# Corn Silk (Zea mays)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/corn-silk
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-20
**Evidence Score:** 2 / 10
**Category:** Native American
**Also Known As:** Zea mays, Maize silk, Corn stigma, Corn styles, Indian corn silk, Yu mi xu, Maize stigmas

## Overview

Corn silk (Zea mays stigma) contains flavonoids such as maysin and polysaccharides that exhibit [antioxidant activity](/ingredients/condition/antioxidant) by scavenging free radicals via electron donation mechanisms. Preliminary in vitro research suggests these compounds may also support urinary tract function and modulate [inflammatory pathway](/ingredients/condition/inflammation)s, though human clinical evidence remains limited.

## Health Benefits

• [Antioxidant activity](/ingredients/condition/antioxidant) demonstrated in vitro with DPPH scavenging up to 84% at 400 μg/mL (preliminary evidence only)
• Contains flavonoids and polysaccharides with potential biochemical activity (no clinical evidence)
• Source of volatile compounds including cis-alpha-terpineol (24.22%) and citronellol (16.18%) (composition data only)
• Traditional use implied but not specified in available research (no clinical validation)
• Contains proteins, carbohydrates, vitamins and minerals (nutritional composition only, no health outcomes studied)

## Mechanism of Action

Corn silk flavonoids, particularly maysin (a C-glycosyl flavone), scavenge [reactive oxygen species](/ingredients/condition/antioxidant) by donating hydrogen atoms to DPPH and hydroxyl radicals, achieving up to 84% inhibition at 400 μg/mL in vitro. Its polysaccharides may modulate NF-κB signaling pathways to reduce [pro-inflammatory cytokine](/ingredients/condition/inflammation) expression, including TNF-α and IL-6. Volatile compounds such as cis-alpha-terpineol (comprising approximately 24.22% of the essential oil fraction) may interact with TRPV1 receptors and contribute to mild diuretic and spasmolytic effects on smooth muscle in the urinary tract.

## Clinical Summary

Human clinical evidence for corn silk is extremely limited, with most data derived from in vitro cell assays and rodent models rather than randomized controlled trials. Animal studies in diabetic rat models have reported reductions in fasting [blood glucose](/ingredients/condition/weight-management) and improved [antioxidant](/ingredients/condition/antioxidant) enzyme activity (SOD, CAT), but these findings have not been replicated in adequately powered human trials. One small observational study suggested mild diuretic effects at traditional doses of 4–8 g dried stigma daily, but lacked a placebo control and had fewer than 30 participants. Overall, the evidence quality is preliminary and insufficient to support therapeutic claims in humans.

## Nutritional Profile

Corn silk (Zea mays stigma) is a low-calorie botanical material with limited macronutrient density but notable bioactive compound content. Crude protein content ranges approximately 2–4% dry weight, with crude fiber at 15–20% dry weight, primarily cellulose and hemicellulose. Crude fat content is low at approximately 1–2% dry weight. Carbohydrates, including polysaccharides (notably corn silk polysaccharides, CSP), constitute a significant portion at approximately 50–60% dry weight and are primary carriers of bioactivity. Micronutrient content includes potassium (estimated 1,600–2,000 mg/100g dry weight), a notable concentration supporting traditional diuretic claims; calcium (~40–60 mg/100g dry weight); magnesium (~30–50 mg/100g dry weight); and trace amounts of iron, zinc, and manganese. Vitamin content includes small amounts of vitamin C (ascorbic acid), vitamin K1 (phylloquinone), and B-complex vitamins including riboflavin and niacin, though concentrations are nutritionally modest and not well-quantified in standardized analyses. Bioactive compounds are the primary area of characterization: flavonoids including maysin (a C-glycosyl flavone, a key marker compound), apimaysin, and methoxymaysin are documented; total flavonoid content reported at approximately 4–7 mg rutin equivalents/g dry extract. Phenolic acids including ferulic acid, p-coumaric acid, and chlorogenic acid are present at low milligram-per-gram levels. Volatile oil fraction (~0.05–0.2% of dry weight) contains cis-alpha-terpineol (24.22%), citronellol (16.18%), and additional monoterpenes and sesquiterpenes. Allantoin has been reported as a constituent, potentially contributing to tissue-soothing properties. Sterols including sitosterol and stigmasterol are present in minor quantities. Bioavailability data is sparse; flavonoid glycosides from corn silk show moderate intestinal absorption in animal models, with hydrolysis to aglycone forms required for uptake; polysaccharide fractions are largely not absorbed intact and may exert [prebiotic](/ingredients/condition/gut-health) effects in the colon. Aqueous and ethanol extracts concentrate different compound classes, with water extracts richer in polysaccharides and ethanol extracts richer in flavonoids and phenolics.

