Dietary supplements include vitamins, minerals, herbs, botanicals, enzymes, amino acids, or other dietary ingredients. You take these products by mouth in pill, capsule, tablet, or liquid form to supplement your diet. Functional foods are foods that have a potentially positive effect on health beyond basic nutrition. Proponents of functional foods say they promote optimal health and help reduce the risk of disease. ... An example is orange juice that has been fortified with calcium for bone health. Functional foods can be those whole, fortified, enriched or enhanced foods that provide health benefits beyond the provision of essential nutrients (e.g., vitamins and minerals), when they are consumed at efficacious levels as part of a varied diet on a regular basis.