Peanuts are among the foods which contain the highest of niacin. People who feed it to their bodies have a lower chance to suffer from Alzheimer's disease or other memory conditions. Niacin found in peanut butter aids in repairing any cell damage in the brain. The p-coumaric acids in peanut butter can also fight cell oxidative stress. This is a common phenomenon that can be seen in neurodegenerative disorders.