Piceid

Piceid is a naturally occurring stilbene glycoside and the glycosylated form of resveratrol, found abundantly in grapes, peanuts, and Japanese knotweed. It exerts antioxidant and neuroprotective effects primarily by scavenging reactive oxygen species, modulating antioxidant enzymes such as superoxide dismutase and catalase, and activating SIRT1-related pathways after conversion to resveratrol by gut microbiota.

Origin & History

Piceid, also known as polydatin, is a natural polyphenol and stilbene compound found primarily in the roots and stems of Polygonum cuspidatum (Japanese knotweed) and grapes. It is the glucoside form of resveratrol, which influences its bioavailability and biological activity.

Historical & Cultural Context

The research provides no information on the traditional use of piceid, indicating it is primarily studied as a modern pharmaceutical candidate rather than a traditional remedy.

Health Benefits

• Neuroprotection in Parkinson's disease models: Piceid restored antioxidant enzyme levels and motor function in rodent models of Parkinson's disease, comparable to L-dopa [1][2]. • Antioxidant activity: Piceid demonstrated higher hydroxyl radical scavenging capacity than resveratrol and vitamin C in vitro [3][4]. • Oxidative stress reduction: It decreases lipid peroxidation, as evidenced by reduced malondialdehyde levels in rodent studies [1]. • Mitochondrial function restoration: Piceid restores ATP levels in models impaired by oxidative stress [1]. • Neuronal survival signaling: Increased phosphorylated Akt and reduced caspase-3 activity were noted in MPTP models, promoting neuron survival [1].

How It Works

Piceid functions as a prodrug that is hydrolyzed by intestinal beta-glucosidases into free resveratrol, which then activates SIRT1 deacetylase and modulates NF-κB signaling to reduce oxidative stress and inflammation. In its intact glycoside form, piceid directly scavenges hydroxyl radicals and superoxide anions, upregulating endogenous antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx). Additionally, piceid inhibits dopaminergic neuron apoptosis by suppressing mitochondrial cytochrome c release and caspase-3 activation, contributing to its neuroprotective profile.

Scientific Research

The research dossier contains no human clinical trials or meta-analyses, with all evidence coming from preclinical animal studies in rodent models of Parkinson's disease. No PubMed PMIDs for human trials were identified.

Clinical Summary

Most evidence for piceid comes from preclinical rodent studies; for example, in 6-OHDA-induced Parkinson's disease models, piceid administration restored SOD and catalase levels and improved motor function to a degree comparable to L-dopa treatment. In vitro assays have demonstrated that piceid exhibits higher hydroxyl radical scavenging capacity than both resveratrol and vitamin C, suggesting enhanced direct antioxidant potency. Human clinical trials are currently limited, and most pharmacokinetic data derive from animal studies or small pilot bioavailability investigations, making it premature to draw firm efficacy conclusions for human supplementation. The overall evidence base is promising but remains in early-stage research, requiring randomized controlled trials to validate dosing and outcomes.

Nutritional Profile

Piceid (polydatin; resveratrol-3-O-β-D-glucopyranoside) is a stilbenoid glucoside, not a macronutrient source. It is the major naturally occurring glycosylated form of resveratrol (trans-resveratrol). Molecular formula: C₂₀H₂₂O₈; molecular weight: 390.38 g/mol. It does not contribute meaningful calories, protein, fat, fiber, vitamins, or minerals at typical dietary or supplemental doses. Key bioactive characteristics: • Primary bioactive compound class: Stilbene glucoside (polyphenol). • Natural concentrations in food sources: Found predominantly in the root and rhizome of Polygonum cuspidatum (Japanese knotweed), where it can reach 2–5% dry weight; present in red grape skins (~0.5–3.0 mg/kg fresh weight), wines (typically 0.5–15 mg/L in red wines, trace amounts in white wines), peanuts, and various berries at lower concentrations. • Bioavailability notes: Piceid exhibits significantly higher oral bioavailability than free resveratrol due to its glucose moiety, which enhances water solubility (~30-fold more water-soluble than resveratrol). It is absorbed in the small intestine via sodium-dependent glucose transporter SGLT1 and is subsequently hydrolyzed by intestinal β-glucosidases and gut microbiota to release free resveratrol. Studies in rats indicate that oral bioavailability of piceid is approximately 2–3 times higher than that of resveratrol. Peak plasma concentrations after oral dosing (e.g., 100 mg/kg in rodents) are typically reached within 30–60 minutes. Piceid also undergoes extensive phase II metabolism (glucuronidation and sulfation) in the liver and intestinal wall, yielding conjugated metabolites that circulate in plasma. • Other notable chemical properties: The trans-isomer (trans-piceid) is more biologically active and predominant in nature compared to cis-piceid; it retains intrinsic antioxidant capacity (phenolic hydroxyl groups) even before hydrolysis to resveratrol, with demonstrated hydroxyl radical scavenging (IC₅₀ values reported in the low micromolar range, superior to resveratrol and ascorbic acid in certain in vitro assays). No significant vitamin or mineral content; no macronutrient contribution at pharmacologically relevant doses (typically studied at 10–200 mg/day in human supplements or 10–100 mg/kg in animal models).

Preparation & Dosage

In rodent studies, piceid was administered at dosages of 50–200 mg/kg/day, with 80 mg/kg showing superior motor improvement. No standardized human dosages are documented. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

L-dopa, Resveratrol, Vitamin C, Piperine, Thioredoxin

Safety & Interactions

Piceid is generally considered well-tolerated at dietary intake levels, with no significant adverse effects reported in available preclinical studies, though systematic human safety data are lacking. Because piceid is metabolized to resveratrol, it may share resveratrol's potential interactions with anticoagulants such as warfarin and CYP450-metabolized drugs, including CYP3A4 and CYP2C9 substrates, potentially altering their plasma concentrations. Individuals taking antiplatelet medications or blood thinners should exercise caution due to resveratrol's known anticoagulant properties. Safety during pregnancy and lactation has not been established, and use is not recommended in these populations without medical supervision.