Suan Zao Ren
StarZiziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. F. Chou
Traditionally used for
- Sleep
- Mood & calm
- Heart & circulation
☯ TCM Properties
Nourishes the Heart and Calms the Spirit; Nourishes Liver Blood; Astringes to Stop Sweating; Generates Fluids
Traditional Chinese Uses
Suan Zao Ren (sour jujube seed) is the primary herb in Chinese medicine for insomnia and restlessness caused by Heart and Liver Blood deficiency. It nourishes Blood, calms the mind, and mildly astringes sweating, making it especially suited for patients who feel anxious, have palpitations, experience disturbed dreams, or wake easily at night. It is one of the most frequently prescribed herbs in sleep-related formulas and is considered safe for long-term use.
Western Herbalism Properties
Used In Formulas (5)
Relationships
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Botanical Description
Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H.F.Chow (Rhamnaceae), the wild sour jujube, is a thorny deciduous shrub or small tree of dry hillsides and stony slopes in northern China, typically reaching 1 to 3 meters tall, occasionally more, with zig-zagging, twiggy branches armed with paired stipular spines, one straight and one recurved. The leaves are alternate, ovate to oblong-elliptic, 2 to 5 cm long, with finely serrate margins, three prominent longitudinal veins from the base and a glossy green upper surface. Small, fragrant, greenish-yellow flowers are borne in axillary cymes. The fruit is a small, ovoid to subglobose drupe 1 to 1.5 cm long, ripening dark reddish-brown, with a thin, slightly sour, mealy flesh enclosing a single hard, pointed stone. The flat, brown to reddish, ovate seed kernels extracted from the stones in autumn, slightly oily and about 5 to 8 mm long, constitute Suan Zao Ren in Chinese medicine.
Active Constituents
Spinosin
Flavone C-glycoside (6-C-glucosyl-2''-O-beta-D-glucosylswertisin)Concentration: One of the two assay markers used for the seed in Chinese Pharmacopoeia quality control; content varies widely with provenance and with grafted versus wild material
Spinosin is the flavonoid most consistently linked to the sedative-hypnotic action of the seed, shortening sleep latency and prolonging pentobarbital-induced sleep in rodents, with serotonergic (5-HT1A) and GABAergic signalling implicated. It was inactive against CYP3A4 in human liver microsomes, which argues against a spinosin-mediated CYP3A4 interaction.
Jujuboside A
Dammarane-type triterpene saponinConcentration: Assayed together with jujuboside B as a Pharmacopoeial quality marker for the seed
Jujuboside A is the principal saponin of the seed and contributes to sedation, with glutamatergic and GABAergic mechanisms proposed in animal work. It is poorly absorbed intact and is extensively deglycosylated by gut flora, so exposure to the aglycone jujubogenin is variable between individuals.
Jujuboside B
Dammarane-type triterpene saponinA co-occurring saponin used with jujuboside A for identity and assay. Like other saponins it is surface-active and haemolytic in vitro, which is relevant to purity and to any non-oral use, but not to normal decoction dosing.
Magnoflorine
Aporphine (quaternary benzylisoquinoline) alkaloidA quaternary alkaloid reported in the seed and in Ziziphus material generally, with anxiolytic-type activity in rodent models. Its quaternary nitrogen limits oral absorption and CNS penetration, so its contribution to the clinical effect of a decoction is uncertain.
Swertisin
Flavone C-glycosideA minor flavone C-glycoside structurally related to spinosin and reported alongside it in the seed; it is used as a secondary chemical marker rather than as a documented active principle.
Betulinic acid
Lupane-type pentacyclic triterpene acidA widely distributed triterpene acid present in Ziziphus seed and in the plant more generally, with anti-inflammatory and cytotoxic activity in vitro. There is no evidence it contributes to the hypnotic effect at decoction doses.
⚠ Drug Interactions
Benzodiazepines, Z-drugs and other CNS depressants (e.g. zolpidem, diazepam, alcohol)
Rodent work repeatedly shows that Ziziphi Spinosae Semen extract and its isolated constituents potentiate pentobarbital-induced sleep and act through GABA-A receptor signalling; a p-chlorophenylalanine insomnia model showed the extract raising brain GABA and 5-HT and upregulating GABA-A receptor alpha-1 and gamma-2 subunits. That is the same target as benzodiazepines and Z-drugs, so additive CNS depression is pharmacologically expected even though no human interaction study has been done.
Clinical note: Ask specifically about hypnotics, anxiolytics, sedating antihistamines and evening alcohol before prescribing. Warn about driving and machinery in the first week, and do not use the herb as a covert dose escalation of a sedative the patient is already taking.
CYP1A2 substrates (e.g. theophylline, clozapine, caffeine, tizanidine)
An oral rat study found that Ziziphus jujuba fruit extract altered phenacetin pharmacokinetics and increased CYP1A2 activity. That work used the fruit (Da Zao) of Ziziphus jujuba, not the spinosa-variety seed that is Suan Zao Ren, and it was not replicated in humans, so it is an extrapolation across both plant part and species variety rather than direct evidence for this drug.
Clinical note: No routine action required. If a patient is on a narrow-margin CYP1A2 substrate such as theophylline or clozapine, monitor for loss of effect rather than assuming no interaction.
