Resveratrol Ultra contains trans-resveratrol, a plant compound which research suggests can activate siRT1, an enzyme associated with longevity. It also counters the effects of free radicals, speeds up cellular repair, and supports cardiovascular health. Resveratrol Ultra also contains rutin (quercetin rutinoside), a bioflavonoid from Japanese sophora (Sophora japonica) flower bud, which is converted to quercetin in the body. Research suggests that the combination of quercetin and resveratrol provides more support for the immune system than either compound alone.