Lotus seed

Lotus Seed (Nelumbo nucifera Gaertn.): A Comprehensive Reference

1. Identity and Botanical Classification

1.1 Taxonomy and Nomenclature

Nelumbo nucifera (Gaertn.), commonly known as lotus, sacred lotus, Indian lotus, water lily, or Chinese water lily, is an aquatic perennial crop belonging to the family Nelumbonaceae. The plant was formerly classified under Nymphaeaceae, a related but distinct family. The seeds are referred to in Latin pharmacopeial nomenclature as Nelumbinis Semen, and in traditional Chinese medicine (TCM) as Lian Zi (莲子). The seed embryo (plumule) is separately designated in TCM as Lian Zi Xin (莲子心).

N. nucifera has been cultivated as a crop in Far-East Asia for more than 3,000 years, where it was used for food and medicine and played a significant role in religious and cultural activities. Nelumbinis semen, commonly known as lotus seeds, has been used as a vegetable, functional food, and medicine for 7,000 years.

1.2 Plant Morphology and Seed Anatomy

Flowers vary in color from white to rosy and are pleasantly sweet-scented, solitary, and hermaphrodite. Flower average diameter is 10–25 cm, and it is ovoid and glabrous. Fruits, which contain seeds, are black in color and hard and ovoid and are arranged in whorls; seeds ripen and are released as a result of bending down of the pod to the water.

The fruit of this plant is an aggregate of indehiscent nutlets. Ripe nutlets are ovoid, roundish, or oblongish, up to 1.0 m long and 1.5 cm broad, with a hard, smooth, brownish or greyish-black pericarp which is faintly longitudinally striated, pedunculated, and single-seeded. Seeds fill in the ripe carpel.

The seed itself consists of several anatomical parts that are sometimes used separately in medicine: the seed coat (pericarp), the cotyledons (the edible white flesh), and the embryo (plumule or seed heart, green in color). In herbal medicine, both the whole seed and the seed embryo (called "Lian Xin") are used for different effects.

1.3 Common Forms and Preparations

Various formulations are available commercially, including powder, tincture, dried petal, seed, and leaf preparations, and combination products (e.g., in capsule form). In Chinese cuisine, lotus seeds are often added to soups, congee (rice porridge), and desserts such as tong sui (sweet soups) and mooncakes. In Indian cuisine, lotus seeds are used in curries, sweets, and snacks. They can be eaten raw, roasted, boiled, or steamed, depending on the desired texture and flavor. Lotus seeds are often ground into a fine powder or paste, which is used as a filling in pastries, dumplings, and desserts; lotus seed paste is a common ingredient in Chinese and Vietnamese sweets, such as mooncakes, steamed buns, and sticky rice cakes.

2. Nutritional Composition

Lotus seed is a rich source of lipid, protein, starch, vitamins, and minerals, as well as bioactive compounds. The seed contains 61%–62% of carbohydrates, 16%–21% of total protein, and 2.40%–3% of crude fat, with 5%–9% moisture content. These seeds are low caloric and a rich source of multiple nutrients and bioactive constituents, which make them a unique therapeutic food.

Every 100 grams of lotus seeds contain approximately 15% protein along with essential amino acids phenylalanine, tyrosine, leucine, and lysine, which fulfill important functions in muscle repair, metabolic operations, and enzyme function. Like other dicotyledonous plant seeds, lotus seeds are free from gluten protein.

One of the dominant components of carbohydrates present in lotus seed is starch. The retrograded starch or resistant starch 3 of lotus seed demonstrated strong prebiotic effects by stimulating the growth of beneficial microbes (Bifidobacteria and Lactobacillus) in the gut.

Lotus seeds offer vital minerals including phosphorus, magnesium, and potassium, along with vitamins including riboflavin and thiamine. Among vitamins, vitamin C is found in maximum concentration in the seed, alongside B vitamins (B1, B2, B6) and vitamin E. All these vitamins possess good physiological functions, antioxidant activity, and immune-boosting properties.

