Hydroxytyrosol — The Olive Polyphenol

Hydroxytyrosol is a potent antioxidant that scavenges free radicals and reduces oxidative stress. At the molecular level, it activates the AMPK pathway and upregulates SIRT1, which together promote autophagy, mitochondrial biogenesis, and cellular energy homeostasis. It also activates the Nrf2/HO-1 axis, enhancing the expression of endogenous antioxidant enzymes. Furthermore, hydroxytyrosol inhibits the NF-κB pathway, thereby reducing the production of pro-inflammatory cytokines and mitigating chronic low-grade inflammation associated with aging.

Multiple human trials have demonstrated that hydroxytyrosol supplementation (typically 15–45 mg/day) improves antioxidant capacity, reduces oxidized LDL, and modulates inflammatory markers. However, there are no published human longevity trials directly measuring lifespan extension. Evidence for lifespan extension is currently limited to animal models such as C. elegans.

5–50 mg/day is the most studied range in humans, typically taken orally. Doses of 15–45 mg/day have been used in clinical trials to improve antioxidant status and lipid profiles. It is generally consumed with food, often as an olive extract supplement or within high-phenolic extra virgin olive oil.

Hydroxytyrosol is generally recognized as safe (GRAS) by the FDA at typical dietary and supplemental doses (up to ~50 mg/day). No significant adverse effects have been reported in human trials at these doses. However, due to its potential mild anti-platelet aggregation effects, caution is advised for individuals on blood-thinning medications or those with bleeding disorders.

Key Papers