Hazel Nuts are a rich source of mono- and polyunsaturated fats and contain a good amount of omega-6 and omega-9 fatty acids such as oleic acid. Hazelnuts also contain decent amounts of vitamin B6 folate phosphorus potassium and zinc. Promotes in brain health. Hazelnuts provide significant amounts of antioxidants. Antioxidants protect the body from oxidative stress which can damage cell structure and promote aging cancer and heart disease.