Notoginseng (San Qi / Tian Qi) Pharmacology — The Healing Root Behind Yunnan Baiyao

Twist the cap off a bottle of Yunnan Baiyao spray, or shake the famous red-and-white powder into a sterile gauze, and the active core of the formula is not menthol, not borneol, not camphor. It is a beige, slightly sweet, faintly bitter root powder ground from a Wenshan mountainside crop that classical Chinese medicine has called 三七 San Qi — or, when farmed rather than wild-harvested, 田七 Tian Qi — for nearly five centuries. Western herb books translate it as notoginseng (Latin: Panax notoginseng), the lesser-known cousin of Asian and American ginseng.

Outside East Asia, notoginseng is best known to readers of cardiology journals as the source of the Panax notoginseng saponins (PNS) being trialled for ischaemic stroke and angina. Inside East Asia, however, the root has a much older job description: it stops bleeding, dissolves bruises, and accelerates wound healing. That dual personality — a herb that simultaneously promotes coagulation and improves microcirculation — is the pharmacological puzzle this guide unpacks. It is also the reason a single mountain ginseng ended up at the centre of arguably the most famous trauma patent medicine ever made in China.

What San Qi Actually Is

Panax notoginseng (F.H. Chen) is a perennial herb in the Araliaceae family, the same family as Korean ginseng (Panax ginseng) and American ginseng (Panax quinquefolius). All three share the dammarane-type triterpene saponins that define the genus. What separates notoginseng is the saponin profile — higher concentrations of ginsenoside Rb1, Rd, and Rg1 than either of its cousins — and the presence of a small but pharmacologically loaded molecule called dencichine that the other Panax species essentially lack.

The plant is fussy. It will only grow well between 1,200 and 1,800 metres of elevation, demands shade cloth, prefers the mineral-rich red soils of southwestern China, and is so depleting to soil that the same field cannot support a second crop for ten to fifteen years. The medicinal industry is concentrated in Wenshan Prefecture, Yunnan Province, which produces somewhere north of 95% of the world’s commercial supply. Wenshan San Qi has held a Chinese geographical-indication protection since 2002.

Classical pharmacopoeias mention the root from the Ming dynasty onwards. Li Shizhen’s Bencao Gangmu (1578) describes San Qi as 金不換 — “not to be exchanged for gold” — and recommends it for sword wounds, postpartum bleeding, traumatic injuries, and “blood that will not stop.” Li notes the root has the rare property of being able to “stop bleeding without leaving stasis” — a phrase that turns out, four centuries later, to be a remarkably good description of what the saponins and dencichine do in combination.

The root itself is harvested in the third or fourth growing year, washed, dried, and graded by the number of “heads” per jin (catty). The smaller and more compact the head, the higher the grade — a top-grade “20-tou” specimen is the size of a chestnut and commands prices in the hundreds of US dollars per kilogram. Ground San Qi powder is the form that ends up in Yunnan Baiyao and most topical liniments.

The Active Chemistry — Two Classes Doing Two Different Jobs

Modern phytochemistry has identified over 200 distinct compounds in Panax notoginseng. For trauma and topical applications, two groups carry essentially all of the pharmacological weight.

Triterpene saponins (PNS) — The headline class. Notoginseng contains more than 100 individual saponins, broadly divided into two structural families: the 20(S)-protopanaxadiol group (which includes ginsenoside Rb1, Rb2, Rb3, Rd, and Rg3) and the 20(S)-protopanaxatriol group (ginsenoside Rg1, Re, Rh1, and the species-defining notoginsenoside R1). The total saponin extract from the root is what the literature calls Panax notoginseng saponins or PNS, and it is the fraction marketed in injectable form as Xuesaitong and orally as Sanchi tablets across Chinese hospitals.

The dominant individual saponins by mass are ginsenoside Rb1, ginsenoside Rg1, and notoginsenoside R1. These three compounds account for the bulk of cardiovascular and microcirculatory research and are the markers used for quality control in the Chinese Pharmacopoeia.

Dencichine — A non-protein amino acid (β-N-oxalyl-L-α,β-diaminopropionic acid) found in only trace amounts in other Panax species but in measurable concentration in San Qi. It is a small, water-soluble, polar molecule — chemically nothing like the saponins — and it is the compound that does the rapid haemostatic work. Modern analytical work has confirmed dencichine as the principal bleeding-time-shortening constituent in Yunnan Baiyao formulations.

Minor constituents — Polysaccharides (notoginsenan PA, PB), volatile oils (a few percent, dominated by α-guaiene and β-elemene), flavonoids, polyacetylenes, and small amounts of free amino acids. These contribute to anti-inflammatory and immune-modulating effects but are secondary to the saponin–dencichine axis.

The Pharmacology — Stopping Bleeding and Moving Blood

The classical TCM phrase for what San Qi does is 化瘀止血 (hua yu zhi xue) — “dissolves stasis and stops bleeding.” Read literally, this is a contradiction: a herb that simultaneously promotes coagulation (to stop bleeding) and breaks up clotted blood (to move stasis) should not exist. Modern pharmacology has shown that the contradiction resolves cleanly when you separate the two active classes.

Dencichine — The Haemostatic Half

Dencichine is the molecule responsible for the rapid bleeding-time reduction that makes Yunnan Baiyao famous. The mechanism, worked out across the 2000s and consolidated in a series of British Journal of Pharmacology and Frontiers in Pharmacology studies, is now reasonably well understood:

What makes dencichine clinically interesting is that this happens without altering coagulation factors in plasma in a way that produces hypercoagulable states elsewhere. The amino acid is rapidly cleared, its action is largely local, and the haemostatic effect is concentrated where platelets are already activated by tissue damage. That is the pharmacological rationale for sprinkling Yunnan Baiyao powder directly on a wound.

