If you have a bottle of Solomon’s seal tincture in your cabinet, or a patch of it arching over the shady side of your yard, here is the honest summary: Solomon’s seal is a real medicinal plant with a documented history stretching back nearly two thousand years, and almost no modern human evidence behind the claims currently made for it.
That gap matters. The Solomon’s seal plant is sold in the United States for joint pain, tendon injuries, dry cough, blood sugar, and skin repair. Traditional herbalists have used it for all of those things. But traditional use and proven benefit are different claims, and this plant sits squarely in the space between them — close enough to be interesting, far enough that the confident product copy is doing work the science hasn’t done.
What Solomon’s Seal Actually Is
Solomon’s seal is the common name for plants in the genus Polygonatum — woodland perennials with arching stems, parallel-veined oval leaves, and small bell-shaped flowers that dangle underneath the stem from the leaf axils. Modern classification places them in the Asparagaceae, the asparagus family, not the lily family where older herbal books put them [North Carolina Extension Gardener Plant Toolbox, Polygonatum biflorum].
The name comes from the rhizome. Each year the plant sends up a single stem from its underground rhizome; when that stem dies back in winter, it leaves a round scar. Over several seasons the rhizome accumulates a row of these circular marks, which look enough like wax seals pressed into a document that the plant picked up the name. Count the scars and you get a rough count of the plant’s age.
Which Polygonatum you are dealing with depends on where you are, and the species are not interchangeable in the research literature even though they are often treated as interchangeable on product labels.
| Species | Common name | Native range | Where it shows up |
| Polygonatum biflorum | Smooth or King Solomon’s seal | Eastern and central North America | The wild plant in most of the US; the one in shade gardens |
| Polygonatum odoratum (Mill.) Druce | Angular or scented Solomon’s seal | Europe through to Japan | Most US tinctures and extracts |
| Polygonatum multiflorum | Common or Eurasian Solomon’s seal | Europe and western Asia | European herbal tradition |
| Polygonatum sibiricum | Huangjing | Northern China, Siberia, Korea | Chinese herbal medicine; the one small human trial |
Two naming notes will save you confusion when you compare a product label against a research paper. Polygonatum officinale All. is an older name; Kew’s Plants of the World Online lists it as a synonym of Polygonatum odoratum var. odoratum, so a label reading “officinale” is almost certainly P. odoratum [Plants of the World Online, Polygonatum officinale All.]. Separately, P. multiflorum is a European plant whose native range does not include North America [Plants of the World Online, Polygonatum odoratum]. If you read anywhere that the American Solomon’s seal is P. multiflorum, that is a mix-up. The eastern North American native is P. biflorum [Native Plant Trust Plant Finder, Polygonatum biflorum].
A third name collision carries a real safety consequence. Polygonum multiflorum — spelled without the “at,” also sold as He Shou Wu or Fo-Ti — is a completely different plant in a different family, and it has a well-documented association with liver injury, including jaundice and elevated liver enzymes [Qian et al., Frontiers in Pharmacology, 2024]. Polygonatum and Polygonum have no relationship beyond a similar spelling. If you go looking into Solomon’s seal and land on alarming liver-toxicity papers, check the spelling before you panic. Then check it again before you buy anything, because the two names get swapped in online listings.
The Dioscorides Connection
Solomon’s seal shows up early in the written record. Pedanius Dioscorides, the Greek physician and pharmacologist who lived roughly AD 40 to 90, described it in De materia medica, the five-book pharmacological text that stayed the standard reference for something like sixteen centuries [Encyclopaedia Britannica, Pedanius Dioscorides]. He recommended it for wounds and bruises — the same uses that carried forward into European folk medicine and, eventually, onto the labels of American herbal salves.
That is a genuinely long track record. It is also, on its own, not evidence of effect. Dioscorides recommended a great many things.
What Is Actually in the Rhizome
The medicinal part is the rhizome — the knobby underground stem, not the root, not the berries, not the leaves. Chemical analysis of Polygonatum odoratum has identified roughly 174 distinct compounds, falling mainly into four groups: polysaccharides, flavonoids, steroidal saponins, and a mix of others [Zhang et al., Naunyn-Schmiedeberg’s Archives of Pharmacology, 2025]. Across the genus more broadly, the recognized constituents include steroidal and triterpenoid saponins, isoflavanones, polysaccharides, and lectins [Drugs.com Natural Products Database, Solomon’s Seal].
The polysaccharides get the most research attention, and they are the compounds behind most of the metabolic claims you will see. The saponins are the ones behind the plant’s soapy, slightly irritating quality when raw — which is part of why Chinese preparation methods traditionally involve repeated steaming rather than using the fresh rhizome.
