Antioxidants and Oxidative Stress: How Resveratrol Fits In

What is oxidative stress?

Your cells constantly produce reactive oxygen species (ROS) — sometimes called free radicals — as a normal by-product of turning food and oxygen into energy. In the right amounts, ROS are useful signals. Problems start when production outpaces your body's ability to neutralize them. That imbalance is oxidative stress, and over time it can damage fats, proteins and DNA.

What raises oxidative stress?

• Normal aging and slowing cellular repair
• Smoking, air pollution and excess UV exposure
• Diets high in ultra-processed foods and low in plants
• Excess body fat and high blood sugar
• Heavy alcohol use, poor sleep and chronic stress
• Being sedentary — although intense exercise briefly raises ROS, regular activity strengthens your defenses

Your built-in antioxidant system

Your body makes powerful antioxidant enzymes — superoxide dismutase, catalase and glutathione peroxidase — plus glutathione itself. These are controlled largely by a master switch called Nrf2. Dietary antioxidants (vitamin C, vitamin E, polyphenols) add to this system.

Why "more antioxidants" isn't the whole story

For years, the idea was simple: take high doses of antioxidant vitamins and mop up free radicals. But large trials of high-dose vitamin E and beta-carotene were disappointing, and some showed harm in certain groups. The lesson: the body needs balance, not maximum suppression of ROS. Some of the benefits of exercise, for example, depend on short bursts of ROS signaling.

How resveratrol works differently

Resveratrol can neutralize some free radicals directly, but that's not thought to be its main effect, because blood levels of free resveratrol are low. Instead, research suggests it acts as a signal: it activates Nrf2 and other pathways (including sirtuins and AMPK) that encourage cells to produce more of their own antioxidant enzymes and to dampen inflammatory signaling. This "help the body help itself" approach fits better with what we now know about oxidative balance.

In human research, the 2024 systematic review found that resveratrol consistently reduced inflammatory markers across trials — inflammation and oxidative stress go hand in hand. Studies have also measured markers of oxidative damage and antioxidant capacity, with generally favorable but varied results.

Food first: polyphenol-rich choices

• Berries, red grapes and pomegranate
• Leafy greens, broccoli and colorful vegetables
• Nuts, seeds, beans and lentils
• Green tea, coffee, cocoa and extra-virgin olive oil
• Herbs and spices such as turmeric, rosemary and oregano

Food gives you hundreds of compounds that work together. Food sources of resveratrol are small, though, which is why people who want a research-level amount use a supplement such as the SelfPlus supplement AGE+.

Lifestyle habits that improve oxidative balance

Regular moderate exercise, good sleep, not smoking, sun protection, managing weight and blood sugar, and limiting alcohol all help your body stay in balance. Resveratrol is best thought of as one supportive layer on top of these.

Sources: Brown K, et al. “Resveratrol for the Management of Human Health: How Far Have We Come? A Systematic Review of Resveratrol Clinical Trials.” Int J Mol Sci 2024;25(2):747. General reviews on Nrf2 signaling and antioxidant supplementation trials. Not medical advice.

Quick questions

Are antioxidant supplements bad for exercise?

Very high doses of some antioxidant vitamins have blunted certain training adaptations in studies. Moderate doses of polyphenols like resveratrol are thought to work differently, by supporting your own defenses, but the research is still developing.

How do I know if I have oxidative stress?

There's no single routine test. Doctors look at overall risk factors such as blood sugar, cholesterol, blood pressure, weight, smoking and inflammation markers.

Is resveratrol a strong antioxidant?

In a test tube, yes. In the body, its main value is thought to come from signaling effects that boost your own antioxidant enzymes rather than from directly mopping up free radicals.