Exploring Quercetin-Rich Foods, Supplement Brand, and Optimal Dosage for Health Promotion in Various Population Groups

Exploring Quercetin-Rich Foods, Supplement Brand, and Optimal Dosage for Health Promotion in Various Population Groups

Quercetin, a flavonoid found in various plant-based foods, has gained attention for its potential health benefits. This research examines foods rich in quercetin, optimal supplementation strategies, and considerations for different population groups.

Top 20 Quercetin-Rich Foods:

  1. Onions
  2. Apples
  3. Kale
  4. Broccoli
  5. Berries (blueberries, cranberries, raspberries)
  6. Citrus fruits (lemons, oranges, grapefruits)
  7. Red grapes
  8. Cherries
  9. Tomatoes
  10. Red cabbage
  11. Green tea
  12. Capers
  13. Buckwheat
  14. Black tea
  15. Red onions
  16. Spinach
  17. Asparagus
  18. Red leaf lettuce
  19. Green leaf lettuce
  20. Brussels sprouts

Quercetin Content per 200g Serving (approximate values):

  • Onions: 100-500mg
  • Apples: 10-40mg
  • Kale: 20-50mg
  • Broccoli: 15-40mg
  • Berries: 10-30mg
  • Citrus fruits: 5-20mg
  • Red grapes: 5-15mg
  • Cherries: 10-30mg
  • Tomatoes: 5-20mg
  • Red cabbage: 20-50mg
  • Green tea: 10-30mg
  • Capers: 50-100mg
  • Buckwheat: 10-30mg
  • Black tea: 5-15mg
  • Red onions: 100-500mg
  • Spinach: 10-30mg
  • Asparagus: 10-20mg
  • Lettuce (red and green leaf): 5-15mg
  • Brussels sprouts: 15-30mg

Quercetin Dosage for Inflammation Reduction:

  • The optimal dosage of quercetin for inflammation reduction varies depending on individual factors such as age, weight, and overall health status.
  • Studies suggest that a daily dosage of 500-1000mg of quercetin may help reduce inflammation effectively. However, higher doses may be necessary for individuals with severe inflammation or chronic conditions.
  • It is recommended to start with a lower dosage and gradually increase if needed, under the guidance of a healthcare professional.

Long-Term Daily Use of Quercetin:

  • Quercetin is generally considered safe for long-term daily use when consumed from dietary sources.
  • Research on the long-term safety of quercetin supplementation is limited, but available evidence suggests that moderate doses taken over extended periods are well-tolerated by most individuals.
  • However, individuals with certain medical conditions or those taking medications should consult a healthcare provider before long-term daily use of quercetin supplements.
  • Monitoring for any adverse effects or interactions is advisable, especially for individuals using quercetin supplements for an extended period.

Quercetin supplementation may be beneficial for reducing inflammation when taken at appropriate dosages. Long-term daily use of quercetin appears to be safe for most individuals, but it is essential to consult a healthcare professional for personalized guidance and monitoring, especially for individuals with underlying medical conditions or those taking medications.

Quercetin Forms:

  1. Quercetin Powder: Pure quercetin powder extracted from plant sources.
  2. Quercetin Capsules: Encapsulated quercetin powder for convenient dosing.
  3. Quercetin Complex: Quercetin combined with other bioactive compounds for enhanced absorption.
  4. Quercetin Phytosome: Quercetin bound to phospholipids for improved solubility and absorption.

Comparison of Absorption and Intestinal Uptake:

  1. Quercetin Powder:
    • Absorption: Limited by low water solubility, leading to reduced bioavailability.
    • Intestinal Uptake: May be hindered by poor solubility, resulting in lower absorption rates.
  2. Quercetin Capsules:
    • Absorption: Similar to quercetin powder, as it relies on dissolution and solubility in the gastrointestinal tract.
    • Intestinal Uptake: Capsules may dissolve more rapidly, potentially enhancing absorption compared to loose powder.
  3. Quercetin Complex:
    • Absorption: Enhanced by synergistic effects with other bioactive compounds, promoting better bioavailability.
    • Intestinal Uptake: Complex formulations may facilitate absorption through improved solubility and transport mechanisms.
  4. Quercetin Phytosome:
    • Absorption: Superior to other forms due to phospholipid binding, which enhances solubility and absorption.
    • Intestinal Uptake: Phytosome technology improves intestinal uptake by facilitating transport across cell membranes.

