Hazelnut coffee can have some health benefits thanks to the added hazelnuts which are rich in healthy fats, fibre, manganese, magnesium, and vitamin E. Hazelnuts are a source of antioxidants, help maintain good heart health and have anti-cancerous properties. Hazelnut coffee, however, may be high in calories, depending on how much sugar or syrup is added, and if it contains dairy and dessert sauces.