Quercetin Phytosome
Research Reliability -
A highly absorbable quercetin complex with broad antioxidant, anti-inflammatory, and immune-modulating properties.
Appetite
Mood
Sleep
Quercetin Phytosome
Description
Quercetin is a bioflavonoid found in onions, apples, and capers with extensive research supporting its anti-inflammatory, antihistamine, and antiviral activities. The phytosome delivery system binds quercetin to sunflower lecithin, increasing absorption by up to 20 times compared to standard quercetin powder. It inhibits mast cell degranulation (relevant for allergy sufferers), supports antiviral immune responses, reduces systemic inflammation, and acts as a potent antioxidant across multiple tissues. Quercetin also acts as a zinc ionophore, facilitating zinc entry into cells where it can inhibit viral replication.
Effects
First 2 weeks
subtle
Weeks 2–4
Ongoing
How It Feels
Gentle and slow; allergy-prone people are the group most likely to notice a real benefit over a few weeks. Most others feel little day to day. The phytosome form dramatically improves absorption over standard quercetin.
Evidence
Evidence Strength
Preliminary (limited / small human data)
Caveats
Antiviral and senolytic claims for quercetin are drawn primarily from in vitro and animal research; robust human efficacy trials on these specific outcomes are lacking.
Usage
Commonly Referenced Starting Amount
250 mg phytosome/day
Commonly Referenced Amount
250–500 mg/day phytosome, or 500–1,000 mg/day for plain (non-phytosome) quercetin, reflecting the same bioavailability gap seen with curcumin
Referenced Upper Limit
No upper limit has been established
Onset
2–4 weeks (inflammation/immune)
Biomarkers to Track
Subjective
(Daily)
Allergy symptom severity (1–10)
Frequency of illness
Energy and fatigue levels
Objective
(Quarterly)
hs-CRP (inflammation marker)
Serum zinc level
IgE levels (allergy marker)
Very safe. Very high doses can affect kidney handling and some drug levels.
People on medications processed by the liver should check for interactions.
Using poorly absorbed plain quercetin, and expecting benefit if you are not allergy-prone.
Disclaimer
This information is for educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider before starting any new supplement, especially if you are pregnant, nursing, taking medication, or managing a health condition.
Riva A et al. (2019). European Journal of Drug Metabolism and Pharmacokinetics. Human bioavailability study (Quercetin Phytosome). PMID: 30206797.
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