Shén Nóng Běn Cǎo Jīng: Shennong’s Classic of Materia Medica

How a lost book is rebuilt from the quotations of its successors.

The Shennong Bencao Jing is the earliest transmitted bencao of the Chinese tradition, and yet nobody has seen its manuscript. The text was lost as an independent work, and what is read today are reconstructions: editions assembled by gleaning the quotations that later repertories preserved. The operation is possible because Chinese materia medica was for centuries a cumulative genre, in which each author reproduced his predecessors before adding his own material.

The decisive link is Tao Hongjing, who around the year 500 composed the Bencao Jing Jizhu, doubling the repertory to some seven hundred and thirty entries and — crucially — distinguishing the inherited material from his own additions by ink colour. That marking let philologists separate the layers centuries later. The reconstructions in circulation come mainly from the Qing period, such as Sun Xingyan’s (1799), and from the Japanese scholar Mori Tateyuki (1854); they differ from one another in order and in some entries.

• The original work was lost; no ancient manuscript survives.
• It is reconstructed from quotations in later bencao.
• Tao Hongjing (c. 500) marked inherited text and his own additions in different inks.
• The standard reconstructions are Qing-period and nineteenth-century Japanese, and do not fully agree.

Bencao 本草 Literally “roots and herbs”. The name of the Chinese materia medica genre: repertories of substances with names, properties, and uses, chained together by citation for almost two thousand years.

What the attribution means and the intellectual world the text came from.

Shennong, the “divine farmer”, is a mythical culture hero credited by tradition with inventing agriculture and testing medicinal plants. The legend that he tasted a hundred herbs already circulates in texts older than this work, such as the Han-period Huainanzi: it does not come from the book, the book claims it. Placing a body of knowledge under the name of an ancestral sage was, in early China, a way of granting it authority, not of documenting who wrote it.

The compilation is placed in the late Han, around the first and second centuries, and probably grew by accretion. Its horizon is not merely therapeutic: the vocabulary of the upper grade — “lightening the body”, “extending the years” — belongs to the longevity practices and the pursuit of transcendence characteristic of the period. Reading those formulas as contemporary pharmacological claims is an anachronism; they are the cultural goals of a specific historical moment.

• Shennong is a mythical figure, not an author.
• The hundred-herbs legend predates the book and is external to it.
• Accepted dating: late Han, formed by accretion.
• The upper grade’s language reflects Han-period longevity practices.

Ascribed work A text assigned to a prestigious figure of the past to lend it authority. Recognizing the device prevents mistaking a cultural emblem for a fact about authorship.

The architecture of the text and the logic that orders its entries.

The work distributes three hundred and sixty-five substances — as many as the year has days, an explicit and deliberate correspondence — across three grades. The upper gathers one hundred and twenty materials called “sovereigns”, described as free of toxicity and fit for prolonged use. The middle, another hundred and twenty, are “ministers”, of variable toxicity, whose use calls for discrimination. The lower, one hundred and twenty-five, are “assistants and envoys”, described as mostly toxic and not meant for continued use.

The hierarchy is at once cosmological and practical: the three grades are made to correspond with heaven, man, and earth, and those same titles — sovereign, minister, assistant, envoy — reappear as the grammar of formula composition, ordering each ingredient’s role. It bears stressing that “free of toxicity” is a classical category here, not a safety assessment: among the upper-grade materials stands cinnabar, that is, mercury sulfide.

• 365 substances corresponding to the days of the year.
• Shang (120), Zhong (120), and Xia (125): sovereigns, ministers, assistants, and envoys.
• The grades align with heaven, man, and earth.
• The upper grade’s freedom from toxicity is a classical category, not a warrant of safety.

San Pin 三品 The “three grades” into which substances are classified — upper, middle, and lower — ordered by declared toxicity and by fitness for prolonged use.

The descriptive vocabulary the text inaugurates and that is still in use.

Every entry follows a fixed pattern: name and synonyms, flavor, nature, presence or absence of toxicity, what the substance “governs”, and often where it is gathered. The flavors are five — sour, salty, sweet, bitter, acrid; the natures four: cold, hot, warm, and cool. The text does not explain why a plant is cold: it declares it. That minimal format became the standard entry for all subsequent Chinese materia medica.

Flavor and nature are neither organoleptic observations nor thermal measurements: they are conventional descriptors placing a substance within the Yin-Yang system and the Five Phases, allowing it to be reasoned about before being used. The preface itself further warns that the time of gathering, drying in shade or sun, processing, the place of origin, and the distinction between genuine and counterfeit material all change what one is holding: the identity of a drug was never a trivial matter.

• Fixed entry: name, flavor, nature, toxicity, principal action, and provenance.
• Five flavors and four natures as conventional descriptors.
• They are categories of the system, not measured properties.
• The preface already distinguishes origin, gathering, processing, and authenticity.

Qi and Wei 气味 “Nature and flavor”. The descriptive pair with which the tradition characterizes a substance: four thermal natures and five flavors, both understood as categories of a model.

How the text thinks about combinations and about controlling toxicity.

The preface lists seven ways two substances can relate when combined, known as qi qing, the “seven relations”. They run from use on its own, through mutual reinforcement between like materials, one assisting another, one restraining another’s toxicity, reciprocal cancelling of effects, open antagonism, and the active suppression of another’s toxicity. It is the first formulation of a Chinese theory of interaction between materials.

The practical consequence the text itself draws is methodological: combinations that reinforce or assist are suitable, antagonistic ones are to be avoided, and where toxicity is present one turns to the relations that restrain or suppress it. From this grammar derive, centuries later, the mnemonic lists of incompatibilities that circulated from the Jin-Yuan period onward. The scheme is remarkable for its conceptual ambition; it is not, however, a pharmacology of interactions in the current sense.

• Seven relations: alone, mutual reinforcement, assistance, restraint, aversion, antagonism, and suppression.
• The text’s criterion: prefer reinforcement and assistance, avoid antagonism.
• Toxicity is managed through the relations that restrain it.
• Later lists of incompatibilities derive from this scheme but are far later.

Qi Qing 七情 The “seven relations” between combined substances. The term reuses the expression that elsewhere names the seven emotions, with no connection to them.

Botanical identity, toxicity, and legality: three mandatory filters.

This book documents how materia medica was thought about two thousand years ago, and that is its value. It does not work as a guide to use, for three cumulative reasons. The first is identity: one historical name has designated different species by period and region, and the best-documented case is substitution by species of the genus Aristolochia, whose aristolochic acid is associated with severe nephropathy and urothelial cancer. Change the name and you change what is in the jar.

The second reason is toxicity: the text includes minerals such as cinnabar, mercury sulfide, and substances handled today under strict control or not used at all. The third is legal: part of the bencao tradition draws on animal materials from species protected under CITES, whose trade is illegal. To this add that the text offers no doses interpretable today. Study it as history of pharmacy; for any decision about health, consult a qualified professional.

• The botanical identity behind a historical name has shifted with time and place.
• The Aristolochia case documents the real harm of a name substitution.
• It includes toxic minerals, such as cinnabar, mercury sulfide.
• Part of the tradition uses species now protected and illegal to trade.

Botanical identity The correspondence between a drug name and the species that actually supplies it. In historical materia medica it is unstable, and verifying it is the first step of any serious reading.