Pumpkin seeds provide a wide range of traditional nutrients. Our food ranking system qualified them as a very good source of the minerals magnesium, manganese and phosphorous, and a good source of iron, copper, and protein. Because they are rich in zinc, researchers suggest they may have a role in promoting prostate health and preventing osteoporosis. Natural pumpkin seeds are rich in phytosterols, compounds found in plants that have a chemical structure very similar to cholesterol. When present in the diet in sufficient amounts these compounds are believed to reduce blood levels of cholesterol, enhance the immune response, and decrease the risk of certain cancers.