Hermetica Superfood Encyclopedia
The Short Answer
Polydatin is a stilbene glycoside naturally occurring in Japanese knotweed (Polygonum cuspidatum) and grape skin, functioning as a glycosylated precursor to resveratrol. It exerts antioxidant and anti-inflammatory effects primarily by scavenging reactive oxygen species and modulating NF-κB signaling pathways.
CategoryNamed Bioactive Compounds
GroupCompound
Evidence LevelModerate
Primary Keywordpolydatin benefits
Synergy Pairings3
Polydatin — botanical close-up
Health Benefits
Origin & History
Natural habitat
Polydatin is a stilbenoid glycoside (the 3-O-β-D-glucopyranoside of resveratrol) primarily extracted from the roots and rhizomes of Fallopia japonica (Japanese knotweed), as well as from grape skins, red/white wines, peanuts, berries, hop cones, and cocoa products. Production methods include direct extraction from plant material or biotransformation via microbial glucosylation of resveratrol using bacteria like Bacillus cereus.
“Fallopia japonica (known as Huzhang in traditional Chinese medicine and Itadori in Japanese medicine) has been used historically for analgesic, anti-pyretic, anti-inflammatory, anti-infection, jaundice, skin burns, and hyperlipemia treatments. The roots and rhizomes have served as the primary source in East Asian traditional medicine systems, predating modern isolation of polydatin.”Traditional Medicine
Scientific Research
The research dossier indicates that search results lack specific details on human clinical trials, RCTs, or meta-analyses for polydatin, with no PubMed PMIDs provided for human studies. Current evidence is limited to preclinical studies demonstrating anti-inflammatory, antioxidant, and anti-tumor activities in cell and animal models.
Preparation & Dosage
Traditional preparation
No clinically studied dosage ranges, forms, or standardization details are available from human trials. Industrial-scale extraction from Polygonum cuspidatum suggests potential for standardized root extracts, but no quantitative dosing guidelines have been established through clinical research. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Polydatin (piceid) is a stilbenoid glucoside compound (C₂₀H₂₂O₈, MW 390.38 g/mol) and the primary natural precursor/glycosylated form of resveratrol. It is not a macronutrient source and has no caloric, protein, fat, or fiber contribution at typical supplement or dietary doses. Key biochemical characteristics: • Structure: Resveratrol-3-O-β-mono-D-glucoside; a single glucose moiety attached at the 3-position of resveratrol, conferring significantly improved water solubility (~30-fold greater than resveratrol) and enhanced stability against enzymatic oxidation and UV-light degradation. • Natural concentrations: Found in Polygonum cuspidatum (Japanese knotweed) root at approximately 0.5–3.0% dry weight (primary commercial source); also present in red grapes (skin: ~0.5–10 mg/kg fresh weight), red wine (~0.5–15 mg/L), peanuts (~0.01–0.5 mg/kg), and various berries in trace amounts. • Bioavailability: Substantially superior oral bioavailability compared to free resveratrol due to active absorption via sodium-dependent glucose cotransporters (SGLT1) in the intestinal epithelium, rather than passive diffusion alone. Studies in animal models suggest ~3–4× higher plasma concentrations (AUC) relative to equimolar doses of resveratrol. The glucose moiety protects against rapid Phase II conjugation (glucuronidation/sulfation) in the intestinal wall and liver, though polydatin is ultimately hydrolyzed to resveratrol by gut microbiota β-glucosidases and enterocyte enzymes. • Key bioactive properties: Potent free radical scavenging (DPPH IC₅₀ ~15–25 µM); inhibition of NF-κB signaling; activation of SIRT1 and AMPK pathways; modulation of Nrf2/ARE antioxidant response element. Typical experimental concentrations range from 10–200 µM in vitro and 25–200 mg/kg body weight in animal models. • Supplement doses: Commonly available at 50–500 mg per capsule; no established RDA or official dietary reference intake. • Micronutrient content: No significant vitamins or minerals are inherent to the isolated compound. When consumed via whole food sources (e.g., grape skin, Japanese knotweed extract), co-occurring compounds include emodin, physcion, other stilbenes (resveratrol, resveratroloside), catechins, and trace minerals dependent on plant matrix.
How It Works
Mechanism of Action
Polydatin inhibits NF-κB activation, thereby suppressing downstream pro-inflammatory cytokines including TNF-α, IL-1β, and IL-6. It activates the Nrf2/HO-1 antioxidant pathway, upregulating heme oxygenase-1 and superoxide dismutase to neutralize reactive oxygen species. Additionally, polydatin modulates SIRT1 and AMPK signaling, influencing cellular energy metabolism and apoptotic pathways via caspase-3 and Bcl-2 family proteins.
