From Wikipedia -
"Peanut butter may protect against a high risk of cardiovascular disease due to high levels of
monounsaturated fats and reveratrol; butter prepared with the skin of the peanuts has a greater level of resveratrol and other health-aiding agents. Peanut butter (and peanuts) provide protein, vitamins B3 and E magnesium, folate, dietary fibre, arginine, and high levels of the antioxidant p-coumaric acid."
And it can also be used to help get chewing gum out of your hair!!!
And it tastes great in toasted sandwiches...