan Cao — blood stasis in the lower jiao.
- Gui Zhi Fu Ling Wan (桂枝茯苓丸): Gui Zhi, Fu Ling, Mu Dan Pi, Tao Ren, Chi Shao — uterine masses and dysmenorrhea.
Combinations
- Tao Ren + Hong Hua: The cardinal blood-invigorating pair; together they synergistically dispel stasis throughout the body. Source: Tao Hong Si Wu Tang (桃红四物汤), and most major blood-stasis formulas.
- Tao Ren + Da Huang: Purges blood stasis from the lower jiao; for blood stasis constipation and intestinal abscess. Source: Tao He Cheng Qi Tang (桃核承气汤), Shang Han Lun.
- Tao Ren + Mu Dan Pi: Cools and invigorates blood; for heat-blood stasis in intestinal abscess. Source: Da Huang Mu Dan Pi Tang (大黄牡丹皮汤).
- Tao Ren + Huo Ma Ren: Dual intestinal moistening; for dry constipation from blood deficiency and fluid insufficiency. Source: Run Chang Wan (润肠丸).
- Tao Ren + Gui Zhi: Warms and invigorates blood, disperses cold stasis; for cold blood stasis in uterus and lower abdomen. Source: Gui Zhi Fu Ling Wan (桂枝茯苓丸), Jin Gui Yao Lue.
Pharmacological Effects
Classic Description
- Shen Nong Ben Cao Jing (《神农本草经》): ‘Governs stasis blood, blood obstruction, concretions and conglomerations, pathogenic qi, and kills small parasites.’
- Ben Cao Gang Mu (《本草纲目》): ‘Treats blood stagnation with wind impediment and bone-steaming, Liver malaria with cold and heat, and postpartum blood diseases.’
- Ben Cao Bei Yao (《本草备要》): ‘Bitter to drain stagnant blood, sweet to generate new blood; moistening and moving downward — treats heat entering the blood chamber and blood dryness with constipation.’