Life Extension's Optimized Quercetin delivers 250 mg of quercetin plus 30 mg of vitamin C per vegetarian capsule, with a food blend from onion, bitter orange, and apple. Designed for cardiovascular support and antioxidant coverage, it pairs well with fisetin in the Dasatinib + Quercetin senolytic protocol. One capsule once or twice daily; 60 capsules per bottle (1–2 month supply).
Quercetin has established antioxidant and anti-inflammatory mechanisms supported by cell and animal studies, and observational data suggest associations with cardiovascular and respiratory outcomes. However, human RCTs show mixed results: some small trials report benefits for exercise performance or upper-respiratory infection incidence, while others find no significant effect. Bioavailability is a known limitation—quercetin is poorly absorbed orally, and most human studies use doses or formulations not typical of dietary intake.
Quercetin is a flavonoid polyphenol that acts as an antioxidant and anti-inflammatory agent, scavenging free radicals and inhibiting NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) signaling. It may also modulate mitochondrial function and has been studied for potential effects on endothelial function, immune response, and cellular senescence.
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Observational
“OBJECTIVE: To evaluate safety and efficacy of dietary polyphenols in the treatment of rheumatoid arthritis (RA).”
“PROBLEM: Women with PCOS have a reduced total antioxidant level in addition to higher oxidative stress.”
“BACKGROUND: Consumption of flavonoid-rich foods such as cocoa and tea may reduce cardiovascular disease risk.”
“Author information: (1)Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China.”
Most human trials are small (N < 100) and underpowered. Bioavailability varies widely depending on formulation and food matrix; free quercetin has very low oral absorption (~1-2%), though some formulations claim improved delivery. Positive findings are often modest and inconsistent across studies. No robust evidence for longevity or age-related disease prevention in humans. Observational associations may reflect confounding (quercetin-rich foods correlate with overall diet quality). Long-term safety data in supplemental doses are limited.
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