Resveratrol

Resveratrol is a polyphenol from grapes and red wine, sold in supplements for memory and focus. Studies have not shown convincing benefit for this use: it does not meaningfully improve attention or memory in people. What actually supports memory and concentration is sleep, physical activity, and keeping blood pressure and blood sugar in check; for persistent complaints, see a doctor.

Resveratrol is a polyphenol found in grapes and red wine, added to eye-health supplements and marketed as a way to protect the retina and support vision. Studies have not shown a convincing benefit for this use, and there is no solid evidence that it improves eyesight. For age-related retinal changes, what actually helps is different: regular check-ups with an ophthalmologist, control of blood pressure and blood sugar, and in some cases specific vitamin formulas with a proven composition chosen by a doctor. The substance itself is harmless in this role, but do not take it in place of prescribed treatment, since that risks missing care that genuinely works.

Resveratrol gained the «longevity molecule» label after Sinclair-group work in the early 2000s – in lab models it activated the sirtuin SIRT1 and extended lifespan in yeast and nematodes. The mammalian lifespan effect did not reproduce: mice on normal feeding showed no rise in median survival. EFSA in 2011 rejected all resveratrol health claims – no «cell protection», «heart health» or «brain function» submission passed evaluation. Oral bioavailability is very low: Walle 2011 review reports under 1% of an oral dose reaching plasma unchanged. The Berman systematic review 2017 in Ann N Y Acad Sci found no quality clinical outcomes in humans. If resveratrol was bought or prescribed «for longevity», consider seeking a second opinion; the efficacy is not proven, and real strategies to lengthen healthy lifespan are smoking cessation, BP and glucose control, physical activity, Mediterranean diet and sleep.

For non-clinical fatigue, resveratrol is sold as an «antioxidant with tonic effect». RCTs with validated fatigue scale endpoints (FSS, MFI-20) in healthy adults are unavailable. Resveratrol is absent from international asthenia and chronic fatigue guidelines.