Older herbal sources sometimes attribute the plant’s blood-sugar effects to a compound called “glycoquinine.” That name does not appear in the modern chemical literature on Polygonatum, and the reviews that catalog the genus at the level of individual compounds do not list it. Treat it as a historical term rather than an identified active ingredient.
What the Evidence Actually Shows
The honest picture is thinner than the marketing suggests. What follows is graded by the kind of study that actually exists behind each claim.
Sleep: One Small Human Trial, One Species
The strongest human evidence for any Polygonatum species is a single randomized, double-blind, placebo-controlled trial published in Nutrients in 2019. Eighty adults aged 20 to 65 with mild insomnia took either 500 mg of Polygonatum sibiricum rhizome extract or placebo, half an hour to an hour before bed, for four weeks. Seventy-five completed the study. The extract group improved more on the Athens Insomnia Scale than placebo (p = 0.035) and increased total sleep time while the placebo group’s decreased (p = 0.046). No participant reported an adverse event [Ha et al., Nutrients, 2019].
That is a real, well-designed trial. It is also one study, with 75 completers, running four weeks, in people with mild insomnia and no daytime impairment. The authors say plainly that four weeks does not support conclusions about long-term safety. And it tested P. sibiricum, which is not the species in most American Solomon’s seal products. A single positive trial is a reason for further research, not a reason to treat the question as settled.
Blood Sugar: Rodents Only
Solomon’s seal has a long traditional association with diabetes, and the animal data is consistent enough to explain why the idea persists. A polysaccharide isolated from P. odoratum significantly lowered fasting blood glucose in streptozotocin-induced diabetic mice, along with reductions in total cholesterol, triglycerides, LDL, fasting insulin, and HOMA-IR [Jiang et al., International Journal of Food Science and Technology, 2018]. Reviews of the genus catalog antidiabetic activity alongside antioxidant, anti-inflammatory, immunomodulatory, and antitumor effects in laboratory models [Zhang et al., 2025].
Every one of those findings is from a cell culture or an animal. Mice are not people, streptozotocin-induced diabetes is not type 2 diabetes as it develops in humans, and an isolated purified polysaccharide is not a cup of decoction or a dropper of tincture. Drugs.com’s assessment of the genus is blunt on this point: “clinical studies are lacking to recommend use for any indication” [Drugs.com Natural Products Database, Solomon’s Seal].
If you have diabetes, the practical translation is that Solomon’s seal should not be treated as a blood-sugar treatment, and it should not displace anything your doctor prescribed. Understanding how blood sugar actually behaves day to day will do more for you than any herb currently on the shelf.
Joints, Tendons, and Wounds: Traditional Use, Not Tested
This is Solomon’s seal’s biggest market in the US. It is sold widely for tendon and ligament injuries, joint pain, and connective tissue repair, often with confident language about “lubricating” joints or “resetting” tendons.
There is no human trial supporting any of it. There is preclinical work — extracts from various Polygonatum species have accelerated wound healing in rats and shown activity in cell-based assays — but that research sits in low-tier journals, uses different species and different preparations, and has never been carried into a controlled human study. Traditional use across Chinese, European, and Native American systems is real and documented. It is a reason to investigate, not a substitute for having investigated.
Skin and Cosmetic Claims: Insufficient Evidence
Traditional European use included poultices and compresses for bruises, boils, and abscesses, and Solomon’s seal still appears in salves marketed for skin texture. No controlled human study supports a cosmetic or dermatologic effect. If skin is your actual concern, the evidence behind herbal skin remedies is a more useful place to start, because a few of them do have data behind them and most do not.
Cough and Dry Throat: Traditional, Plausible, Unproven
In Chinese medicine, Polygonatum species are classed as yin-nourishing herbs and used for dry cough, dry throat, and general depletion [Drugs.com Natural Products Database, Solomon’s Seal]. The mucilage content makes a soothing effect on an irritated throat mechanically plausible, in the same way honey is soothing. That is a reasonable expectation to hold. It is not the same as a treatment for a respiratory condition.
How Solomon’s Seal Is Traditionally Prepared
No clinical dosing exists for Solomon’s seal. Drugs.com states this directly — there is no evidence-based dose for any indication [Drugs.com Natural Products Database, Solomon’s Seal]. What follows describes what traditional and commercial preparations look like, so you know what you are looking at. It is not a dosing recommendation, and you should settle the dose question with a doctor or pharmacist rather than a label.