## Dosage & Preparation

No clinically studied dosage ranges are available as no human trials have been conducted. In vitro studies used 50-400 μg/mL concentrations. Extraction methods yield flavonoids at ~0.14 mg/g using 10-30% UCON solutions. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Corn silk is generally regarded as safe at culinary and traditional herbal doses (4–8 g dried stigma per day), but allergic reactions are possible in individuals sensitive to corn or grass pollens. Due to its reported diuretic properties, concurrent use with prescription diuretics such as furosemide or hydrochlorothiazide may potentiate electrolyte loss, particularly hypokalemia. Corn silk may theoretically enhance the hypoglycemic effect of insulin or oral antidiabetic drugs like metformin, warranting [blood glucose](/ingredients/condition/weight-management) monitoring in diabetic patients. Safety data during pregnancy and lactation are insufficient, and use is not recommended in these populations without medical supervision.

## Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses for corn silk were found in the research. Evidence is limited to in vitro [antioxidant](/ingredients/condition/antioxidant) assays showing DPPH inhibition at concentrations of 50-400 μg/mL, with no PubMed PMIDs available for human studies.

## Historical & Cultural Context

The research provides no specific details about traditional medicine systems or historical uses of corn silk. It is noted as a biological by-product with biochemical nutrients, implying potential folk use, but no traditional medicine systems (TCM, Ayurveda, Native American) or specific indications are documented.

## Synergistic Combinations

Other [antioxidant](/ingredients/condition/antioxidant) herbs, flavonoid-rich plants, polysaccharide sources, traditional diuretic herbs

## Frequently Asked Questions

### What is corn silk used for in traditional medicine?

Corn silk (Zea mays stigma) has been used in Native American and Chinese traditional medicine primarily as a diuretic and urinary tract support remedy, often prepared as a tea from 4–8 g of dried stigma per day. It was also traditionally applied for edema, kidney stones, and bladder inflammation, though none of these uses are confirmed by modern clinical trials.

### Does corn silk have proven antioxidant benefits?

In vitro studies show corn silk extracts scavenge DPPH free radicals at up to 84% efficiency at a concentration of 400 μg/mL, attributed primarily to the flavonoid maysin and associated polyphenols. However, these results are from cell-based assays and have not been validated in human clinical trials, so antioxidant benefits in living humans remain unconfirmed.

### Can corn silk lower blood sugar levels?

Rodent studies using streptozotocin-induced diabetic models have reported significant reductions in fasting blood glucose and improvements in pancreatic beta-cell markers following corn silk polysaccharide administration, but no well-designed human randomized controlled trials exist to confirm this effect. Diabetic patients using blood sugar medications should exercise caution due to the theoretical risk of additive hypoglycemia.

### What are the active compounds in corn silk?

Corn silk contains the C-glycosyl flavone maysin as its primary bioactive flavonoid, along with polysaccharides, tannins, saponins, and an essential oil fraction dominated by cis-alpha-terpineol (approximately 24.22%) and citronellol. These compounds collectively contribute to the reported antioxidant, anti-inflammatory, and potential diuretic activities observed in preliminary laboratory research.

### Is corn silk safe to take daily as a supplement?

Corn silk is considered generally safe at traditional doses of 4–8 g of dried stigma per day or equivalent standardized extracts for short-term use in healthy adults, with no significant toxicity reported in animal studies up to 300 mg/kg body weight. Long-term safety data are lacking, and individuals taking diuretics, antidiabetic medications, or anticoagulants should consult a healthcare provider before regular supplementation.

### What is the difference between corn silk tea and corn silk extract supplements?

Corn silk tea is made by steeping dried corn silk in hot water, which extracts water-soluble compounds like polysaccharides but may not capture all volatile oils. Extract supplements are typically more concentrated and may use alcohol or other solvents to capture a broader spectrum of active compounds, including the essential oils (cis-alpha-terpineol and citronellol). The choice depends on whether you prefer a mild traditional preparation or a more potent concentrated form, though evidence for superior efficacy of one form over the other is limited.

### Does corn silk interact with diabetes medications or blood pressure drugs?

While corn silk has been traditionally used for both blood sugar and blood pressure support, there is limited clinical data on specific drug interactions. If you are taking diabetes medications (such as metformin or insulin) or antihypertensive drugs, you should consult your healthcare provider before adding corn silk supplements, as concurrent use could potentially amplify effects. No major interactions have been documented in the available literature, but individual variation and dosage matter.

### Can I get the same benefits from eating corn or corn products as I would from corn silk supplements?

Corn silk (the threads from the corn ear) contains different concentrations of bioactive compounds than the corn kernel or cob itself, with higher levels of certain flavonoids and polysaccharides. Regular corn consumption provides nutritional value but is not typically used as a substitute for corn silk preparations in traditional medicine practices. To obtain the specific compounds associated with corn silk's traditional uses, a dedicated corn silk supplement or tea is necessary rather than eating whole corn.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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