Bai Zi Ren
StarPlatycladus orientalis (L.) Franco
Traditionally used for
- Bowel health
- Sleep
- Mood & calm
- Heart & circulation
☯ TCM Properties
Nourishes the Heart and Calms the Spirit; Moistens the Intestines and Unblocks the Bowels; Astringes to Stop Sweating
Traditional Chinese Uses
Bai Zi Ren (arborvitae seed, biota seed) is a gentle, oily, neutral herb that nourishes Blood, calms the Spirit, and moistens the Intestines. It is the gentlest of the Heart-calming herbs, suitable for insomnia, anxious dreams, and palpitations in Blood-deficient patients without significant heat. Its moisture-rich content also relieves constipation from intestinal dryness and deficiency. It is often used alongside suan zao ren (sour jujube seed) for complementary sleep-support action.
Used In Formulas (2)
Relationships
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Botanical Description
Platycladus orientalis, the Chinese arborvitae, is an evergreen coniferous tree in the family Cupressaceae, native to northern and northeastern China, Korea, and the Russian Far East, and widely planted across temperate Asia. Mature trees reach 15-20 m tall with a dense, conical to broadly rounded crown and reddish-brown, fibrous bark that exfoliates in vertical strips. The branchlets are flattened into vertical, fan-like sprays clothed in tiny, scale-like, decussate leaves that are bright green and aromatic when crushed. The plant is monoecious, bearing small yellowish male cones and bluish-green female cones at the branch tips. The female cones mature in a single season into ovoid, fleshy, glaucous structures 1.5-2.5 cm long bearing prominent recurved horn-like processes on each scale, opening at maturity to release wingless or narrowly winged ovoid seeds. The seed (Bai Zi Ren) is the medicinal part, collected in autumn.
Active Constituents
Fatty oil (triacylglycerols of linoleic, linolenic, oleic, palmitic and stearic acids)
Fixed oil / triacylglycerolsConcentration: the dominant fraction of the kernel; eleven fatty acid derivatives were identified in the methyl-esterified fatty oil of Platycladi Semen
The bulk lipid fraction is the pharmacological basis of the traditional claim that the seed moistens the intestines and unblocks the bowels, working as a lubricant laxative rather than a stimulant one. It is also why loose stools are the expected dose-limiting effect, and why a defatted preparation (Bai Zi Ren Shuang) exists for patients who cannot tolerate that.
Pinusolide
Labdane diterpene lactoneConcentration: one of the two dominant diterpenoids of the seed n-hexane extract, tentatively 16.08% of that fraction
A selective platelet-activating-factor receptor antagonist. It inhibits PAF-induced rabbit platelet aggregation and serotonin release with an IC50 near 5 µM while having no effect on aggregation induced by ADP, collagen or thrombin, so its antiplatelet action is narrow rather than general. Note that its pharmacology was worked out in leaf material of the same species, and its presence in the seed comes from essential-oil profiling of Semen Platycladi.
Vulgarol A
Diterpene alcoholConcentration: the major diterpenoid of the seed n-hexane extract, tentatively 16.72% of that fraction
The most abundant single diterpenoid reported in the lipophilic extract of the seed. Its own pharmacology is not established, and it should be treated as a chemical marker of the drug rather than as an active principle.
Cedrol
Sesquiterpene alcoholA volatile constituent of the seed oil, and one of the components usually invoked when the sedative and hypnotic activity of Semen Platycladi essential oil is discussed. The sedative evidence is from animal and in vitro work on the whole oil, not from cedrol given alone in people.
alpha-Pinene, sabinene, 3-carene and limonene
Monoterpene hydrocarbonsThe principal volatile monoterpenes of Semen Platycladi essential oil, which carry the antioxidant and antimicrobial activity measured for the oil in vitro. They are not the constituents responsible for the herb's traditional calming or bowel-moistening use.
Phytosterols
SterolsPlant sterols were among the forty-one compounds identified by UFLC-QTOF-MS/MS in the antidepressant-active seed extract, alongside fatty acids, terpenoids, amino acids and flavonoids. They are reported as a constituent class; no specific sterol has been shown to drive the extract's activity.
⚠ Drug Interactions
Sedative-hypnotics, benzodiazepines and other CNS depressants
Both the aqueous extract and the fatty oil of Platycladi Semen produce anxiolytic effects in stressed mice, and the essential oil is reported to have sedative and hypnotic activity. The evidence is animal and in vitro; no human study has measured additive sedation with a prescribed hypnotic. The plausible additive effect is therefore real enough to warn about but not quantified.
Clinical note: Warn patients taking a hypnotic, benzodiazepine or sedating antihistamine that drowsiness may be increased, particularly in the first week and where the herb is given in a sleep formula at night.
