Quercetin penetrates the blood-brain barrier and is measurable in brain tissue within hours of oral dosing in animal studies. Its neuroprotective profile encompasses: inhibition of microglial neuroinflammation, activation of the Nrf2/HO-1 antioxidant pathway, BDNF upregulation, protection against glutamate excitotoxicity, and senolytic clearance of p16-positive senescent neurons and glia.

Which is better for brain health: quercetin or fisetin?

Fisetin has demonstrated superior blood-brain barrier penetration and more direct evidence for neuroprotection in Alzheimer's models. Quercetin complements via neuroinflammation control. Combining both provides broader neuroprotective coverage.

How does quercetin compare to standard Alzheimer's drugs for brain protection?

Quercetin is not a treatment for established Alzheimer's disease. Current FDA-approved drugs (donepezil, memantine, aducanumab) have different mechanisms. Quercetin is appropriate as a preventive/supportive supplement, not as primary treatment.