BOTANICALS
Quercetin (dihydrate)
Quercetin is a plant flavonoid antioxidant that supports immune function and seasonal comfort.
Also known as: quercetin dihydrate, flavonoid quercetin
At a glance
- Form
- Quercetin dihydrate
- Category
- Botanicals
- In an apiece formula
- 500 mg a day (you can change it)
- Recommended intake
- No recommended intake (not an essential nutrient)
- Upper limit
- No established UL
- Studied for
- Immune support, Healthy aging*
- Reference
- NIH ODS: Dietary Supplements for Exercise and Athletic Performance fact sheet
Who should be careful
Our safety rules leave quercetin out of a formula, or keep the amount lower, with:
Medicines and supplements
- Warfarin
- Other blood thinner
- Digoxin
- Multiple sclerosis medicine
- Chemotherapy or targeted cancer pills
- Radiation therapy
- Cancer immunotherapy
- Tamoxifen or toremifene
- Aromatase inhibitor
- Other estrogen-blocking cancer treatment
- Anti-rejection medicine
- Mycophenolate, azathioprine or leflunomide
- Methotrexate
- Biologic or JAK inhibitor
- Steroid pills or shots
- and 1 more
Procedures
- Dialysis
Health conditions
- Breast cancer or another estrogen-sensitive cancer
- Chronic kidney disease
- Advanced kidney disease
- Endometriosis, adenomyosis or fibroids
Life stage
- Pregnancy
- Breastfeeding
- Trying to conceive
Always check with your doctor or pharmacist before adding a supplement if you take medication, are pregnant or nursing, or have a health condition. Stay under the upper limit from all sources combined, including multivitamins.
Questions
How much quercetin a day?
apiece formulas usually include 500 mg a day. The recommended intake for adults is No recommended intake (not an essential nutrient). Upper limit: No established UL.
What is quercetin used for?
Quercetin is a plant flavonoid antioxidant that supports immune function and seasonal comfort. In apiece it is part of formulas for Immune support, Healthy aging.*
Who should be careful with quercetin?
apiece’s safety rules leave it out or limit it with: Warfarin; Other blood thinner; Digoxin; Multiple sclerosis medicine; Chemotherapy or targeted cancer pills; Radiation therapy; Cancer immunotherapy; Tamoxifen or toremifene; Aromatase inhibitor; Other estrogen-blocking cancer treatment and others. Check with your doctor or pharmacist if any apply to you.
Can I get quercetin in a personalized supplement?
Yes. apiece builds one daily blend around your goals and, if you have them, your lab results. Quercetin can be part of it at the amount listed, with every ingredient shown and never more than 10 capsules a day.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page is general information, not medical advice. Check with your doctor or pharmacist before starting a supplement, especially if you take medication, are pregnant or nursing, or have a health condition. Updated 2026-10-21.