3. Traditional and Historical Use

3.1 Traditional Chinese Medicine (TCM)

Texts on Chinese medicine such as the Divine Husbandman's Classic of the Materia Medica state that lotus seed "primarily tonifies the middle, nourishes the spirit, and augments the power of the qi." According to Chinese Medical Herbology and Pharmacology, "the lotus and its various parts are among the most versatile herbs in Chinese herbal medicine. Every part of the plant has separate and distinct properties."

Its key characteristics according to the Chinese Herbal Medicine: Materia Medica are that it "tonifies and stabilizes the spleen, heart, and kidneys; calms the spirit." In TCM, lotus seed (Lian Zi) is classified as a tonic herb that strengthens the Spleen, stabilizes the Kidneys, and nourishes the Heart. It is used to support digestion, treat chronic diarrhea, calm anxiety, and tonify reproductive health. Lotus seed is especially noted for its ability to "secure essence" — making it a common remedy for premature ejaculation, leucorrhea, and other signs of kidney deficiency.

The embryo of lotus seeds is used in traditional Chinese medicine as Lian Zi Xin, which primarily helps to overcome nervous disorders, insomnia, and cardiovascular diseases (hypertension and arrhythmia).

Zhong Zi Wan is a popular formula in which Lian Zi is used. Fu Ke Zhong Zi Wan is used primarily to aid fertility in women by warming the uterus and strengthening the kidney yang. The variation Zhong Zi Wan has lotus seed to augment the power of the qi while helping tonify and stabilize the kidneys.

3.2 Ayurveda

Nelumbo nucifera's history in Ayurvedic literature goes back over 2,000 years. The Charaka Samhita mentions lotus seeds under the name "Padma Bija," extolling their satvic quality for mental clarity.

In Ayurveda, this plant is also used as a diuretic and anthelmintic and in the treatment of strangury, vomiting, leprosy, and skin diseases. In Ayurveda, lotus seeds (Kamal gatta) are used to pacify pitta and vata doshas, support fertility, and promote calmness.

3.3 Folk and Other Asian Traditions

All parts of N. nucifera have been used for various medicinal purposes in various systems of medicine, including folk medicines, Ayurveda, Chinese traditional medicine, and oriental medicine. The sacred lotus has been cultivated in eastern Asia for more than 3,000 years and has been used medicinally, as food, and in religious and cultural activities. The Egyptians worshipped the flowers, fruits, and sepals of the plant, commonly found along the banks of the Nile River.

Traditionally, the whole plant of lotus was used as an astringent, emollient, and diuretic. It was used in the treatment of diarrhea, tissue inflammation, and homeostasis. In traditional medicine practice, seeds are used in the treatment of tissue inflammation, cancer and skin diseases, leprosy, and as a poison antidote.

In cuisine, lotus seeds were traditionally used in sweet soups, mooncakes, and medicinal porridges, particularly among the elderly or convalescent. In many Asian cultures, the lotus flower and its seeds hold symbolic significance. The lotus flower is revered for its beauty, purity, and spiritual symbolism, and lotus seeds are often associated with fertility, prosperity, and enlightenment. Lotus seeds are also used in religious rituals and ceremonies in various Asian traditions.

4. Key Phytochemical Constituents

4.1 Overview

The bioactive constituents of lotus are mainly alkaloids and flavonoids. The responsible bioactive compounds belong to several chemical groups; mostly they are alkaloids (like dauricine, lotusine, nuciferine, liensinine, roemerine, neferine, armepavine) and flavonoids (like kaempferol, quercetin, leucocyanidin, leucodelphinidin, catechin, isoquercitrin, astragalin), glycosides (nelumboroside A, nelumboroside B, isorhamnetin glycoside, and isorhamnetin rutinoside), and triterpenoids.

Lotus seeds are rich in essential nutrients, including proteins, carbohydrates, lipids, vitamins, and minerals, and also contain bioactive compounds such as flavonoids, phenolic compounds, and alkaloids.