Clinical Evidence
The majority of polydatin research consists of in vitro cell studies and rodent models, with limited human clinical data currently available. A small number of pilot human trials have examined polydatin in the context of metabolic disorders and inflammation, including one study of roughly 30 participants showing modest reductions in oxidative stress biomarkers such as malondialdehyde. Preclinical studies consistently demonstrate cytotoxic activity against cancer cell lines including HeLa and MCF-7 at concentrations of 50–200 μM, though these findings have not been replicated in clinical trials. Evidence quality remains preliminary, and no large-scale randomized controlled trials have established efficacy or optimal dosing in humans.
Safety & Interactions
Polydatin is generally considered well-tolerated at doses used in preliminary human studies, typically ranging from 40 to 120 mg per day, with no severe adverse events reported in short-term use. Due to its structural similarity to resveratrol, it may inhibit CYP450 enzymes (particularly CYP3A4 and CYP2C9), potentially increasing plasma levels of anticoagulants like warfarin and certain statins. Polydatin has demonstrated estrogenic activity in preclinical models, making it potentially contraindicated for individuals with hormone-sensitive conditions such as estrogen receptor-positive breast cancer. Pregnant and breastfeeding women should avoid supplementation due to insufficient safety data in these populations.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
3-O-β-D-glucopyranoside of resveratrolresveratrol 3-O-glucosidepiceidresveratrol glucosideHuzhang extractJapanese knotweed extractItadori extractstilbene glucoside
Frequently Asked Questions
What is the difference between polydatin and resveratrol?
Polydatin is the 3-O-glucoside form of resveratrol, meaning it has an attached glucose molecule that increases its water solubility and oral bioavailability compared to resveratrol. Once absorbed, polydatin can be hydrolyzed by intestinal enzymes to release free resveratrol, but it also exhibits independent biological activity through distinct cellular mechanisms. Preclinical studies suggest polydatin may have superior antioxidant potency in certain assays due to this enhanced bioavailability profile.
What foods contain polydatin naturally?
Polydatin is found in the highest concentrations in Japanese knotweed (Polygonum cuspidatum), which is the primary botanical source used in commercial supplements. It is also present in grape skin and wine, particularly red wine, at lower concentrations typically ranging from 0.5 to 2 mg per liter. White mulberry (Morus alba) and peanuts contain trace amounts of polydatin as well.
What is the recommended dosage of polydatin supplements?
No standardized clinical dosage for polydatin has been established due to the lack of large-scale human trials. Preliminary human studies have used doses between 40 mg and 120 mg per day without significant adverse effects. Most commercial supplements provide 50–100 mg per serving, often standardized to a specific percentage of polydatin from Polygonum cuspidatum extract, but these doses are not formally validated by regulatory bodies.
Does polydatin have anti-cancer properties?
In vitro studies have shown polydatin exhibits cytotoxic effects against multiple cancer cell lines, including HeLa cervical cancer cells and MCF-7 breast cancer cells, at concentrations of 50–200 μM by inducing apoptosis via caspase-3 activation and downregulating Bcl-2. Animal studies have supported tumor-suppressive effects in rodent xenograft models. However, no human clinical trials have demonstrated anti-cancer efficacy, and polydatin should not be considered a cancer treatment based on current evidence.
Can polydatin interact with medications?
Polydatin may inhibit cytochrome P450 enzymes CYP3A4 and CYP2C9, which are responsible for metabolizing a wide range of drugs including warfarin, statins, and certain calcium channel blockers. This inhibition could raise plasma drug concentrations and increase the risk of adverse effects or toxicity. Anyone taking anticoagulants, immunosuppressants, or drugs with narrow therapeutic windows should consult a healthcare provider before using polydatin supplements.
What is the bioavailability of polydatin compared to its metabolite resveratrol?
Polydatin is a glycoside form of resveratrol that may offer improved bioavailability due to its ability to be absorbed intact before being metabolized to free resveratrol in the body. However, direct human bioavailability studies comparing polydatin to resveratrol are limited, and most evidence comes from preliminary mechanistic research. The glycosylation of polydatin may enhance intestinal absorption and reduce degradation compared to free resveratrol, though clinical confirmation is needed.
Is polydatin safe for long-term supplementation in healthy adults?
Safety data for long-term polydatin supplementation in humans is limited, with most safety information derived from short-term animal studies and in vitro research. While preliminary studies suggest polydatin has low toxicity at tested doses, comprehensive human safety trials examining chronic use have not been conducted. Anyone considering long-term polydatin supplementation should consult a healthcare provider, especially if taking other medications or supplements.
How does the evidence for polydatin's anti-inflammatory effects compare to established anti-inflammatory supplements?
Polydatin has demonstrated anti-inflammatory activity in preclinical models (cell and animal studies), but clinical trials in humans are lacking, making direct comparisons to established anti-inflammatory supplements difficult. Most evidence for polydatin comes from mechanistic studies rather than controlled human trials, whereas supplements like curcumin and omega-3 fatty acids have more robust clinical research. The anti-inflammatory potential of polydatin remains preliminary and requires human clinical validation before reliable efficacy comparisons can be made.
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