Ziziphus mauritiana and other non-spinosa Ziziphus seed sold as Suan Zao Ren
Suan Zao Ren is a comparatively expensive seed drug and quality-control reviews of the material stress the need for marker-based assay precisely because seed from other Ziziphus taxa and from grafted rather than wild plants reaches the market. Seed that is not Ziziphus jujuba var. spinosa does not carry the same spinosin and jujuboside content, so a nominally correct prescription can deliver very little of the intended actives.
Clinical note: Buy from suppliers who assay spinosin and jujuboside A. If a patient reports no response at an adequate dose, suspect the material before increasing the dose.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 10–15 g | Daily | — | — | 中国药典 2020 【用法与用量】10～15g。 【性味与归经】甘、酸，平。归肝、胆、心经。 — Chinese Pharmacopoeia 2020, quoted verbatim; route and cautions preserved. Replaces a cleared category-filler value. |
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Two moist seeds that together nourish the Heart and Liver and calm the spirit, relieving insomnia and palpitations from blood deficiency.
Insomnia, palpitations and forgetfulness from Heart and Liver blood deficiency; also moistens the intestines.
Named pairing — Shi Jinmo Dui Yao (Lu Jingshan)
Nourishing Liver blood and calming the spirit combined with clearing deficiency heat and moistening, which relieves irritability and insomnia from Liver blood deficiency with heat.
Deficiency irritability with inability to sleep.
Core pair of a classical formula — Suan Zao Ren Tang, Jin Gui Yao Lue (Zhang Zhongjing)
Evidence Tier
Moderate evidence · 5 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
1
1 verified · 0 unverified
Other clinical trial
0
Observational / case report
0
In vitro / animal
3
1 verified · 2 unverified
Show 3 studies
- Neuroprotective effect of Ziziphi Spinosae Semen on rats with p-chlorophenylalanine-induced insomnia via activation of GABAA receptor
- Mechanisms Underlying the Action of Ziziphi Spinosae Semen in the Treatment of Insomnia: A Study Involving Network Pharmacology and Experimental Validation
- Effects of Ziziphus jujuba fruit extracts on cytochrome P450 (CYP1A2) activity in rats
Other / unclassified
1
1 verified · 0 unverified
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Medicinal seeds Ziziphus spinosa for insomnia: A randomized, placebo-controlled, cross-over, feasibility clinical trial
A randomised, double-blind, placebo-controlled cross-over feasibility trial in Melbourne. Twelve participants with insomnia took 2 g daily of encapsulated Ziziphus spinosa granules or placebo for four weeks each, separated by a four-week wash-out. Sleep quality on the Pittsburgh Sleep Quality Index improved significantly on the herb compared with placebo (t = -2.276, df = 10, 95% CI -3.3 to -0.04, p = 0.046), and diary measures of total sleep time, sleep efficiency and sleep onset latency improved on the herb but not on placebo; other outcomes, including the Insomnia Severity Index, did not separate. Treatment was well tolerated with only minor adverse events. The trial was powered for feasibility, not efficacy, so the PSQI result is hypothesis-generating.
Suanzaoren Formulae for Insomnia: Updated Clinical Evidence and Possible Mechanisms
A systematic review of the clinical trial literature on Suanzaoren-containing formulae for insomnia together with the preclinical mechanistic evidence. It reports generally favourable trial results but repeatedly flags the poor methodological quality, small size and high risk of bias of the underlying Chinese-language randomised trials, so the clinical evidence base for the herb in formula is weak rather than absent.
Neuroprotective effect of Ziziphi Spinosae Semen on rats with p-chlorophenylalanine-induced insomnia via activation of GABAA receptor
In rats made insomniac with p-chlorophenylalanine, an HPLC-MS-characterised Ziziphi Spinosae Semen extract improved sleep, raised brain GABA and 5-HT, lowered glutamate and dopamine, and increased expression of the GABA-A receptor alpha-1 and gamma-2 subunits in hypothalamus and hippocampus. This is the clearest mechanistic basis for expecting additive effects with benzodiazepine-site drugs.
Mechanisms Underlying the Action of Ziziphi Spinosae Semen in the Treatment of Insomnia: A Study Involving Network Pharmacology and Experimental Validation
Network pharmacology prediction followed by experimental validation in rodents, converging on serotonergic and GABAergic signalling as the main routes by which the seed shortens sleep latency. Network pharmacology is hypothesis-generating and its target lists should not be read as demonstrated human pharmacology.
Effects of Ziziphus jujuba fruit extracts on cytochrome P450 (CYP1A2) activity in rats
Rat study showing that Ziziphus jujuba fruit extracts altered the pharmacokinetics of the CYP1A2 probe phenacetin and increased CYP1A2 activity. Note the drug studied is the fruit of Ziziphus jujuba (Da Zao), not the seed of the spinosa variety that is Suan Zao Ren; it is included here only because it is the nearest available CYP evidence in this species complex.
Historical Texts
Shen Nong Ben Cao Jing
Han dynastyJin Gui Yao Lue
Han dynastyBen Cao Gang Mu
Ming dynastyReferences
- Gong L, Xie JB, Luo Y, Qiu ZD, Liu JR, Mei NJ, Chen ZY, Wang FL, et al.. Research progress of quality control for the seed of Ziziphus jujuba var. spinosa (Bunge) Hu ex H.F. Chow (Suan-Zao-Ren) and its proprietary Chinese medicines . Journal of Ethnopharmacology (2023) [DOI]
- Kuang X, She G, Ma T, Cai W, Zhao J, Liu B, Xu F. The pharmacology, pharmacokinetics, and toxicity of spinosin: A mini review . Frontiers in Pharmacology (2022) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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