Decoction. Because the active compounds sit in a tough rhizome, the traditional water preparation is a decoction — simmered, not steeped. European herbal texts describe simmering dried rhizome in water and drinking it as a tea. If you want the general mechanics of how decoctions, infusions, and tinctures differ, that is a useful background piece.
Tincture. Most American products are alcohol extracts of P. odoratum rhizome, sold in dropper bottles. Concentrations vary widely between manufacturers, and there is no standardization across the category.
Topical poultices and salves. Mashed fresh rhizome, or rhizome infused into oil, applied to bruises and sore joints. This is the dominant traditional external use.
Steamed rhizome, Chinese-style. In Chinese preparation, the rhizome is steamed and dried repeatedly before use. Drugs.com notes that Polygonatum preparations are regarded as low-toxicity foods after steaming and cooking [Drugs.com Natural Products Database, Solomon’s Seal], which points to processing being part of how the material is traditionally made tolerable rather than an optional refinement.
One historical footnote with a modern caveat: the starchy rhizome of P. biflorum was eaten as food by early Americans, in a potato-like way [Missouri Botanical Garden Plant Finder, Polygonatum biflorum]. That is a documented food use, and it is not a license to dig up and eat plants you find in the woods — see the identification section below.
Safety: What Can Actually Go Wrong
The Berries and Leaves
Do not eat the berries. North Carolina State Extension rates Polygonatum biflorum fruit as poisonous, with anthraquinone as the toxic principle and vomiting and diarrhea as the expected symptoms. The severity rating is low, which means a berry or two is more likely to cause a bad stomach than a medical emergency — but “low severity” is a description of typical outcomes, not permission [North Carolina Extension Gardener Plant Toolbox, Polygonatum biflorum].
Older herbal sources often describe the berries and leaves as highly poisonous. That is stronger language than the horticultural toxicity databases support for Polygonatum, and the two accounts genuinely conflict. The practical guidance lands in the same place either way: the rhizome is the medicinal part, and nothing else on the plant should be eaten.
If a child eats berries off any plant, including this one, contact Poison Control at 1-800-222-1222 or use the webPOISONCONTROL online tool. Both are free, confidential, and available around the clock [Poison Control, Fall Berries Only Look Edible].
Who Should Avoid Solomon’s Seal
If you are pregnant or breastfeeding. Drugs.com’s guidance is to avoid it, because safety and efficacy information in pregnancy and lactation is lacking [Drugs.com Natural Products Database, Solomon’s Seal]. NCCIH makes the broader point that many supplements have never been tested in pregnant women, nursing mothers, or children [NCCIH, Using Dietary Supplements Wisely]. Absence of evidence is not reassurance.
If you take diabetes medication. The sources disagree here, and the disagreement is the answer. Drugs.com reports no well-documented interactions for Solomon’s seal [Drugs.com Natural Products Database, Solomon’s Seal]. But the animal literature consistently shows blood-glucose lowering, which raises a theoretical concern about additive effect on top of insulin or an oral agent. Nobody has tested that combination in humans. If you take diabetes medication and want to try Solomon’s seal, that is a conversation to have with your doctor or pharmacist before you start, and a reason to know the warning signs of blood sugar going too low.
If you have surgery scheduled. NCCIH advises telling all your healthcare providers about supplements well in advance, because some can increase bleeding risk or affect how you respond to anesthesia [NCCIH, Using Dietary Supplements Wisely]. Solomon’s seal has not been specifically studied for this, which is precisely why the general caution applies.
If you are giving it to a child. There is no pediatric safety data. Don’t.
Product Quality Is Its Own Risk
The FDA is not authorized to approve dietary supplements for safety and effectiveness before they are marketed [FDA, Information for Consumers on Using Dietary Supplements]. That is not a scandal, it is how the law is written — but it means the burden of checking sits with you.
For herbs in the Chinese medicine tradition specifically, NCCIH documents that products have been found contaminated with undeclared plant or animal material, pharmaceutical drugs, heavy metals, pesticides, and sulfites, and that manufacturing errors substituting one herb for another have caused serious complications [NCCIH, Traditional Chinese Medicine: What You Need To Know]. NCCIH also notes that a manufacturer’s use of “standardized,” “verified,” or “certified” does not by itself guarantee quality or consistency [NCCIH, Using Dietary Supplements Wisely].
Practically: look for a product that names the species on the label, states the plant part as rhizome, and carries independent third-party testing. A label that says only “Solomon’s Seal” without a Latin binomial is telling you the manufacturer either does not know or does not want to say.
