Traditionally used for
- Bowel health
- Menstrual & women's health
- Sleep
- Mood & calm
- Heart & circulation
- Energy & fatigue
☯ TCM Properties
Strengthens the Spleen and Stops Diarrhea; Benefits the Kidneys and Secures Essence; Nourishes the Heart and Calms the Spirit; Astringes to Stop Vaginal Discharge
Traditional Chinese Uses
Lian Zi (lotus seed) is a neutral, sweet-astringent herb that simultaneously nourishes and consolidates. It tonifies the Spleen and Kidney, calms the Heart, and astringes to prevent abnormal leakage of body fluids. Common indications include chronic diarrhea from Spleen deficiency, spermatorrhea, excessive vaginal discharge, restlessness, palpitations, and insomnia from Heart-Kidney disharmony. Because lotus seed functions also as a food, it is one of the safest and most gentle herbs for long-term use.
Western Herbalism Properties
Relationships
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Botanical Description
Nelumbo nucifera Gaertn. (Nelumbonaceae) is a large aquatic perennial herb rooted in the mud of ponds and slow-moving waters, with a stout, creeping, jointed rhizome bearing internal air canals. The peltate leaves are emergent, held above the water on long stout petioles up to 2 meters tall; the lamina is nearly circular, 30 to 80 cm in diameter, with a waxy, water-repellent upper surface and prominently radiating veins. Flowers are solitary on long peduncles, fragrant, 15 to 25 cm across, with many pink or white petals surrounding numerous yellow stamens and a flat-topped, perforated, obconic receptacle. As the receptacle enlarges in fruit, it becomes spongy, brown and showerhead-like, with each circular pit containing a single ovoid, hard-shelled nutlet about 1 to 1.5 cm long. The mature seed (kernel) collected in autumn, with the green embryonic plumule removed or retained, constitutes Lian Zi in Chinese medicine.
Active Constituents
Starch
Storage polysaccharide (amylose and amylopectin)Concentration: the dominant component of the cotyledon by dry weight; lotus seed flour is studied primarily as a starch food matrix
The reason Lian Zi behaves as a food-grade tonic rather than a potent drug. The starch matrix carries the seed's nutritional bulk and its high energy density, and its digestibility is the property most studied in food-science work on the seed.
Seed protein
Storage proteinConcentration: about 10.6-15.9% of the seed
Together with the starch it accounts for most of the seed's mass and for the nutritional rationale behind its traditional use in weak, wasting and post-illness states.
Crude fat
Lipid (triacylglycerol)Concentration: about 1.93-2.8% of the seed
A low fat content, consistent with the seed being used as a bland strengthening food.
Potassium and calcium
MineralConcentration: the two dominant minerals of the seed's ash fraction
Inorganic constituents of the seed; a rodent study of the inorganic fraction reported hypoglycaemic activity, though this has not been reproduced in people.
Seed-coat (testa) phenolics and proanthocyanidins
Polyphenol and proanthocyanidinConcentration: concentrated in the testa, which is largely removed when the seed is dehulled for use
A phenolic-rich testa extract inhibited carbohydrate-digesting enzymes in vitro and dose-dependently lowered fasting blood glucose and the glucose area under the curve in diabetic mice. Note that the drug as dispensed is normally the dehulled cotyledon, so most of this fraction is not present in the decoction.
Neferine, liensinine and isoliensinine
Bisbenzylisoquinoline alkaloidConcentration: concentrated in the green plumule (the embryo), which is traded separately as Lian Zi Xin; commercial Lian Zi carries them only to the extent the plumule has been left in
These are the pharmacologically potent alkaloids of the lotus seed and they are not evenly distributed. They are substrates of P-glycoprotein, and neferine is demethylated by CYP3A4 and CYP2D6 to quinone methide metabolites, so their presence changes the interaction profile of the drug. Whether they are in the cup depends entirely on whether the plumule was removed, which is why Lian Zi and Lian Zi Xin are separate drugs.
⚠ Drug Interactions
P-glycoprotein substrates and inhibitors (e.g. digoxin, verapamil, ciclosporin), where the plumule has been left in the seed
Liensinine, neferine and isoliensinine were shown in transfected-cell transport work to be P-glycoprotein substrates, with MRP2 not involved; P-gp appears to govern their absorption and distribution. Separately, neferine increased rhodamine-123 uptake in drug-resistant cells to a degree comparable with verapamil and docks into human P-gp, so it also behaves as a P-gp inhibitor at experimental concentrations. Both effects require the plumule to be present, since that is where the alkaloids sit.
Clinical note: Ask the supplier whether the plumule has been removed. If a patient on digoxin or ciclosporin is taking a whole-seed preparation, treat it as a reason for ordinary vigilance about drug levels rather than an absolute contraindication. Dehulled, plumule-free Lian Zi has no established P-gp issue.
CYP3A4 and CYP2D6 substrates, where the plumule has been left in the seed
Demethylation of neferine in human liver microsomes is mediated by CYP2D6 and CYP3A4 with biphasic kinetics, and the CYP3A4-mediated route generates quinone methide metabolites that accentuate neferine's cytotoxicity. This matters for the plumule-containing preparation, not for plumule-free seed.