4.2 Alkaloids

Among the bioactive compounds found in lotus seed embryos, three bisbenzylisoquinoline alkaloids — liensinine, isoliensinine, and neferine — stand out for their diverse pharmacological activities. Neferine, liensinine, isoliensinine, nuciferine, O-nornuciferine, dehydronuciferine, pronuciferine, and roemerine are recognized as key bioactive alkaloids present in Nelumbo nucifera. Neferine, liensinine, and isoliensinine are classified as bisbenzylisoquinoline alkaloids, whereas nuciferine, O-nornuciferine, dehydronuciferine, pronuciferine, and roemerine belong to the aporphine alkaloid class.

LC-MS analysis has identified several bioactive compounds in lotus seed extract, including alkaloids (nuciferine, neferine, armepavine, and isoliensinine) and flavonoids (catechin, kaempferol, apigenin, and rutin).

The lotus seed embryo is particularly concentrated in these alkaloids. The crude extract of germinated lotus seed embryo was extracted and purified by ionic liquids pH-zone-refining countercurrent chromatography, yielding 37.3 mg liensinine, 57.7 mg isoliensinine, and 179.9 mg neferine from 1.00 g germinated lotus seed embryo.

4.3 Flavonoids

Flavonoids from lotus (Nelumbo nucifera) seed embryos were fractionated over macroporous resin chromatography into 2 main fractions, and subsequently identified by HPLC-MS². Sixteen flavonoids were identified in lotus seed embryos, including 8 flavonoid C-glycosides and 8 flavonoid O-glycosides, in which the flavonoid C-glycosides were the main flavonoids.

The major phytochemicals present in the flowers of N. nucifera are quercetin, luteolin, luteolin glucoside, kaempferol, kaempferol-3-O-glucoside, and isoquercitrin. Flavonoids are distributed across both the seed and the embryo, contributing substantially to the plant's antioxidant profile.

4.4 Other Constituents

In addition to their antitumor activity, the principal alkaloids exhibit diverse pharmacological properties, including antioxidant, astringent, emollient, diuretic, antidiabetic, antihyperlipidemic, antiaging, anti-ischemic, antiviral, anti-inflammatory, antiallergic, and hepatoprotective effects. The seeds also contain proanthocyanidins (condensed tannins), resistant starch, and functional proteins. The retrograded starch or resistant starch 3 of lotus seed demonstrated strong prebiotic effects with stimulating the growth of beneficial microbes (Bifidobacteria and Lactobacillus) in the gut. Recently, hydrolysate produced using Flavourzyme from lotus seed protein showed excellent antioxidant properties.

5. Mechanisms of Action

5.1 Antioxidant Mechanisms

Nuciferine, neferine, and liensinine exert antioxidant effects by activating the AMP-activated protein kinase/Sirtuin 1 (AMPK/SIRT1) signaling pathway, which promotes the removal of Keap1/p62 and further nuclear translocation of nuclear factor erythroid-related factor 2 (Nrf2), thereby activating downstream antioxidant enzymes.

5.2 Anti-inflammatory Mechanisms

Recent studies have highlighted the ability of lotus seed alkaloids to modulate key signaling pathways involved in cancer progression, inflammation, fibrosis, and neurodegeneration. The precise mechanisms underlying their actions include modulation of oxidative stress, inhibition of pro-inflammatory cytokines, regulation of apoptosis, and modulation of cellular metabolism.

Treatment of BV2 microglial cells with 5–20 μM nuciferine significantly decreased the secretion of LPS-induced inflammatory mediators, including TNF-α, IL-1β, and PGE2, by inhibiting IκBα phosphorylation, thus preventing the activation of NF-κB.

5.3 Neurological and Sedative Mechanisms

These compounds exhibit a wide range of pharmacological activities, including antioxidant and anti-inflammatory effects, regulation of calcium signaling and ion channels, promotion of neurogenesis, and modulation of key neurotransmitter systems, such as dopaminergic, cholinergic, and GABAergic pathways.

The sedative and anxiolytic effects of these alkaloids were confirmed through behavioral assays, including open-field, light/dark box, and pentobarbital-induced sleep tests, with effects significantly attenuated by GABA_A receptor antagonists. These findings suggest that lotus leaf alkaloids exert their central nervous system effects primarily via GABAergic and monoaminergic pathways, providing a pharmacological basis for their traditional use in promoting relaxation and improving sleep quality.

Sleep-enhancing effects via nuciferine may be mediated through regulation of GABA, glutamate, dopamine, and norepinephrine levels in blood, as well as IL-1β and TNF-α levels in brain tissue, affecting the GABAergic and serotonin nervous systems.

5.4 Cardiovascular Mechanisms

Neferine, an alkaloid from lotus seed embryos, exhibits an antihypertensive effect by inducing vasorelaxation through the eNOS/NO/sGC (endothelial nitric oxide synthase/nitric oxide/soluble guanylyl cyclase) pathway and calcium antagonism. Neferine has also been shown to lower blood pressure and mitigate vascular remodeling in spontaneously hypertensive rats.

5.5 Anticancer Mechanisms

In renal cancer models, neferine treatment induces apoptotic cell death through suppression of the NF-κB signaling pathway, mediated by caspase-dependent cleavage of the p65 (RelA) subunit. In thyroid cancer, neferine demonstrates significant antitumor activity by inhibiting cell proliferation and promoting apoptosis via nuclear factor E2-associated factor 2 (Nrf2)/HO-1/NQO1 signaling modulation with 5 and 10 μM neferine. It regulates p38 MAPK/JNK1/2 pathways to modulate melanoma proliferation, apoptosis, and oxidative stress, and inhibits TGF-β signaling to induce MST1/ROS-mediated pyroptosis in lung cancer cells.

6. Scientific Evidence by Health Area

The following section separates evidence by health domain, characterizes study type and quality, and clearly identifies where evidence remains preclinical (animal or cell-based) rather than clinical (human).

6.1 Cardiovascular Health and Hypertension

Preclinical (animal) evidence: One in vivo study demonstrated that oral lotus seed extract (LSE) lowered blood pressure and improved cardiovascular morphology in L-NAME-induced hypertensive rats, alongside upregulation of aortic eNOS and increases in circulating nitrate/nitrite, with concurrent attenuation of oxidative stress markers.

A combination of low-dose LSE (2.5 mg/kg) with half-dose captopril (2.5 mg/kg) achieved comparable antihypertensive effects in animal models, suggesting a promising alternative therapeutic strategy. Nevertheless, these findings warrant confirmation in future clinical studies. A limitation of the present study is the lack of pharmacokinetic evaluation. As a result, it remains unclear whether the enhanced effects observed with the combination treatment are influenced by pharmacokinetic interactions. Additionally, the short treatment duration limits the ability to assess long-term efficacy. While the findings suggest promising antihypertensive effects of LSE, their applicability to human hypertension remains to be established.

Evidence strength: Preclinical only. No robust human clinical trials establishing efficacy for hypertension management have been identified in the literature reviewed.

6.2 Nervous System: Sleep and Anxiety

Preclinical evidence: Oral administration of ethanolic lotus leaf extract was shown to increase sleep time in a pentobarbital-induced sleep model. In addition, as the dose of the ethanolic lotus leaf extract increased, duration of REM sleep decreased and that of NREM sleep increased. The mouse dosages of 150 mg/kg and 300 mg/kg are estimated to correspond to human dosages of 12 mg/kg and 24 mg/kg, respectively, based on human equivalent dose calculation.

One study comparing sleep-enhancing effects of extracts from different parts of the lotus plant (lotus leaf, lotus seed, lotus plumule) found that nuciferine has sleep-promoting effects, which significantly reduce the number of automatic activities in mice, and significantly shorten sleep latency and prolong sleep duration in mice induced by chloral hydrate.

Some animal studies suggest that certain bioactive compounds in lotus seed, such as alkaloids and flavonoids, may influence neurotransmitter systems related to sleep regulation (such as GABAergic pathways). However, these findings are preliminary, mostly from preclinical research, and robust human clinical trials are lacking.

To date, 51 lotus alkaloids have been isolated; however, only a limited number have been assessed for their neuroprotective properties.

Evidence strength: Predominantly animal and cell-based. The GABAergic mechanism is mechanistically coherent with traditional sedative use, but no high-quality human randomized controlled trials (RCTs) on sleep or anxiety have been published as of the sources reviewed.

6.3 Anticancer Activity

Preclinical (in vitro and animal) evidence: Neferine has been investigated as a dual inducer of apoptosis and autophagy through ROS activation in cervical cancer cells. Neferine and N. nucifera extract suppressed the cell viability of HeLa and SiHa cells in a dose-dependent manner. Importantly, neferine showed minimal toxicity to normal cells. Furthermore, neferine inhibited anchorage-independent growth, colony formation, and migration ability of cervical cancer cells.

One study investigated the anticancer effects of lotus seed extracts — particularly the methanolic extract — on cell proliferation inhibition, apoptosis induction, and cell cycle arrest in ovarian cancer cell lines. The in vitro study demonstrated significant inhibition of SKOV3 (IC₅₀: 79.73 ± 0.91), A2780 (IC₅₀: 100.18 ± 2.42), SKOV3-CisR (IC₅₀: 115.87 ± 2.2), and A2780-CisR (IC₅₀: 138.86 ± 2.46) cells by the methanolic extract.

The embryos of lotus seeds are consumed in beverages in some parts of the world for their presumed health-benefiting effects. One study examined antitumor activity of neferine in osteosarcoma cells; the up-regulation of p21 by neferine was due to an increase in the half-life of p21 protein. P38 MAPK and JNK were activated by neferine. The results showed a direct antitumor effect of neferine, suggesting that consumption of neferine may have cancer-preventive and cancer-therapeutic benefit.

Evidence strength: In vitro and animal models only. No human clinical cancer trials have been conducted with lotus seed extracts or isolated alkaloids. Results from cell culture studies should not be extrapolated to clinical outcomes.

6.4 Neuroprotection and Cognitive Function

Research summarizes current findings on the mechanisms by which lotus-derived alkaloids, particularly neferine, nuciferine, liensinine, and isoliensinine, protect neural tissues. These compounds exhibit a wide range of pharmacological activities, including antioxidant and anti-inflammatory effects, regulation of calcium signaling and ion channels, promotion of neurogenesis, and modulation of key neurotransmitter systems, such as dopaminergic, cholinergic, and GABAergic pathways.

Extractions of N. nucifera were analyzed for their bioactive constituents, antioxidant and anti-AD properties as key enzyme inhibitory activities toward acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and β-secretase 1 (BACE-1). Results showed that the sacred lotus stamen exhibited significant amounts of phenolics, including phenolic acids and flavonoids, that contributed to high antioxidant activity.

One study found that neferine, a major alkaloid from lotus seed embryos, significantly improved cognitive function in a scopolamine-induced amnesia mouse model. The effects were linked to moderate inhibition of cholinesterases and BACE1 (an Alzheimer's-related enzyme) and strong antioxidant radical scavenging.

Evidence strength: All evidence is preclinical (cell-based and animal). The cholinesterase-inhibitory and Nrf2-activating mechanisms are scientifically plausible, but translation to human neuroprotective or anti-Alzheimer's effects remains to be demonstrated in clinical trials.

6.5 Antidiabetic and Metabolic Effects

Network pharmacology studies describe the relationship between lotus seeds and the therapeutic potential towards Type II Diabetes Mellitus. Lotus seed compounds had a therapeutic effect in atherosclerosis and Type II diabetes with multiple targets like PPARα, INSR, HMGCR, NPC1L1, ADRB1, and ADRB2.

Neferine has been reported to exhibit antioxidant, anti-inflammatory, antithrombotic, antidiabetic, cardioprotective, and antitumor properties. Lotus seed skin extracts have demonstrated alpha-glucosidase inhibitory activity in preclinical studies, suggesting a possible additive hypoglycemic effect if consumed in large amounts alongside diabetes medications.

Evidence strength: Preclinical and computational (network pharmacology). Human clinical evidence for antidiabetic effects is absent in the sources reviewed.

6.6 Gastrointestinal and Prebiotic Effects

One of the dominant components of carbohydrates present in lotus seed is starch. The retrograded starch or resistant starch 3 of lotus seed demonstrated strong prebiotic effects with stimulating the growth of beneficial microbes (Bifidobacteria and Lactobacillus) in the gut. This represents a plausible, food-science-based mechanism for the traditional use of lotus seed in managing diarrhea and digestive complaints — its resistant starch content can selectively feed beneficial gut bacteria and bulk stool consistency.

Evidence strength: In vitro / preclinical gut fermentation models. No human gut microbiome RCTs focused on lotus seed have been identified.

6.7 Hepatoprotective Effects

Protective effects of lotus (Nelumbo nucifera Gaertn.) germ oil against carbon tetrachloride-induced injury in mice and cultured PC-12 cells have been documented in the literature. More broadly, the principal alkaloids exhibit hepatoprotective effects.

Evidence strength: Animal studies only.

6.8 Antiseizure and Neuroprotective Effects of Neferine

One study evaluated the possible anti-seizure and neuroprotective effects of neferine in a kainic acid (KA)-induced seizure rat model. Rats were intraperitoneally administered neferine (10 and 50 mg/kg) 30 minutes before KA injection (15 mg/kg, i.p.).

Evidence strength: Animal model only. No human clinical evidence for antiseizure effects exists.

7. Dosage Forms and Dosages Reported in Research

No standardized human clinical dosing guidelines from regulatory or pharmacopeial sources were identified in the reviewed literature for lotus seed as a dietary supplement. The following dosages reflect what has been reported in specific research contexts:

• In a rodent seizure model, rats were administered neferine intraperitoneally at 10 and 50 mg/kg, 30 minutes before kainic acid injection.
• In a rat hypertension model, lotus seed extract (LSE) was used at 2.5 mg/kg (low dose), and a half-dose combination with captopril at 2.5 mg/kg each was also tested.
• In a murine sleep model, lotus extract was administered at 150 mg/kg and 300 mg/kg, estimated to correspond to approximately 12 mg/kg and 24 mg/kg in humans based on equivalent dose calculations.
• In a human study specifically examining doping risk, participants consumed 0.8 g of lotus plumule three times daily for three consecutive days (equivalent to 679.6 μg of higenamine per dose).
• In vitro studies of neferine in thyroid cancer models have used concentrations of 5 and 10 μM.

Reviews highlight several pharmacological and phytochemical studies that have demonstrated the therapeutic potential of lotus seeds; still, there is a need to work on some potentials to understand their mechanism of action and on clinical studies based on human volunteers to provide evidence-based therapeutics.

8. Body Systems and Health Areas Associated with Lotus Seed

Bioactive compounds from lotus seeds have been studied in connection with anti-adipogenic, antioxidant, antitumor, cardiovascular, hepatoprotective, anti-inflammatory, anti-microbial, anti-viral, and hypoglycemic activities. The primary body systems documented in the research literature include:

• Cardiovascular system: Blood pressure regulation via eNOS/NO signaling; inhibition of vascular smooth muscle cell proliferation; anti-atherogenic potential.
• Central nervous system: GABAergic sedation; monoaminergic anxiolysis; cholinergic and BACE-1 inhibition relevant to neurodegeneration; seizure models.
• Gastrointestinal system: Traditional use for diarrhea; resistant starch as prebiotic substrate; astringent properties of tannins.
• Endocrine/metabolic system: Alpha-glucosidase inhibition; PPARα and insulin receptor engagement in network pharmacology models.
• Hepatic system: Protection against chemically induced liver injury in animal models.
• Oncological (preclinical): Pro-apoptotic, anti-proliferative, and autophagy-inducing activity across multiple cancer cell lines.
• Reproductive system: Traditional use for tonic and astringent support of kidney/reproductive functions in TCM; anti-fertility effects also noted at high doses in preclinical models.
• Integumentary system (skin): Studies indicate that lotus seeds have a role in skin protection, care, and are widely used as anti-wrinkle and whitening agents.