Telling It Apart From Dangerous Lookalikes
If you are foraging rather than buying — and this is where the risk stops being theoretical — two lookalikes matter.
False Solomon’s seal (Maianthemum racemosum) grows in the same woodlands with a similar arching stem. The distinguishing feature is the flowers: true Solomon’s seal flowers hang in bells from the leaf axils along the underside of the stem, while false Solomon’s seal carries a plume of tiny flowers at the stem’s tip. Its berries turn ruby red rather than blue-black [North Carolina Extension Gardener Plant Toolbox, Maianthemum racemosum]. This one is not the dangerous confusion.
Lily of the valley (Convallaria majalis) is. It shares the same family and similar early-season foliage, and unlike Solomon’s seal, every part of it is toxic — bark, flowers, fruit, leaves, roots, sap, seeds, and stems — via cardiac glycosides and saponins. Symptoms of a significant ingestion include irregular and slow pulse, abdominal pain, diarrhea, low blood pressure, disorientation, seizures, and coma [North Carolina Extension Gardener Plant Toolbox, Convallaria majalis]. This is a heart-rhythm poison, and it grows in the same kind of shady ground.
If you cannot identify a plant with total certainty, do not harvest it. Buying a labeled product from a reputable supplier is the lower-risk path, and it is the one most people should take.
When to Call a Doctor
Herbal remedies are not the right tool for a situation that is actually escalating. Get medical care rather than reaching for a supplement if you have:
- Chest pain, an irregular or very slow heartbeat, or fainting after any plant ingestion — call 911
- Severe or persistent vomiting and diarrhea, or signs of dehydration
- Yellowing of the skin or eyes, dark urine, or right-upper-abdominal pain
- A wound that is spreading redness, warming, streaking, or producing pus
- Joint pain with fever, or a joint that is hot, swollen, and cannot bear weight
- Blood sugar readings that are running unusually low, especially if you take insulin or a sulfonylurea
- A cough that has lasted more than three weeks, or any cough with blood
Any confirmed or suspected ingestion of lily of the valley warrants an immediate call to Poison Control at 1-800-222-1222, whether or not symptoms have started.
Where the Solomon’s Seal Plant Actually Stands
Solomon’s seal is a genuine medicinal plant with an unusually long documented history, a well-characterized chemistry, and a body of laboratory work suggesting some of the traditional claims may eventually hold up. What it does not have is human evidence. One small four-week sleep trial in a single species is the entirety of it.
That does not make the plant worthless, and it does not make traditional herbalists wrong. It makes the honest position “we don’t know yet.” If you want to try it for a minor complaint, are not pregnant, are not on medication it might stack with, and buy a species-labeled product from a supplier that tests its material, the risk is modest. If you are hoping it will do something a doctor should be doing — treat your diabetes, repair a torn tendon, resolve a cough that will not quit — the plant is not going to carry that weight, and waiting on it costs you time you may not have.
| Health Disclaimer: This article is for general education and is not medical advice. It is not a substitute for diagnosis, treatment, or advice from a qualified healthcare professional. Solomon’s seal has not been evaluated by the FDA for the treatment of any condition, and no clinical dosing has been established. Talk with your doctor, pharmacist, or a registered dietitian before starting Solomon’s seal or any herbal product, particularly if you are pregnant or breastfeeding, are taking prescription medication, have a chronic condition, or have surgery scheduled. If you think you have a medical emergency, call 911. For a suspected poisoning, call Poison Control at 1-800-222-1222. |
Frequently Asked Questions
Is the Solomon’s seal plant safe to take every day?
Nobody knows, and that is the honest answer. There is no established clinical dose and no long-term human safety data for any Polygonatum species. The one controlled human trial ran four weeks and its authors said explicitly that this was too short to draw conclusions about long-term safety [Ha et al., Nutrients, 2019]. If you are considering daily use, particularly alongside prescription medication, that decision belongs with your doctor or pharmacist rather than a product label.
Can you eat Solomon’s seal berries?
No. The berries of Polygonatum biflorum are listed as poisonous, with anthraquinone as the toxic principle and vomiting and diarrhea as the typical effects [North Carolina Extension Gardener Plant Toolbox, Polygonatum biflorum]. The severity rating is low, so a single berry is more likely to cause a rough stomach than an emergency, but there is no reason to find out. If a child eats them, call Poison Control at 1-800-222-1222.
Does Solomon’s seal actually help tendons and joints?
