Quercetin inhibits DNA methyltransferases (DNMTs), activates SIRT1 histone deacetylase, and modulates histone acetyltransferase activity — collectively producing epigenetic changes that may partially reverse aging-associated methylation patterns. The implications for biological age clocks (Horvath clock) and aging rate are being actively studied.

Can quercetin reduce biological age as measured by methylation clocks?

There are no published clinical studies measuring epigenetic age clock changes from quercetin supplementation alone. The mechanistic pathways (DNMT inhibition, SIRT1 activation) are directly relevant, but quantitative effects in humans are unknown.

Is quercetin's SIRT1 activation as strong as resveratrol's?

Resveratrol's SIRT1 activation has been extensively studied and debated. Quercetin's SIRT1 activation appears real but less studied in humans. The combination of quercetin + NMN (providing NAD+ substrate) may be more effective than either compound's SIRT1 effects alone.