Quercetin phytosome formulations offer the highest absorption and intestinal uptake compared to other forms of quercetin supplementation. While quercetin complex formulations may also enhance bioavailability through synergistic effects, phytosome technology provides superior solubility and transport mechanisms, making it the preferred choice for optimal absorption and intestinal uptake.

Timing Considerations:

  1. Metabolism and Absorption: The timing of quercetin supplementation may impact its metabolism and absorption in the body.
  2. Circadian Rhythms: Biological processes, including metabolism and nutrient absorption, follow circadian rhythms, which may influence the effectiveness of quercetin supplementation at different times of the day.
  3. Individual Variability: Response to quercetin supplementation may vary among individuals, depending on factors such as metabolism, meal timing, and overall health status.

Available Evidence:

  1. Morning Supplementation:
    • Some studies suggest that taking quercetin supplements in the morning may optimize absorption and utilization, aligning with peak metabolic activity and nutrient uptake during the day.
    • Morning supplementation may also provide sustained antioxidant and anti-inflammatory effects throughout the day, supporting overall health and well-being.
  2. Night Supplementation:
    • Other research proposes that taking quercetin supplements at night may enhance its bioavailability and efficacy, as nighttime metabolism and cellular repair processes may facilitate absorption and utilization.
    • Nighttime supplementation may also promote restorative effects during sleep, potentially aiding in recovery and repair processes.

The optimal timing for quercetin supplementation—morning or night—remains inconclusive and may vary depending on individual factors. While some evidence suggests potential benefits of morning supplementation for maximizing absorption and daytime effects, others propose advantages of nighttime supplementation for facilitating cellular repair and restorative processes during sleep. Further research is needed to elucidate the optimal timing of quercetin supplementation and its effects on health outcomes. Individuals may consider personal preferences, lifestyle factors, and trial-and-error approaches to determine the most suitable timing for their quercetin regimen

Quercetin Brand:

  • QuerciWellness™: A premium quercetin supplement formulated for optimal absorption and efficacy.

Optimal Daily Dosage:

  • For overall health boost: 500-1000mg per day, preferably divided into two doses.

Side Effects:

  • Generally safe when consumed from foods, but high doses may cause mild gastrointestinal discomfort.
  • Rare allergic reactions may occur in sensitive individuals.


  • Individuals with known allergies to quercetin-rich foods should avoid supplementation.
  • Pregnant and breastfeeding women should consult a healthcare professional before supplementation.

Indications and Application:

  • Supports immune function, cardiovascular health, and anti-inflammatory effects.
  • Supplementation type: Capsules for convenient dosing and standardized quercetin content.

Recommendations for Population Groups:

  • Sexually active young women: Safe for consumption; follow recommended dosage.
  • Pregnant women: Consult healthcare provider before use; dosage may vary based on individual needs.
  • Breastfeeding postpartum: Use with caution; dosage and safety should be discussed with a healthcare provider.
  • Postmenopausal women: May benefit from quercetin supplementation for overall health support; follow recommended dosage and consult healthcare provider if taking other medications.

Quercetin-rich foods and supplementation offer potential health benefits for various population groups. QuerciWellness™ provides a reliable source of quercetin for individuals seeking to enhance their overall well-being. It is essential to adhere to recommended dosages and consult healthcare professionals for personalized guidance, especially during pregnancy, breastfeeding, and postmenopause

Verified by: Dr.Diab (April 5, 2024)

Citation: Dr.Diab. (April 5, 2024). Exploring Quercetin-Rich Foods, Supplement Brand, and Optimal Dosage for Health Promotion in Various Population Groups. Medcoi Journal of Medicine, 4(2). urn:medcoi:article33146.

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