MAO inhibitors, SSRIs and SNRIs
A seed extract of Platycladus orientalis behaved as a potential triple-reuptake and MAO inhibitor in a chronic unpredictable mild stress rat model, correlating with 5-HT reuptake inhibitors, adrenaline agonists and dopamine agonists in docking analysis and altering 5-HT, noradrenaline and dopamine in the prefrontal cortex and dorsal raphe. That is a rat-extract finding with no human pharmacokinetic or pharmacodynamic follow-up, so the interaction is a mechanistic inference, not an observed event.
Clinical note: No specific avoidance is warranted on this evidence, but if a patient on an MAOI or a serotonergic antidepressant develops agitation, tremor or hyperthermia, include the herb in the differential rather than dismissing it.
Antiplatelet and anticoagulant drugs
Pinusolide, a diterpene reported among the dominant diterpenoids of the seed extract, is a specific platelet-activating-factor receptor antagonist: it blocks PAF-induced aggregation at around 5 µM but leaves ADP-, collagen- and thrombin-induced aggregation untouched. Because aspirin, clopidogrel and warfarin act on entirely different pathways, an additive bleeding effect is not the expected result, and no bleeding case has been reported with Bai Zi Ren. The honest position is that the mechanism exists but the clinical interaction has not been demonstrated.
Clinical note: No routine restriction. Do not present this as an established bleeding interaction to patients, which would misrepresent the evidence.
Laxatives, stool softeners and osmotic agents
The kernel is dominated by fixed oil, and its bowel-moistening action is a straightforward lubricant effect. Adding it to another laxative simply adds to that. This is also the reason the classical cautions place the herb off-limits in patients who already have loose stools or copious phlegm.
Clinical note: Reduce the dose or use the defatted preparation (Bai Zi Ren Shuang) in patients on laxatives or with a tendency to loose stools.
Ce Bai Ye (Platycladi Cacumen), the leafy twig of the same species
Platycladus orientalis yields two separate Pharmacopoeia drugs, the seed kernel (Bai Zi Ren, Platycladi Semen) and the leafy twig (Ce Bai Ye, Platycladi Cacumen), and the great majority of the published phytochemistry and pharmacology for this species, including the PAF-antagonist diterpene work, was done on leaves rather than seed. Their indications do not overlap: the leaf is used to cool blood and stop bleeding, the seed to nourish the Heart and moisten the intestines. Treating leaf data as seed data, or accepting one for the other in a prescription, changes the drug.
Clinical note: Confirm which part has been supplied. When reading research on this species, check the plant part before applying it to Bai Zi Ren, because most of it is leaf work.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 3–10 g | Daily | — | — | 中国药典 2020 【用法与用量】3～10g。 【性味与归经】甘，平。归心、肾、大肠经。 — 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)
Evidence Tier
Limited evidence · 2 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
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
2
1 verified · 1 unverified
Show 2 studies
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Platycladus orientalis seed extract as a potential triple reuptake MAO inhibitor rescue depression phenotype through restoring monoamine neurotransmitters
Forty-one compounds were identified in the active seed extract (S4), including fatty acids, terpenoids, amino acids, plant sterols and flavonoids. S4 increased total rest time and reduced waking activity in zebrafish, and in chronic unpredictable mild stress rats it reversed the loss of sucrose preference and the increased immobility in tail-suspension and forced-swimming tests, while restoring 5-HT, noradrenaline and dopamine levels in the prefrontal cortex and dorsal raphe nucleus. This is the strongest experimental support for the traditional calming indication, but it is a rat and zebrafish study, not a human trial. A corrigendum to this paper was published in 2024.
Comparative antioxidant, anticancer and antimicrobial activities of essential oils from Semen Platycladi by different extraction methods
Essential oils prepared from Semen Platycladi by different extraction methods were profiled and tested. The n-hexane extract was dominated by diterpenoids, with vulgarol A and pinusolide the two most abundant tentatively identified diterpenoids, and the oils showed antioxidant, antimicrobial and cell-line cytotoxic activity that varied with extraction method. It is a laboratory characterisation of the seed's lipophilic fraction, with no bearing on clinical dosing.
Historical Texts
Shen Nong Ben Cao Jing
Han dynastyBen Cao Gang Mu
Ming dynasty (1596)References
- Inoue M, Hasegawa S, Hirose Y. Terpenoids from the seed of platycladus orientalis . Phytochemistry (1985) [DOI]
- Shan MQ, Shang J, Ding AW. Platycladus orientalis Leaves: A Systemic Review on Botany, Phytochemistry and Pharmacology . The American Journal of Chinese Medicine (2014) [DOI]
- Kim KA, Moon TC, Lee SW, Chung KC, Han BH, Chang HW. Pinusolide from the Leaves of Biota orientalis as Potent Platelet Activating Factor Antagonist . Planta Medica (1999) [DOI]
- Yang HO, Kang YH, Suh DY, Kim YC, Han BH. Biological and Pharmacological Effects of Pinusolide, a Novel Platelet Activating Factor Antagonist . Planta Medica (1995) [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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