Shennong Bencao Jing: The Divine Farmer's Materia Medica — Foundation of Chinese Herbal Medicine
Explore the Shennong Bencao Jing (神农本草经), the earliest surviving Chinese pharmacological text. Learn how it classified 365 herbs into three grades and established principles still used in TCM today.
What is the Shennong Bencao Jing?
The Shennong Bencao Jing (神农本草经), commonly known as the Divine Farmer’s Materia Medica, is the oldest surviving systematic pharmacological text in Chinese medicine. It catalogues 365 medicinal substances — one for each day of the year — and organizes them into a classification system that remains foundational to TCM herbal practice today.
The text is attributed to the legendary Shennong (神农), the “Divine Farmer,” a mythological emperor believed to have taught agriculture and herbal medicine to the Chinese people around 2700 BCE. Legend says Shennong personally tasted hundreds of herbs to determine their properties, even suffering poisoning dozens of times in the process.
While the true authorship remains unknown, modern scholars date the text’s compilation to approximately 25–220 CE during the Eastern Han Dynasty, making it roughly contemporary with the Huangdi Neijing.
The Three Grades of Herbs
The Shennong Bencao Jing’s most influential contribution is its three-tier classification system for herbs, based on their safety, strength, and appropriate use:
Upper Grade (上品) — 120 Herbs
“Ruler” herbs — safe, nourishing, suitable for long-term use.
These herbs are described as:
- Non-toxic (or very low toxicity)
- Nourishing to Qi, Blood, Yin, and Yang
- Suitable for long-term use without harm
- Comparable to food-grade supplements
They correspond to Heaven and are meant to nourish life and prevent disease.
Examples:
- Ren Shen (Ginseng) — tonifies original Qi
- Gou Qi Zi (Goji Berry) — nourishes Liver and Kidney
- Gan Cao (Licorice) — harmonizes formulas, tonifies Spleen
- Shu Di Huang (Prepared Rehmannia) — nourishes Blood and Kidney Yin
- Fu Ling (Poria) — drains dampness, calms the spirit
Middle Grade (中品) — 120 Herbs
“Minister” herbs — moderate strength, used to correct specific imbalances.
These herbs are described as:
- Some toxicity — requires awareness but not extreme caution
- Used to treat illness and correct imbalances
- Can tonify or drain depending on the herb
- Correspond to Humanity
Examples:
- Bai Shao (White Peony) — nourishes Blood, softens the Liver
- Chai Hu (Bupleurum) — moves Liver Qi, resolves Shaoyang
- Dang Gui (Angelica) — tonifies and moves Blood
- Huang Qin (Scutellaria) — clears Heat, dries dampness
- Chuan Xiong (Sichuan Lovage) — moves Blood and Qi in the upper body
Lower Grade (下品) — 125 Herbs
“Assistant” herbs — strong, potentially toxic, used for acute and severe conditions.
These herbs are described as:
- Often toxic — requires careful dosing and short-term use
- Powerful and direct in their action
- Used for acute illness, severe conditions, and emergencies
- Should not be used long-term
- Correspond to Earth
Examples:
- Da Huang (Rhubarb) — powerfully purges Heat and accumulations
- Fu Zi (Aconite) — rescues devastated Yang (requires special processing)
- Ban Xia (Pinellia) — transforms phlegm (requires processing to reduce toxicity)
- Ma Huang (Ephedra) — strongly induces sweating, opens the Lungs
- Xi Xin (Asarum) — disperses Cold, stops pain (use in small doses)
Key Principles Established by the Text
1. Flavor and Nature
The Shennong Bencao Jing systematically recorded each herb’s:
- Four Natures — Hot, Warm, Cool, Cold
- Five Flavors — Sweet, Sour, Bitter, Pungent, Salty
- Toxicity level — toxic, slightly toxic, or non-toxic
This became the foundation for all subsequent herbology.
2. Herb Pairing and Incompatibility
The text introduced the concepts of:
- Mutual reinforcement (相须) — two similar herbs work better together
- Mutual assistance (相使) — one herb enhances another’s effect
- Mutual restraint (相畏) — one herb reduces another’s toxicity
- Mutual incompatibility (相反) — herbs that should NOT be combined (the famous “Eighteen Incompatibilities”)
3. Preparation Methods
The text noted that herbs could be used in different forms — pills, powders, decoctions, and wines — and that some herbs required specific preparation to modify their properties or reduce toxicity.
The Concept of “Tasting Herbs”
The legend of Shennong tasting herbs reflects a profound truth about TCM pharmacology: the properties of herbs were discovered through direct experience, not theory alone. TCM herb knowledge was built through centuries of careful observation — what happens when you eat this root? Does it make you sweat? Does it cool you down? Does it stop pain?
This empirical tradition is why the Shennong Bencao Jing’s descriptions remain clinically relevant 2,000 years later. The herbs were tested on real human bodies and their effects recorded with precision.
Historical Transmission
The original Shennong Bencao Jing text was lost as a complete work around the Tang Dynasty (618–907 CE). However, its contents survived through:
- Quotations in later texts — especially Tao Hongjing’s Bencao Jing Jizhu (Collected Commentaries on the Materia Medica, ~500 CE)
- Reconstructions — scholars in the Qing Dynasty (19th century) pieced the text back together from surviving quotations
- Integration into larger works — the Xinxiu Bencao (Newly Revised Materia Medica, 659 CE) and later pharmacopeias preserved its content
Influence on Later Works
The Shennong Bencao Jing directly influenced:
| Text | Era | Contribution |
|---|---|---|
| Bencao Jing Jizhu | ~500 CE | Tao Hongjing’s commentary and expansion |
| Xinxiu Bencao | 659 CE | First government-sponsored pharmacopeia |
| Zhenglei Bencao | 1082 CE | Comprehensive materia medica compilation |
| Bencao Gangmu | 1578 CE | Li Shizhen’s encyclopedic masterpiece |
Every major Chinese materia medica built upon the foundation laid by the Shennong Bencao Jing.
Why This Text Matters Today
The three-grade classification system is still taught in TCM schools worldwide. The principle that safe, nourishing herbs should be the foundation of daily health while strong, potentially toxic herbs should be reserved for acute illness remains a cornerstone of responsible herbal practice. In an era of unregulated supplement use, this 2,000-year-old wisdom about graduated safety levels is remarkably relevant.
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FAQ
Who is this article for?
This article is for readers who want a practical, beginner-friendly understanding of this TCM topic.
Can this article replace professional medical advice?
No. This content is educational only and should not replace diagnosis or treatment from a qualified healthcare professional.
Disclaimer
This content is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment.