Solomon's Seal (Polygonatum spp.): A Comprehensive Reference
1. Identity and Botanical Overview
1.1 Taxonomy and Species
Solomon's seal is the common name applied to members of the genus Polygonatum Mill.,
a genus within the family Asparagaceae (historically Liliaceae) comprising 71 species and 4 varieties distributed throughout the temperate Northern Hemisphere.
It is a perennial herbaceous plant with approximately 40 species worldwide and a widespread distribution in the northern temperate zone; 31 species are found in China, mainly concentrated in Sichuan, Yunnan, Gansu, Shanxi, Jilin, Heilongjiang, Hebei, and other provinces.
The medicinally relevant species vary significantly by region and tradition. The most commercially and pharmacologically studied species include:
- Polygonatum multiflorum (L.) All. — Eurasian Solomon's seal, native to Europe and temperate Asia; the primary species in European herbal traditions.
- Polygonatum odoratum (Mill.) Druce — Angular or scented Solomon's seal; known in Traditional Chinese Medicine (TCM) as Yuzhu (Rhizoma Polygonati Odorati).
Its rhizomes are used in China as a traditional Chinese medicine, as vegetables, foods, functional foods, or tea, with a history of application for more than 2,000 years.
- Polygonatum sibiricum Redouté — Siberian Solomon's seal; known in TCM as part of the Huangjing complex (Rhizoma Polygonati), along with P. kingianum and P. cyrtonema. Polygonatum sibiricum, also known as tendril leaf or Solomon's seal rhizome, is derived from the dried rhizome of Polygonatum kingianum, Polygonatum sp., or Polygonatum cyrtonema of the family Liliaceae.
- Polygonatum biflorum (Walter) Elliott — Smooth Solomon's seal; a perennial herbaceous plant native to North America, where Indigenous peoples have utilized its various parts for centuries.
- Polygonatum verticillatum (L.) All. — Whorled Solomon's seal; used in Ayurvedic and South Asian traditional medicine.
- Polygonatum kingianum Collett & Hemsl. and Polygonatum cyrtonema Hua — Both included under the TCM Huangjing designation and the subject of substantial recent pharmacological research.
At least 37 species and 1 variety of Polygonatum plants have been used as traditional medicine and functional food.
1.2 Botanical Characteristics
Polygonatum plants have simple alternate, opposite, or whorled leaves. The flowers are bisexual with a superior ovary, axial placenta, and capsule or berry. These plants prefer to grow in forest margins, shrubland, and grassy areas with fertile soil and adequate moisture.
This perennial stands one to three feet high at maturity, producing small, white, and bell-shaped flowers and dark purple fruits that hang from the leaf axils largely in pairs.
1.3 Common Names and Synonyms
Common names include Eurasian Solomon's seal (P. multiflorum), Huangjing (P. sibiricum and P. kingianum), King Solomon's seal, Rhizoma polygonati, Solomon's seal, and Yuzhu (P. odoratum).
The plant's common name, Solomon's Seal, is believed to be derived from the scars left on the rhizomes after the leaves drop, resembling the seal of King Solomon.
Additional traditional names include Lady's Seal, St. Mary's Seal, Sealroot, and Sealwort.
1.4 The Medicinal Part
The primary medicinal part is the rhizome (underground horizontal stem).
In addition to use of the rhizomes in cooking, teas, and wine, the seeds, leaves, or whole plants of some species are also used medicinally and as functional foods.
The dried rhizomes of Polygonatum sibiricum Delar. ex Redoute and Polygonatum odoratum (Mill.) Druce have beneficial effects in nourishing Yin and moisturizing the lung, promoting fluid production to quench thirst, and have a long history of medicinal application and a long-standing reputation in China and abroad.
In the PRC Pharmacopoeia (2000), Polygonatum odoratum is an official plant species for Yuzhu (Rhizoma Polygonati Odorati).
The criterion of quality control for Yuzhu, according to the PRC Pharmacopoeia, is the polysaccharide content; the content of polysaccharide is based on the glucose content (not less than 6% of its dry weight) by sulfuric-phenol methods.
1.5 Common Dosage Forms and Preparations
In traditional herbal medicine, Solomon's Seal rhizomes are often prepared as teas, tinctures, or decoctions for internal use, or as ointments for topical application.
Dried rhizomes can be ground into a fine powder, making them suitable for various medicinal preparations.
P. odoratum is also used as vegetables, foods, functional foods, or tea.
It was used as a primary food during the Eastern Jin Dynasty, as its root part was abundant in starch.
Contemporary commercial forms include standardized dry extracts, fluid extracts, capsules, tablets, and topical preparations (creams, salves). The rhizome is also employed in wine infusions and congee preparations within TCM food therapy.
2. Traditional and Historical Use
2.1 Traditional Chinese Medicine
In China, the first recorded use of Yuzhu might go back to the "Shen'nong Bencaojing" of the first century AD.
Historical texts such as the "Shennong Bencao Jing" (Divine Farmer's Materia Medica) document Polygonatum as a tonic for enhancing vitality, nourishing Yin, and supporting the lungs and kidneys.
Polygonatum is known in TCM for its pharmacological effects including qi tonification, yin nourishment, spleen invigoration, lung moistening, and kidney tonification.
It is considered a Yin tonic and is thought to be particularly applicable to problems affecting the digestive, respiratory, and cardiovascular systems.
As traditional medicinal food homology plants, P. sibiricum and P. odoratum not only have a sweet fragrance and taste but also have tonic effects. P. sibiricum is also known as the "immortal surplus grain" and "mipu."
Healers have long used Polygonatum in remedies to alleviate conditions such as dry coughs, fatigue, joint pain, and digestive disturbances.
Traditionally, it has been incorporated into teas, soups, and various herbal formulations, attributed with benefits such as boosting immunity, alleviating fatigue, and promoting longevity.
The rhizome of P. odoratum is recorded as "Yuzhu," whereas the rhizomes of P. sibiricum, P. kingianum, and P. cyrtonema are collectively referred to as "Huangjing." As typical yin-nourishing medicinal materials, these herbs exert anti-senescence effects and are widely applied for the management of osteoporosis, general debility, physical fatigue, diabetes, and pulmonary diseases.
The use of Polygonatum odoratum traditionally focused on supporting the body's physical structure, particularly tendons, ligaments, and joints. In TCM, preparations from the rhizome were often prescribed for conditions involving backache, joint discomfort, and general body aches, based on the herb's reputed ability to strengthen bones and sinews.
2.2 Traditional Use Across Other Asian Systems
In Iranian traditional medicine, the rhizome of P. orientale is used to treat kidney stones, gout, rheumatism, diabetes, and gynecological and internal wounds.
The rhizomes of P. falcatum in southeast Asia, P. odoratum var. pluriflorum in Korea and Japan, P. verticillatum in Pakistan, P. multiflorum in Europe, and P. biflorum in North America have also been used as traditional medicine.
P. verticillatum also exhibits emollient and antifungal activities and is used in the preparation of cosmetics as a skin tonic.
2.3 North American Indigenous Use
Numerous eastern North American tribes, including the Cherokee, Chippewa, Iroquois, and Menominee, used plants of the genus as an analgesic or stimulant, or as a dermatological, cathartic, gynecological, and gastrointestinal aid (Moerman, 1986).
Historically, the Native Americans consumed the starch-rich rhizomes of smooth Solomon's seal as a "potato-like food" used to make breads and soups.
Smooth Solomon's seal was also used in herbal medicine. For example, the rhizome was used in making a tonic for gout and rheumatism. It has had nearly a dozen uses in herbal medicine including as an anti-inflammatory, sedative, and tonic.
2.4 European Herbal Traditions
The medicinal history of Polygonatum biflorum can be traced back to Indigenous tribes such as the Cherokee and Ojibwa, who recognized its healing potential. Early European settlers also adopted its use, contributing to its inclusion in Western herbal traditions.
In European herbalism, P. multiflorum was historically used for bruises, wounds, and skin conditions. Solomon's seal has traditionally been used to treat lung disorders, reduce swelling (inflammation), and dry out tissue as an astringent. Some people apply it directly to the skin for bruises, ulcers, or boils on the fingers, hemorrhoids, skin redness, and water retention (edema).
The rhizome has traditionally been used for treatment of coughing, fever, and weakness due to malaise, and for treatment of hyperlipidemia, preventing cardiovascular disease, and improvement of cardiac muscle due to the toxicity of digitalis, as well as treating paralysis due to stroke.
3. Key Constituents and Active Compounds
3.1 Overview of Phytochemical Profile
Previous phytochemical investigations confirmed that Polygonatum contains a wide range of chemical components, including saponins, polysaccharides, flavonoids, alkaloids, lignans, volatile oils, and amino acids.
A summary of 233 compounds isolated from this genus between 1977 and 2022 found 124 steroidal saponins, 68 flavonoids, triterpenoid saponins, 16 alkaloids, 3 quinones, and 6 lignans.
The major chemical constituents of Polygonatum plants are steroidal saponins, triterpenoid saponins, homoisoflavanones, polysaccharides, and lectins.
3.2 Polysaccharides
Polysaccharides are major bioactive components and contributors to the sweet taste of Polygonati Rhizoma, which mainly exert metabolic regulation, immunomodulatory, anti-fatigue, anti-aging, antiviral, anti-inflammatory, antioxidant, antiatherosclerotic, liver protection, hypolipidemic, anti-osteoporosis, anti-cancer, anti-diabetic, and anti-atherosclerotic activities.
Polysaccharides also serve as evaluation markers in quality control of Polygonati Rhizoma and "Yuzhu" (P. odoratum).
The main polysaccharide components are galactan and mannan, which are linked by an alpha glycosidic (1,4) or a 1–6 glycosidic bond.
3.3 Steroidal Saponins
Characterized by an oxidized squalene skeleton linked to sugar moieties, Polygonatum saponins predominantly encompass steroidal saponins, with a smaller fraction comprising triterpene saponins. Steroidal saponins, further classified into furostane-type and helicosteroid-type, exhibit notable bioactivities including immunomodulation and cognitive enhancement.
Active substances from the extracts of Polygonati odorati Rhizoma include saponin, flavonoids, and steroidal glycosides, which have been shown experimentally to reduce blood glucose and improve insulin resistance in animal models.
Chemical studies have identified five types of diosgenin molecules in P. multiflorum. Diosgenin is a steroidal saponin present in wild yam and fenugreek, which appears to have benefits in menopause, diabetes, and various ailments of aging, including osteoporosis, cancer, and cardiovascular diseases.
3.4 Flavonoids and Homoisoflavanones
Modern pharmacological and phytochemical studies have demonstrated that Polygonatum species have abundant bioactive chemical constituents, including flavonoids. To date, 93 flavonoids have been isolated and characterized from this genus. These flavonoids exhibit a broad spectrum of pharmacological activities, including antioxidant, anti-diabetic, anticancer, anti-inflammatory, and antibacterial effects.
The main active ingredients of P. odoratum are presumed to be homoisoflavanones, polysaccharides, saponins, and lectins, with pharmacological effects including antitumor, anticancer, antioxidant, delayed aging activity, slowing senescence, relieving fatigue, and immune regulation.
3.5 Alkaloids and Other Compounds
Researchers have isolated and identified Polygonatum's composition as polysaccharides, flavonoids, saponins, alkaloids, lignans, and many other types of chemical constituents.
Emodin, a constituent in P. multiflorum, is an anthraquinone with hepatoprotective, anti-inflammatory, antibacterial, and anticancer as well as likely antiviral effects.
Tetrahydroxystilbene glucoside (TSG) is another notable constituent of P. multiflorum.
3.6 Lectins
Most of the pharmacological effects of this genus can be attributed to its polysaccharides, saponins, and lectins.
Lectins isolated from Polygonatum species have been studied in vitro for their immunomodulatory potential, though their contribution to oral preparations is less well characterized because proteins are typically degraded during digestion.
4. Mechanisms of Action
4.1 Antioxidant and Anti-Aging Mechanisms
Serving as an antioxidant, Polygonati Rhizoma polysaccharides can delay senescence and be used as an immunostimulant agent for protection against immunosuppression.
PSP (polysaccharides from P. sibiricum) attenuates diabetes by decreasing reactive oxygen species (ROS) production and malondialdehyde (MDA) levels, and augmenting superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities. PSP also scavenged the activation of the Nrf2/HO-1 pathway in HG-induced cells. Moreover, PSP significantly regulated apoptosis by diminishing Bax and caspase-3 expression, and promoting Bcl-2 production.
4.2 Immunomodulatory Mechanisms
Polygonati Rhizoma possesses remarkable anti-fatigue, anti-aging, metabolic regulatory, immunomodulatory, anti-inflammatory, neuroprotective, anti-diabetes, and anti-cancer effects. Among bioactive phytochemicals in Polygonati Rhizoma, polysaccharides play important roles in the health-promoting activities through the mechanisms mentioned above and through potential synergistic effects with other bioactives.
4.3 Anti-Diabetic and Glycemic Regulatory Mechanisms
Polysaccharides, saponins, flavonoids, and phenolics are the primary secondary metabolites isolated from the rhizomes of P. sibiricum, P. kingianum, or P. cyrtonema, which have attracted attention owing to their unique therapeutic role in the treatment and prevention of diabetes.
PSP has been shown to lower serum fasting blood glucose and glycated hemoglobin levels and improve glucose tolerance in mice with diabetes, and is also involved in glucose metabolism regulation.
Polysaccharides also help balance intestinal flora, regulate blood sugar, and prevent cardiovascular disease and Alzheimer's disease. These effects are mediated through various signaling pathways, such as the mitogen-activated protein kinase (MAPK), nuclear factor kappa-B (NF-κB), and nuclear factor erythroid 2-related factor 2/heme oxygenase-1 (Nrf2/HO-1) antioxidant signaling pathways.
4.4 Anti-Osteoporosis Mechanisms
PSP has been shown to have significant anti-ovariectomy-induced osteoporosis effects in vivo. In cell-based studies, PSP promoted the osteogenic differentiation of mouse bone marrow stromal cells (BMSCs) without affecting the BMP signaling pathway. This effect was due to increased nuclear accumulation of β-catenin, resulting in higher expression of osteoblast-related genes.
Furthermore, PSP could inhibit receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclastogenesis.
Thus, PSP appears to act on bone homeostasis through the Wnt/β-catenin signaling pathway, simultaneously promoting osteoblast formation and blocking osteoclastogenesis.
4.5 Cardiovascular Mechanisms
Evidence suggests that Polygonatum may exert anti-atherosclerotic effects, protect cardiomyocytes, and attenuate myocardial fibrosis, which are achieved through the inhibition of oxidative stress, modulation of inflammatory processes, and regulation of lipid metabolism pathways.
Polygonatum and its active ingredients also have anti-atherosclerotic effects in Apolipoprotein E (ApoE) gene knocked-out mice by inhibiting Toll-like receptor 4 (TLR4)-mediated activation of NF-κB.
5. Scientific Evidence by Area of Use
Important note on evidence quality: In vitro and animal studies suggest potential applications in diabetes, osteoporosis, cancer, cardiovascular risk factors, and CNS and immune disorders; however, clinical studies are lacking to recommend use for any indication. The following sections assess the available evidence honestly by domain.
5.1 Diabetes and Glycemic Regulation
Preclinical evidence: Polysaccharides, saponins, flavonoids, and other phenolics of Polygonatum have a prominent role in lowering blood sugar and blood lipids in diabetes mellitus (DM) in preclinical studies. Reported doses of Polygonatum secondary metabolites in these models range from a minimum of 25 mg/kg to a maximum of 2 g/kg.
In one in vivo study, PSP was effective in controlling polydipsia, polyuria, polyphagia, and weight loss in DM rats. With PSP, MDA content was lowered, and cataract progression was delayed.
One isolated saponin analog from P. kingianum rhizomes demonstrated potential in inhibiting advanced glycosylation end product (AGE) formation, thereby holding promise in preventing diabetic complications.
Evidence strength: Preclinical (cell and rodent model) data are substantial and mechanistically detailed. Human clinical trials in this area are currently absent. The evidence base does not support clinical recommendations.
5.2 Bone Health and Osteoporosis
Preclinical evidence: Polygonati Rhizoma polysaccharides are used to improve anti-osteoporotic fractures and enhance viability of mesenchymal stem cells in bones.
PSP promoted osteogenic differentiation of mouse BMSCs and suppressed osteoclastogenesis through increased nuclear accumulation of β-catenin and decreased expression of osteoclast-related genes; it could potentially be used to treat osteoporosis.
Modern pharmacological studies have shown that Polygonati Rhizoma has anti-osteoporosis, bone protection, neuroprotection, and immune enhancement effects.
Evidence strength: Predominantly in vitro and animal model data. No human controlled trials have been identified. Evidence is preliminary.
5.3 Cardiovascular Protection
Preclinical evidence: Animal studies suggest that Polygonatum polysaccharides may positively influence cardiovascular health. In rabbit models, these polysaccharides modulated cholesterol levels, including total cholesterol and LDL, without affecting triglycerides or HDL. Additionally, in rats with induced heart failure, P. sibiricum polysaccharides improved cardiac function and serum biochemical indices such as superoxide dismutase and nitric oxide levels.
PSP might improve diabetic cardiomyopathy in diabetes patients by reducing endoplasmic reticulum and oxidative stress, and enhancing cyclic guanosine monophosphate protein kinase G (cGMP-PKG) signaling.
Evidence strength: Animal and in vitro only. No human clinical trial data. Evidence is early-stage and preliminary.
5.4 Immunomodulation
Preclinical evidence: Polysaccharides from genus Polygonatum have immunomodulatory, anti-inflammatory, cardiovascular protective, neuroprotective, antitumor, antidiabetic, antiosteoporosis, and hepatoprotective properties.
PSPs demonstrate promising antioxidant, immunomodulatory, anti-diabetic, anti-obesity, hepatoprotective, and anti-tumoral effects.
Sulfated polysaccharide fractions from P. sibiricum have been evaluated for immune-enhancement in vitro, with results suggesting stimulation of lymphocyte proliferation and cytokine production.
Evidence strength: Predominantly preclinical. Clinical relevance is supported by evidence of improved immune response, glucose regulation, and lipid metabolism in preclinical disease models. Human trials are lacking.
5.5 Neuroprotection and Cognitive Function
Preclinical evidence: In rats with induced Alzheimer's disease, beta-amyloid peptide accumulation was decreased with a P. sibiricum decoction, and improved learning and memory have been shown in similar studies.
An animal study demonstrated the effects of TSG (tetrahydroxystilbene glucoside, a constituent of P. multiflorum) on mice. Mice demonstrated increased lifespan, improved memory, and reduced changes in brain chemistry associated with aging.
A water extract of the P. sibiricum rhizome exhibited gamma-aminobutyric acid (GABA)-benzodiazepine receptor binding in rodent and drosophila models, resulting in an increase of non-REM sleep and a decrease of REM sleep.
Evidence strength: All available data are from animal and cell culture models. No human clinical trials have been published. Evidence is preliminary and largely mechanistic.
5.6 Anti-Cancer Activity
Preclinical evidence: Recent studies have identified polysaccharides, flavonoids, and saponins as the main bioactive metabolites, which exert notable antitumor effects via diverse mechanisms, including enhancement of immune responses, induction of cancer cell apoptosis, and suppression of tumor proliferation.
Bioactive metabolites in Polygonatum have shown strong cytotoxic and pro-apoptotic impacts in vitro and in vivo.
P. sibiricum extracts have shown activity against breast, cervical, and liver cancer cell lines.
Recent research primarily revolves around its anti-inflammatory, anti-ageing, and glycaemic regulatory properties, while its antitumor potential remains comparatively underexplored.
Evidence strength: Entirely in vitro and animal model data. No human oncology trials. Evidence does not support anti-cancer claims in humans.
5.7 Anti-Fatigue Effects
Preclinical evidence: Crude extracts and certain pure compounds from Polygonatum plants have shown a wide range of pharmacological effects such as anti-aging, anti-diabetic, anti-fatigue, and anticancer effects in preclinical studies.
Anti-fatigue activity is attributed primarily to the polysaccharide fraction, which supports metabolic regulation and energy metabolism.
Evidence strength: Preclinical only. Human trials are absent.
5.8 Musculoskeletal and Connective Tissue
The use of Polygonatum odoratum traditionally focused on supporting the body's physical structure, particularly tendons, ligaments, and joints. In TCM, preparations were prescribed for backache, joint discomfort, and general body aches.
Animal models suggest benefits for joint health and as an immune booster, though human trials are sparse.
Anti-inflammatory activity demonstrated in vitro — specifically the inhibition of nitric oxide, tumor necrosis factor (TNF), and interleukins in macrophage cell lines — provides a plausible mechanistic basis for these traditional uses.
Evidence strength: Traditional use is well-documented; in vitro anti-inflammatory data exist; animal joint health data exist; controlled human clinical trials are absent.
5.9 Traditional Summary of Evidence Status
Based on available reviews, some traditional uses of Polygonatum species have been confirmed by pharmacological studies, such as its anti-osteoporosis, neuroprotective, immunomodulatory, anti-diabetic, and anti-fatigue effects.
However, confirmation is almost entirely at the in vitro or animal model level; human controlled trials are essentially absent across all areas of use as of the time of the most recent reviews.
While preliminary pharmacological evidence supports many traditional uses, more robust clinical trials are required for mainstream medical validation.
6. Body Systems and Health Areas
Based on traditional use and preclinical pharmacological data, Polygonatum species have been associated with the following body systems:
- Musculoskeletal system: Traditional use for tendons, ligaments, joints, bones; preclinical evidence for anti-osteoporosis and anti-inflammatory activity.
- Metabolic/endocrine system: Preclinical anti-diabetic and lipid-lowering activity; glucose regulation.
- Immune system: Preclinical immunomodulatory and anti-inflammatory activity via multiple signaling pathways.
- Cardiovascular system: Preclinical cardioprotective, anti-atherosclerotic, and lipid-modulating effects.
- Central nervous system: Preclinical neuroprotective and anti-amyloid activity; GABA-receptor modulation in animals.
- Respiratory system: Historical use for dry cough and lung nourishment in TCM; demulcent properties attributed to polysaccharide content.
- Digestive system: Traditional use for digestive disturbances; prebiotic-type effects of polysaccharides on gut microbiota have been observed in preclinical studies.
- Skin:
Some people apply Solomon's seal directly to the skin for bruises, ulcers, or boils on the fingers, hemorrhoids, skin redness, and water retention (edema).
7. Dosage Forms and Reported Dosages
Clinical studies are lacking to provide dosing guidance.
The following dosage information reflects what has been reported in the available scientific literature and does not constitute a recommendation.
- Preclinical (animal) anti-diabetic studies:
The minimum dose of Polygonatum secondary metabolites used in animal diabetes models is 25 mg/kg, and the maximum dose is 2 g/kg.
- Toxicology reference:
An estimated no observed adverse effect level (NOAEL) of the ethanol extract of P. sibiricum has been reported to be more than 2,000 mg/kg in animal toxicology studies.
- PRC Pharmacopoeia quality standard (Yuzhu):
The criterion of quality control for Yuzhu, according to the PRC Pharmacopoeia, is the polysaccharide content; not less than 6% of its dry weight by sulfuric-phenol methods.
- Traditional preparations:
In traditional herbal medicine, Solomon's Seal rhizomes are often prepared as teas, tinctures, or decoctions for internal use, or as ointments for topical application.
No standardized or validated human clinical dosage range has been established in the peer-reviewed literature for any Polygonatum species or preparation.
8. Safety Considerations and Interactions
8.1 General Safety Profile
The rhizomes of Polygonatum plants have a low degree of toxicity after processing.
Polygonatum sibiricum and Polygonatum odoratum have been selected for inclusion in China's Medicinal Food Directory due to their high safety profile.
Fresh rhizomes and plant parts are regarded as traditional foods, and limited studies suggest low toxicity after steaming/cooking processes. Consumption of the crude, unprocessed rhizome reportedly causes death in rodent studies.
This highlights the importance of traditional processing methods (steam-heating, wine-steaming) used in TCM, which are known to alter the phytochemical profile and reduce potential toxicity.
8.2 Gastrointestinal Adverse Effects
The plant poses toxicity risks under certain circumstances, especially when consumed in large quantities or improperly processed. It contains saponins and alkaloids, which can induce adverse symptoms ranging from mild gastrointestinal disturbances to severe poisoning in cases of significant ingestion.
High doses can cause gastrointestinal discomfort, including nausea or vomiting.
8.3 Berries
The berries of Solomon's seal may be emetic.
The berries are not used medicinally and should not be ingested.
8.4 Cardiac Glycoside Content
As members of the Lily family, Solomon's seal species contain some quantity of convallarin, a cardiac glycoside that affects heart muscle regulation. The amounts present in P. biflorum and P. multiflorum are insufficient to have a dangerous effect on heart rate or to interact with cardiac medications.
8.5 Drug Interactions
P. biflorum and P. multiflorum have no documented interactions with pharmaceuticals.
Based on animal studies, adjunctive effects with hypoglycemic agents are possible.
This means individuals taking insulin or oral anti-diabetic medications should be aware of potential additive blood glucose-lowering effects, although this has not been directly demonstrated in human studies.
Solomon's seal contains chemicals that might decrease blood sugar levels.
8.6 Pregnancy and Lactation
Information regarding safety and efficacy in pregnancy and lactation is lacking.
There are no known concerns documented about consuming Solomon's seal while pregnant or breastfeeding.
However, given the absence of controlled human safety data, the most conservative approach in the scientific literature is to avoid use during pregnancy and lactation due to insufficient evidence.
8.7 Contraindications
Formal contraindications have not been identified in the literature.
The crude, unprocessed rhizome carries a higher risk of adverse effects than processed forms. Processing according to traditional methods (e.g., repeated steaming) appears to substantially reduce potential toxicity markers.
8.8 Cancer Cell Considerations
Polygonatum extracts are known to induce both apoptosis and autophagy in cancer cells; however, effects on normal cells are unclear.
This is an area requiring further research before clinical application can be evaluated.
9. Research Gaps and Future Directions
There is a need for standardized extraction protocols, deeper investigations into structure-activity relationships, and translational clinical research to advance the biomedical and industrial applications of PSPs.
To clarify the chemical differences that lead to the different traditional uses between "Huangjing" (derived from P. sibiricum, P. kingianum, P. cyrtonema) and "Yuzhu" (derived from P. odoratum), a systematic comparison of the small molecule compositions and polysaccharides of these four species is needed.
Current research mostly focuses on isolated metabolites, lacking comprehensive narrative analysis.
A critical absence in the literature is the translation of consistently positive preclinical findings into properly designed human randomized controlled trials, without which efficacy claims cannot be validated for any therapeutic indication.
References
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