It Supports Healthy Aging

As an antioxidant, Resveratrol blocks some of the damage free radicals cause to your cells. Your body is exposed to free radicals from a variety of sources, from chemical pesticides in food or water to sunlight or normal aging.
Oxidative stress is an imbalance caused by free radicals that enter your body in the environment and the antioxidants in your body that try to destroy them. This oxidative stress is responsible for some of the changes that happen as your body ages. Fortunately, studies have highlighted Resveratrol's ability to reduce free radical damage and oxidative stress.

A study published in 2011 evaluated how 20 volunteers responded to Resveratrol and Placebo (a sugar pill) for six weeks. Patients taking Resveratrol had reduced oxidative stress and had lower levels of swelling and redness commonly associated with certain age-related diseases. [1]
In another study, Resveratrol abolished oxidative stress and had neuroprotective effects. [2]

References

[1] Ghanim H, et al. An antiinflammatory and reactive oxygen species suppressive effects of an extract of Polygonum cuspidatum containing resveratrol. J Clin Endocrinol Metab. 2010 Sep;95(9):E1–E8.

[2] Kumar A, et al. Neuroprotective effects of resveratrol against intracerebroventricular colchicine-induced cognitive impairment and oxidative stress in rats. Pharmacology. 2007;79(1):17–26.