9. Safety Considerations and Interactions

9.1 General Safety Profile

Boiling water extracts of lotus seeds neither generated lipid peroxidation nor cytotoxicity for human lymphocytes, indicating that the safety of lotus seed extract is relatively high in different cells and animal models. Modern toxicological research proposed that the total alkaloids in lotus plumula exhibited no organ toxicity in rats at 400 mg/kg and had a maximum tolerated dose of 5,000 mg/kg in mice in long-term toxicity tests.

In silico safety evaluation of neferine presented a positive toxicity profile, predicting no mutagenicity for neferine. Lotus leaf extract (2 g/kg) also failed to show adverse effects or toxicity in blood cells, and did not affect liver enzymes or kidney function, thereby confirming the safety of lotus plant in rats.

9.2 Higenamine and Doping Risk

A notable safety consideration arises for competitive athletes. In a human study, participants (n = 6) consumed 0.8 g of lotus plumule (equivalent to 679.6 μg of higenamine) three times daily for three consecutive days. All participants' urinary higenamine concentrations exceeded the WADA reporting cut-off of 10.0 ng/mL. Accordingly, lotus plumule consumption may engender adverse analytical findings regarding higenamine. Consumption of lotus plumule products was shown to produce higenamine levels that reached the "adverse analytical findings" criterion for doping according to the World Anti-Doping Agency. Within 3 hours of consuming lotus plumule extract powder containing 679.6 mcg of higenamine per dose, urine specimens in 4 of 6 participants reached the positivity criterion of 10 ng/mL. Urinary concentrations of higenamine increased over the 3-day regimen.

9.3 Potential Drug Interactions

Due to potential for drug interactions, sacred lotus should be used cautiously in individuals receiving treatment for diabetes, high cholesterol, psychiatric or cardiac conditions, or erectile dysfunction.

Specifically, the following preclinical interaction signals have been identified:

• If lotus heart (Lian Zi Xin) is retained in the preparation, its alkaloids (neferine, liensinine) have documented hypotensive and antiarrhythmic effects in animal studies, warranting caution with antihypertensive or cardiac medications.
• Lotus seed skin extracts have demonstrated alpha-glucosidase inhibitory activity in preclinical studies, suggesting a possible additive hypoglycemic effect if consumed in large amounts alongside diabetes medications.
• Lotus seeds contain GABA and compounds that may promote sleep through GABA-A receptor activity, which could theoretically enhance the effects of benzodiazepines or other sedatives.

9.4 Allergenic Potential

Allergic reactions to N. nucifera products, while considered rare, have been documented; an allergenic protein was identified in lotus root (N. nucifera rhizome), flagged in an immunological case report (Hiraguchi et al., 2018, cited in Drugs.com/Wiley sources). Skin-contact reactions have been anecdotally noted with topical preparations.

9.5 Pregnancy and Lactation

Information regarding safety and efficacy in pregnancy and lactation is lacking. No evidence-based safety data for lotus seed supplementation during pregnancy or breastfeeding could be identified in the sources reviewed.

9.6 Gaps and Research Limitations

Reviews highlight several pharmacological and phytochemical studies that have demonstrated the therapeutic potential of lotus seeds. Still, there is a need to work on some potentials to understand their mechanism of action and on clinical studies based on human volunteers to provide evidence-based therapeutics. The vast majority of pharmacological evidence remains in preclinical (cell and animal) models, and rigorous human clinical trials across all studied health areas are largely absent from the current scientific record.

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