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
seasonal and immune complaints may ease
Ongoing
antioxidant and mast-cell support
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.
Usage
Entry Dose
250mg
Standard Dose
500–1000mg
Max Dose
2000mg
Onset
2–4 weeks (inflammation/immune)
Combinations
Pairs well with
Synergistic
Zinc — quercetin acts as zinc ionophore, shuttling zinc into cells for antiviral effect
Vitamin C — C regenerates oxidized quercetin; together they extend antioxidant activity
Bromelain — bromelain enhances quercetin absorption and amplifies anti-inflammatory effect
Avoid combining
Contraindicated
Cyclosporine / immunosuppressants — quercetin inhibits CYP3A4; can raise drug blood levels
Quinolone antibiotics — quercetin may reduce absorption of fluoroquinolone antibiotics
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.