There is no human trial testing it for tendon, ligament, or joint problems. That is the single most common use it is marketed for in the US, and it rests entirely on traditional practice plus a small amount of animal and cell-based work. Drugs.com’s summary of the genus is that clinical studies are lacking to recommend use for any indication [Drugs.com Natural Products Database, Solomon’s Seal]. A tendon injury that is not resolving needs an actual diagnosis.
What is the difference between Solomon’s seal and false Solomon’s seal?
Look at where the flowers sit. True Solomon’s seal (Polygonatum) hangs bell-shaped flowers underneath the stem from the leaf axils, and its berries ripen blue to black. False Solomon’s seal (Maianthemum racemosum) carries a feathery plume of tiny flowers at the tip of the stem, with berries that ripen ruby red [North Carolina Extension Gardener Plant Toolbox, Maianthemum racemosum]. The more dangerous confusion is with lily of the valley, which is toxic in every part.
Is Solomon’s seal the same as He Shou Wu or Fo-Ti?
No, and this is a confusion worth clearing up. He Shou Wu is Polygonum multiflorum, a different plant in a different family with a documented association with liver injury [Qian et al., Frontiers in Pharmacology, 2024]. Solomon’s seal is Polygonatum — note the extra letters. The names look nearly identical in a product listing, so check the spelling on anything you buy.
Can I take Solomon’s seal while pregnant or breastfeeding?
The guidance is to avoid it. Safety and efficacy information for Polygonatum in pregnancy and lactation is lacking [Drugs.com Natural Products Database, Solomon’s Seal], and NCCIH notes that many dietary supplements have simply never been tested in pregnant women, nursing mothers, or children [NCCIH, Using Dietary Supplements Wisely]. Untested is not the same as safe.
References
- North Carolina Extension Gardener Plant Toolbox. “Polygonatum biflorum (Great Solomon’s Seal, Smooth Solomon’s Seal).” NC State Extension. View source
- North Carolina Extension Gardener Plant Toolbox. “Convallaria majalis (Lily of the Valley).” NC State Extension. View source
- North Carolina Extension Gardener Plant Toolbox. “Maianthemum racemosum (False Solomon’s Seal).” NC State Extension. View source
- Missouri Botanical Garden. “Polygonatum biflorum.” Plant Finder. View source
- Native Plant Trust. “Polygonatum biflorum — King Solomon’s seal.” Plant Finder. View source
- Plants of the World Online. “Polygonatum odoratum (Mill.) Druce.” Royal Botanic Gardens, Kew. View source
- Plants of the World Online. “Polygonatum officinale All.” Royal Botanic Gardens, Kew. View source
- Encyclopaedia Britannica. “Pedanius Dioscorides.” Encyclopaedia Britannica, Inc. View source
- Zhang Y, Li X, Yu D, Yang Z, Shen Z, Meng Y, Ding Y, Li Y. “Botany, chemistry, bio-activity, and application of Polygonatum odoratum (Mill.) Druce: a comprehensive review.” Naunyn-Schmiedeberg’s Archives of Pharmacology, 2025. DOI: 10.1007/s00210-025-04210-y View source
- Drugs.com. “Solomon’s Seal Uses, Benefits & Dosage.” Natural Products Database, 2025. View source
- Ha E, Hong H, Kim TD, Hong G, Lee S, Kim S, Kim N, Jeon SD, Ahn CW, Kim HJ, Lee YJ, Yoon S, Kim GH, Kim J. “Efficacy of Polygonatum sibiricum on Mild Insomnia: A Randomized Placebo-Controlled Trial.” Nutrients, 2019;11(8):1719. DOI: 10.3390/nu11081719 View source
- Jiang H, Xu Y, Sun C, Adu-Frimpong M, Yu J, Deng W, Xu X. “Physicochemical properties and antidiabetic effects of a polysaccharide obtained from Polygonatum odoratum.” International Journal of Food Science and Technology, 2018;53(12):2810–2818. DOI: 10.1111/ijfs.13896 View source
- Qian et al. “Phytochemistry, pharmacology, toxicology and detoxification of Polygonum multiflorum Thunb.: a comprehensive review.” Frontiers in Pharmacology, 2024. PMCID: PMC11215120. DOI: 10.3389/fphar.2024.1427019 View source
- U.S. Food and Drug Administration. “Information for Consumers on Using Dietary Supplements.” FDA. View source
- National Center for Complementary and Integrative Health. “Using Dietary Supplements Wisely.” NCCIH, National Institutes of Health. View source
- National Center for Complementary and Integrative Health. “Traditional Chinese Medicine: What You Need To Know.” NCCIH, National Institutes of Health. View source
- National Capital Poison Center. “Fall berries only look edible.” Poison Control. View source
