Researchers at Northumbria University gave 24 healthy adults either placebo, 500mg of resveratrol, or 1000mg of resveratrol. Cognitive tests were given prior to the administration of either the placebo or resveratrol. The subjects given the resveratrol showed a significant increase in blood flow to the brain and performed better on the cognitive related tests.
| Content in selected foods | ||
| Food | Serving | Total resveratrol (mg) |
| Peanuts (raw) | 1 c (146 g) | 0.01 - 0.26 |
| Peanuts (boiled) | 1 c (180 g) | 0.32 - 1.28 |
| Peanut butter | 1 c (258 g) | 0.04 - 0.13 |
| Red grapes | 1 c (160 g) | 0.24 - 1.25 |