Resveratrol

Resveratrol is a naturally occurring plant polyphenol of the stilbene class, chemically 3,5,4'-trihydroxy-trans-stilbene. It is produced by grapevines, berries, and peanuts as a phytoalexin in response to stress or infection, and is found most abundantly in grape skin and red wine. The trans isomer is the biologically predominant and most studied form. Like many polyphenols, resveratrol is poorly water-soluble and undergoes extensive first-pass glucuronidation and sulfation, giving it low oral bioavailability — a limitation that has driven formulation work including nanocarrier systems and spray-dried inhalable powders for pulmonary delivery.

Its biological activity is broadly attributed to antioxidant and anti-inflammatory effects. Resveratrol scavenges reactive oxygen species and supports endogenous antioxidant defenses, including glutathione and glutathione Peroxidase 4 (Gpx4), and it activates Nrf2-driven cytoprotective transcription via the p62-KEAP1-Nrf2 axis, a pathway linked to suppression of ferroptosis. It is widely characterized as an activator of Sirtuin 1 (Sirt1), an NAD+-dependent deacetylase implicated in metabolic regulation, autophagy, and cellular stress resistance, and it engages AMPK signaling in energy and lipid metabolism. Resveratrol also modulates Phosphatidylinositol 3-kinase (PI3K)/Protein kinase B (PKB) and Mtor signaling, dampens NF-κB-driven production of proinflammatory cytokines such as Interleukin-6 (IL-6), and suppresses NLRP3 inflammasome activation with downstream Caspase-1-mediated pyroptosis; effects on Caspase-3-dependent apoptosis and on Transforming growth factor-β1 (TGF-β1)-driven fibrosis have also been described.

These mechanisms underlie preclinical interest across a wide range of conditions. In neuroscience, resveratrol has been studied for neuroprotection in models of Alzheimer's disease, Parkinson's disease, and epilepsy, where oxidative stress, cellular senescence, and impaired autophagy contribute to injury; its capacity to cross the blood-brain barrier is a recurring consideration in this work. Metabolic applications include high-fat-diet obesity models, where thermogenic β3-adrenergic and AMPK signaling has been implicated, alongside longstanding interest in type 2 diabetes and cardiovascular disease. It is also examined in fibrosis and tissue-remodeling settings and for anticancer activity, and is frequently combined with other natural compounds such as curcumin, quercetin, hesperidin, and catechins. Despite extensive preclinical literature, resveratrol remains a dietary supplement rather than an approved drug, and clinical evidence for its benefits is not established.