1) Nutraceuticals are foods or food components that provide health benefits, including the prevention and treatment of disease. They range from isolated nutrients, dietary supplements, specific diets, and herbal products.
2) There is a slight difference between functional foods and nutraceuticals - functional foods provide nutrients for healthy survival when prepared intelligently, while nutraceuticals aid in disease prevention/treatment.
3) Common types of nutraceuticals include dietary supplements, functional foods, medicinal foods, and pharmafoods. Probiotics, prebiotics, and antioxidants are also considered nutraceuticals.