Saponins — The Microcirculatory Half

The PNS saponins do almost the opposite job, and it is this fraction that is now in clinical trials for ischaemic stroke and unstable angina. The mechanisms span several pathways:

The clinical paradox — simultaneous haemostatic and antiplatelet activity — is mostly resolved by timing and dose. In the immediate, high-local-concentration window after wounding, dencichine dominates and bleeding is shortened. As the dose distributes and clearance proceeds, the saponin fraction takes over and pushes the system toward better local circulation and faster bruise dispersal. Yunnan Baiyao’s complex formulation, with its layered onset and its accompanying “red pill” (paohuadan) used in different clinical contexts, was empirically built around this two-phase pharmacology long before anyone understood it molecularly.

Topical Use — How It Lands in Medicated Oils and Sprays

In topical formulations, San Qi appears in three main forms:

Powdered root in spray and powder formats — Yunnan Baiyao’s classic powder and the Yunnan Baiyao Aerosol Spray both contain notoginseng powder as the principal ingredient. The aerosol form is a propylene-glycol-based suspension designed to deliver micronised root particles directly onto skin or wound surfaces, where the dencichine fraction can act locally and the saponins absorb percutaneously.

Tincture and extract in liniments — Many trauma oils sold in Hong Kong, Singapore, and Malaysia (zheng gu shui-style products, Yunnan-origin liniments, and a number of regional bone-setter formulations) include alcoholic or hydroalcoholic extracts of San Qi alongside dragon’s blood, frankincense, myrrh, safflower, and borneol. The ethanol vehicle solubilises the saponins and aids percutaneous absorption.

Plaster and patch formulations — Adhesive plasters in the Yunnan Baiyao patch line, certain Pien Tze Huang topicals, and several PRC-mainland trauma plasters incorporate San Qi extract within hydrogel or rubber-based adhesive matrices, allowing slow saponin release over 8 to 12 hours of wear.

Percutaneous absorption of the saponins is real but modest — bench studies put it in the single-digit percentage range without penetration enhancers. The dencichine fraction, being water-soluble and small, does penetrate intact skin poorly but reaches its target effectively when the skin barrier is compromised, which is precisely the wound-and-bruise context the formulations are designed for.

Clinical and Laboratory Evidence

The evidence base for San Qi in trauma applications is mixed in quality but substantial in volume:

The methodological caveats are familiar — many of the trauma trials are small, single-centre, and conducted in mainland China without blinded controls. The pharmacological rationale, however, is unusually well-mapped for a TCM herb, and the regulatory standing of Yunnan Baiyao (a Class A drug under the Chinese pharmacopoeia and a state-protected secret formula) has driven enough rigorous study that the headline mechanisms are no longer in serious dispute.

Safety, Cautions, and the Anticoagulant Question

San Qi is generally well tolerated topically and has a low rate of contact dermatitis. The systemic concerns belong to oral preparations, but they bleed (figuratively) into topical practice in two specific ways.

Anticoagulant interaction — The saponin fraction inhibits platelet aggregation. Patients on warfarin, clopidogrel, aspirin, or DOACs who use oral San Qi or Yunnan Baiyao capsules carry a measurable increase in bleeding risk, and several case reports document elevated INRs in warfarin patients adding oral notoginseng. Topical products applied to small areas of intact skin are unlikely to reach systemic concentrations that matter, but large-surface application of San Qi liniments in anticoagulated patients should be discussed with the prescribing clinician — particularly when used together with safflower-, frankincense-, and myrrh-containing trauma oils, which independently affect coagulation.

Pregnancy — Notoginseng is classified as a 活血化瘀 (blood-moving) herb and is traditionally avoided during pregnancy because of the theoretical miscarriage risk associated with this category. The evidence base in modern pharmacology is thin, but the conventional caution is to avoid both oral and large-area topical use during pregnancy.

Dencichine and neurotoxicity — Dencichine is structurally related to β-N-oxalyl-amino-L-alanine (BOAA), the neurotoxin in Lathyrus sativus (grass pea) implicated in lathyrism. The amounts present in standard San Qi preparations have not been associated with neurological harm in clinical use, but it is a reason that very high oral doses are not recommended and that the herb is not a candidate for indefinite chronic supplementation.

Allergy and contact dermatitis — Uncommon but reported. Patients with documented Araliaceae sensitivity (including ginseng allergy) should patch-test before extended use.

Where San Qi Sits in the TCM Trauma Cabinet

If you have read the rest of this pharmacology series — frankincense, myrrh, dragon’s blood, safflower, borneol, camphor — you will recognise San Qi as the one herb that does what almost none of the others do alone: stop active bleeding fast. Frankincense and myrrh dissolve stasis and reduce inflammation. Dragon’s blood does both, with an emphasis on wound surface protection. Safflower moves blood. Borneol drives the others through the skin. San Qi is the haemostat — the only major component of a Chinese trauma cabinet that can be sprinkled into an active wound and meaningfully shorten bleeding time. That is the niche it has occupied since the Ming dynasty, and the pharmacology behind it has only sharpened the case.

For anyone building a serious understanding of why Yunnan Baiyao works, why Wong To Yick and Zheng Gu Shui include notoginseng even in tiny amounts, and why this single Wenshan-grown root commands gold-grade prices, the answer keeps coming back to the dencichine–saponin partnership. One molecule stops the bleed. The others clean up the bruise. Together they do the job that a thousand years of clinical observation kept claiming was possible — and that modern pharmacology has now, finally, mostly explained.

Sources and Further Reading