What it's actually good for
Resveratrol is perhaps the most famous example of longevity hype outrunning evidence. The compound — a polyphenol found in grape skins, red wine, and berries — became a media sensation after early research suggested it could activate sirtuins and extend lifespan in model organisms. The "French paradox" narrative (low heart disease despite high-fat diets, attributed to red wine) added cultural cachet. However, human translational research has been largely disappointing. Bioavailability is very poor, meaning most oral resveratrol is rapidly metabolized before reaching target tissues. Large observational studies have found no association between dietary resveratrol intake and reduced mortality or cardiovascular disease in humans. Clinical trials have shown modest effects on some inflammatory markers in specific populations (such as those with type 2 diabetes), but nothing approaching the dramatic benefits seen in animal models. The gap between the resveratrol story and the resveratrol evidence is wide, and honest assessment puts this firmly in the "interesting but unproven" category.