🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 50% of ingredients have research evidence
A Label Compliance Grade

Product Label

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Label Data

1 Capsule(s) Serving Size
240 Servings
Other Combinations Product Type
50% Evidence Coverage

Supplement Facts — Evidence Check

Vitamin C
25 mg (28% DV)
📊 Market median: 500.0mg (283 products) 📚 173 studies (Tier A: 0, B: 62)
This product: 25mg

Other Ingredients

Gelatin

Label Claims — Verification

All Other
Structure/Function
All Other (99% of products) Structure/Function (84% of products) Nutrient (23% of products) Qualified Health (1% of products)

Target Groups

Adult (18 - 50 Years) No Allergies Gluten Free Dairy Free Sugar Free

Product Information

📋 Directions for Use

Suggested Use Consume one capsule daily. You can increase your intake as required or as guided by your physician.

🧪 Formulation Notes

Since 1979, unsurpassed purity, quality and efficacy. 100% solar production Zero-carbon footprint

100% Solar Optimal Absorption and Activity

Phospholipid Complex

Quercetin 500 provides the unique benefits of one of nature’s most powerful protective molecules. Like so many of nature’s most beneficial plant-based compounds, quercetin is a polyphenol and flavonoid. In fact, flavonoid polyphenols are the beneficial compounds that make many healthy foods so healthy, such as green tea, red wine and chocolate. Quercetin is uniquely abundant in capers, red onions and cilantro, but also rich in many other healthy foods. Quercetin has long been the subject of extensive research validating its protective benefits to diverse systems in the body. Quercetin is well known for its benefits promoting healthy circulation and supporting the structure of our blood vessels, veins and capillaries. More recently, quercetin has been recognized for its supportive benefits to the cardiopulmonary system, including the fragile tissues of both the heart and lungs. Quercetin has also been shown to support immune system function, as well as the normally problematic aging prostate gland. Quercetin’s impressive body of research has made it a popular ingredient in nutritional supplements; however, its benefits are limited due to its extremely poor absorption. We overcome these absorptive challenges by complexing quercetin with phosphatidyl choline (PC), which is the predominant phospholipid found in the brain and liver. This unique phospholipid complex protects quercetin from digestive damage while also dramatically increasing its absorption. This natural combination of quercetin with PC ensures you receive all the remarkable benefits of this extraordinary natural molecule.

Contains no additives or common allergens Contains no milk, soy, yeast, corn, wheat, gluten, sodium, salt, sugar, fat, cholesterol, color, preservative, common allergens, genetically modified (GMO) ingredients or manufacturing additives.

Additional Information

For questions about the use of this product call 800.800.1200.

Questions? Reorders? 800.800.1200 Procaps.com

Andrew Lessman

Product Details

UPC / SKU 712545
DSLD Entry Date 2024-11-22
Product Type Other Combinations
Form Capsule
DSLD ID 320266
Data Updated 2026-04-11

Research Evidence

184 Research Sources
55 Avg Quality Score
91 Systematic Review
75 Meta Analysis
7 Rct
7 Clinical Trial
2 Cochrane Review
1 Openfda Safety
B Treatment of gouty arthritis with traditional Chinese medicine decoction: Meta-analysis, network pharmacology analysis, and molecular docking
Meta Analysis Medicine 2024
B Effects of quercetin supplementation on lipid profile: A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Critical reviews in food science and nutrition 2017
B Dietary polyphenols and the risk of metabolic syndrome: a systematic review and meta-analysis
Meta Analysis BMC endocrine disorders 2024
B Quercetin and endurance exercise capacity: a systematic review and meta-analysis
Meta Analysis Medicine and science in sports and exercise 2011
B Dietary flavonoid intake and smoking-related cancer risk: a meta-analysis
Meta Analysis PloS one 2013
B Clinical efficacy evaluation and potential mechanism prediction on Guizhi-Shaoyao-Zhimu decoction in the treatment of gouty arthritis based on meta-analysis, network pharmacology analysis, and molecular docking
Meta Analysis Medicine 2023
B A Systematic Review: Quercetin-Secondary Metabolite of the Flavonol Class, with Multiple Health Benefits and Low Bioavailability
Systematic Review International journal of molecular sciences 2024
B Dietary flavonoid for preventing colorectal neoplasms.
Cochrane Review The Cochrane database of systematic reviews
B Flavonoids for treating venous leg ulcers.
Cochrane Review The Cochrane database of systematic reviews
B The effects of quercetin supplementation on lipid profiles and inflammatory markers among patients with metabolic syndrome and related disorders: A systematic review and meta-analysis of randomized controlled trials
Meta Analysis Critical reviews in food science and nutrition 2020
View all evidence for Quercetin →

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