# Woad (Isatis tinctoria) **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/woad **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-04-01 **Evidence Score:** 2 / 10 **Category:** European **Also Known As:** Isatis tinctoria, dyer's woad, asp of Jerusalem, European woad, glastum, pastel, guado, waide ## Overview Woad (Isatis tinctoria) is a European plant historically used for blue dye production, containing indigo compounds as its primary bioactive constituents. Despite traditional medicinal uses, no specific health benefits have been clinically established for woad as scientific research has focused primarily on its dye-producing properties. ## Health Benefits • No specific health benefits have been clinically established for woad (Isatis tinctoria) as the research focused solely on its use in dye production. ## Mechanism of Action Woad contains indigo precursors including indican (indoxyl-β-D-glucoside) which undergoes enzymatic hydrolysis to release indoxyl compounds. The plant also contains various glycosides and phenolic compounds, though their specific molecular targets and pathways in human physiology remain largely unstudied. Most research has focused on the biochemical pathways involved in indigo dye formation rather than therapeutic mechanisms. ## Clinical Summary Clinical research on woad's health benefits is extremely limited, with most studies focusing on its agricultural cultivation and dye extraction processes. No randomized controlled trials have been conducted to evaluate therapeutic effects in humans. Traditional use in folk medicine exists, but lacks scientific validation through modern clinical methodology. The absence of substantial pharmacological research makes it impossible to quantify any potential health outcomes. ## Nutritional Profile Woad (Isatis tinctoria) leaves contain moderate protein levels estimated at 15-25% dry weight, consistent with other Brassicaceae family members. Carbohydrates constitute approximately 40-50% dry weight, with dietary fiber contributing significantly to this fraction. Fat content is low, typically under 5% dry weight. The plant's most notable bioactive compounds are indole alkaloids: indican (indoxyl-beta-D-glucoside) is the primary precursor compound that hydrolyzes to yield indigotin (indigo), present at concentrations of 0.2-0.5% in fresh leaves. Sinigrin and other glucosinolates are present as secondary metabolites, typical of Brassicaceae, at concentrations of 1-5 µmol/g fresh weight. Isatan B (isatide) is a unique dimeric indole compound documented at trace levels. The plant contains tryptanthrin (an alkaloid with documented [antimicrobial](/ingredients/condition/immune-support) properties) at approximately 0.01-0.05% dry weight. Flavonoids including quercetin and kaempferol glycosides are present at levels comparable to related cruciferous vegetables (1-3 mg/g dry weight). Vitamins: Vitamin C is present given its Brassicaceae family membership, estimated 50-100 mg/100g fresh weight, though not formally quantified for woad specifically. Minerals including calcium, potassium, and iron are expected at levels similar to related leafy Brassicaceae crops. Bioavailability is likely reduced by glucosinolate-myrosinase interactions and the presence of oxalic acid, which may chelate divalent minerals. The root contains additional polysaccharides and the alkaloid compound woadwaxen at trace concentrations. ## Dosage & Preparation There are no clinically studied dosage ranges for woad as no therapeutic trials were identified. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Safety data for woad consumption is insufficient due to lack of clinical studies and modern therapeutic use. Potential allergic reactions may occur, particularly in individuals sensitive to plants in the Brassicaceae family. No specific drug interactions have been documented, though this reflects the absence of research rather than confirmed safety. Pregnant and breastfeeding women should avoid use due to unknown safety profile and lack of toxicological data. ## Scientific Research There are no human clinical trials, RCTs, or meta-analyses found for woad (Isatis tinctoria) in biomedical contexts. The available studies are centered on dye extraction processes. ## Historical & Cultural Context Woad has been used for over 2,000 years in European traditions primarily as a natural blue dye for textiles, inks, and cosmetics. Its historical use is mainly associated with dyeing rather than medicinal purposes. ## Synergistic Combinations None identified due to lack of therapeutic evidence ## Frequently Asked Questions ### What compounds are found in woad? Woad contains indican (indoxyl-β-D-glucoside) as its primary compound, along with various glycosides and phenolic compounds. These compounds are primarily responsible for the plant's historical use in blue dye production. ### Is woad safe to consume as a supplement? Woad's safety for human consumption is unknown due to insufficient research and lack of toxicological studies. No standardized dosing guidelines exist, and potential side effects have not been systematically evaluated. ### Does woad have any proven health benefits? No specific health benefits have been clinically established for woad through scientific research. While traditional uses exist in folk medicine, these have not been validated through modern clinical trials. ### How was woad traditionally used in medicine? Historically, woad was used in traditional European folk medicine for various purposes, though specific applications varied by region. However, these traditional uses lack scientific validation and clinical evidence for effectiveness. ### Can woad interact with medications? No specific drug interactions have been documented for woad, primarily because comprehensive pharmacological studies have not been conducted. Anyone considering its use should consult healthcare providers due to unknown interaction potential. ### What is the difference between woad used as a dye versus woad supplements? Woad has been historically valued primarily as a blue dye source, with indigo being its main coloring compound, rather than as a medicinal supplement with established therapeutic uses. While traditional Chinese medicine included Isatis tinctoria (known as banlangen) in herbal formulas, modern supplement forms lack the robust clinical evidence supporting specific health claims that would justify therapeutic dosing. The distinction is important because historical dye production and traditional use do not automatically translate to safe or effective supplementation in contemporary practice. ### Why is there limited clinical research on woad as a health supplement? Most scientific research on woad (Isatis tinctoria) has focused on its historical use as a natural dye and its chemical composition rather than its efficacy as a therapeutic agent, leaving significant gaps in human clinical trials. This research bias means that while the plant's chemical compounds are documented, there is insufficient evidence from controlled studies to establish dosage guidelines or health benefits for supplement users. Consumers should be cautious about supplements marketed for health purposes when the available research base is primarily focused on non-medicinal applications. ### Are there safer, better-researched alternatives to woad for traditional herbal support? Given the limited clinical evidence specific to woad supplementation, herbs with more robust research backing—such as elderberry, echinacea, or other traditionally used botanicals with documented human trials—may be preferable alternatives. If you are interested in traditional Chinese herbal formulas historically containing banlangen (Isatis tinctoria), consulting with a qualified herbalist or healthcare provider can help identify formulations with stronger safety and efficacy profiles. The choice between woad and alternatives should prioritize ingredients supported by clinical research relevant to your health goals. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*