Clinical note: Relevant only if the plumule is present, and mainly at concentrated-extract rather than food-dose exposures. Prefer plumule-free seed in patients on narrow-therapeutic-index CYP3A4 substrates.
Oral antidiabetic drugs and insulin
Phenolic-rich lotus seed testa extracts lowered fasting blood glucose and the glucose area under the curve dose-dependently in diabetic mice, and a rodent study of the seed's inorganic fraction reported hypoglycaemic activity. Both used fractions rather than the dispensed drug. Working in the other direction, the dispensed cotyledon is largely starch, so a food-quantity dose supplies carbohydrate.
Clinical note: Do not present Lian Zi as a glucose-lowering herb. If a diabetic patient eats it in food quantities, count the carbohydrate.
Lian Zi Xin (Nelumbo nucifera plumule) prescribed or dispensed as Lian Zi
The seed and the embryo inside it are separate items in Chinese materia medica with opposite temperature and different targets, and their chemistry matches that split. Comparative analysis across eight lotus seed cultivars found alkaloid, phenolic and flavonoid profiles differing significantly between the seed flesh and the plumule as well as across cultivars. The alkaloids of the plumule carry documented cardiovascular and transporter activity that the cotyledon does not.
Clinical note: Inspect the material. Lian Zi is the pale, starchy cotyledon; Lian Zi Xin is the small, markedly bitter green embryo. If a patient reports the decoction as strikingly bitter, plumule is present.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6–15 g | Daily | — | — | 中国药典 2020 【用法与用量】6～15g。 【性味与归经】甘、涩，平。归脾、肾、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.
Both sweet and astringent, one leaning to the Spleen and the other also calming the Heart, the pair secures essence and stops diarrhea and discharge while settling the Heart-Kidney connection.
Seminal emission and spermatorrhea from Kidney deficiency.
Core pair of a classical formula — Jin Suo Gu Jing Wan, Yi Fang Ji Jie (Wang Ang)
Evidence Tier
Moderate evidence · 4 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
4
0 verified · 4 unverified
Show 4 studies
- Hypoglycemic activity in vivo and in vitro of the Lotus (Nelumbo nucifera Gaertn.) seed skin (testa) phenolic-rich extracts
- Comparison of Nutritional Quality and Functional Active Substances in Different Parts of Eight Lotus Seed Cultivars
- In vitro characterization of ABC transporters involved in the absorption and distribution of liensinine and its analogs
- Mode of Action Analyses of Neferine, a Bisbenzylisoquinoline Alkaloid of Lotus (Nelumbo nucifera) against Multidrug-Resistant Tumor Cells
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
Hypoglycemic activity in vivo and in vitro of the Lotus (Nelumbo nucifera Gaertn.) seed skin (testa) phenolic-rich extracts
Phenolic-rich extracts of the lotus seed testa were tested in vitro and in diabetic mice. The extracts inhibited carbohydrate-digesting enzymes in vitro and significantly lowered fasting blood glucose and the glucose area under the curve in a dose-dependent way in vivo. The material tested was the seed coat, which is largely removed from the dispensed drug, so the result should not be read directly onto Lian Zi as prescribed.
Comparison of Nutritional Quality and Functional Active Substances in Different Parts of Eight Lotus Seed Cultivars
Flesh and plumule of eight lotus seed cultivars were analysed for nutritional and functional constituents. Alkaloid, phenolic and flavonoid profiles differed significantly between the two parts and between cultivars, which is the analytical basis for treating Lian Zi and Lian Zi Xin as chemically distinct drugs rather than as one material.
In vitro characterization of ABC transporters involved in the absorption and distribution of liensinine and its analogs
Transport studies established that liensinine, neferine and isoliensinine, the bisbenzylisoquinoline alkaloids of the lotus seed embryo, are substrates of P-glycoprotein, while MRP2 is not involved. P-gp therefore governs their absorption and distribution, which is the pharmacokinetic basis for the transporter interactions expected of plumule-containing lotus seed preparations.
Mode of Action Analyses of Neferine, a Bisbenzylisoquinoline Alkaloid of Lotus (Nelumbo nucifera) against Multidrug-Resistant Tumor Cells
Neferine, from the green embryo of the lotus seed, was profiled against multidrug-resistant tumour cells. Rhodamine-123 uptake increased comparably to the reference P-glycoprotein inhibitor verapamil, and docking indicated neferine binds P-gp even when rhodamine-123 is pre-bound, supporting P-gp inhibition as one of its modes of action.
Historical Texts
Shen Nong Ben Cao Jing
Han dynasty, compiled by the 2nd century CEBen Cao Gang Mu
Ming dynasty, 1596References
- Muzalfa Arooj, Saira Imran, Muhammad Inam-ur-Raheem, Muhammad Shahid Riaz Rajoka, Aysha Sameen, Rabia Siddique, Amna Sahar, Shiza Tariq, Ayesha Riaz, Abid Hussain, Azhari Siddeeg, Rana Muhammad Aadil. Lotus seeds (Nelumbinis semen) as an emerging therapeutic seed: A comprehensive review . Food Science & Nutrition (2021) [DOI]
- Keshav Raj Paudel, Nisha Panth. Phytochemical Profile and Biological Activity of Nelumbo nucifera . Evidence-Based Complementary and Alternative Medicine (2015) [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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