Quercetin stabilises mast cells — the immune cells that release histamine and trigger allergy symptoms. Unlike pharmaceutical antihistamines that block histamine receptors after release, quercetin prevents the release in the first place. Clinical trials show it reduces symptoms of allergic rhinitis, asthma, and eczema.
Beyond mast cells, quercetin has broad anti-inflammatory effects: it inhibits NF-kB, reduces COX-2 and lipoxygenase activity, scavenges free radicals, and modulates cytokine production. This multi-pathway anti-inflammatory action explains its benefits across allergies, cardiovascular disease, and metabolic health.
The combination of quercetin with dasatinib (a cancer drug) is the most studied senolytic therapy in the world. Developed at the Mayo Clinic, this combination selectively kills senescent cells — the zombie cells that accumulate with age and drive inflammation and tissue damage.
In human trials, dasatinib + quercetin reduced senescent cell markers in patients with diabetic kidney disease and idiopathic pulmonary fibrosis. Quercetin's contribution is targeting different senescent cell survival pathways than dasatinib alone, creating a broader senolytic effect. On its own, quercetin has moderate senolytic activity — useful but less potent than the combination.
For allergy and anti-inflammatory support: 500-1000mg daily, preferably split into two doses. For senolytic purposes (experimental): some longevity practitioners use 1000mg for 2-3 consecutive days per month, following the intermittent senolytic protocol. Always take with a fat source for better absorption.
Quercetin's main limitation is poor bioavailability. Phytosome formulations (quercetin bound to phospholipids) dramatically improve absorption. Alternatively, take with bromelain (a pineapple enzyme) which enhances quercetin absorption. Vitamin C also improves quercetin recycling in the body. Side effects are minimal — occasional mild GI upset at high doses. It can interact with certain antibiotics and blood thinners, so consult your doctor if you're on medication.
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