These nutrients include a diverse group of products. Some, such as fish oils, are food substances that scientists have concluded possess disease-fighting potential.
Flavonoids, soy isoflavones, and carotenoids are phytochemicals-compounds found in fruits and vegetables that work to lower the risk of disease and may alleviate symptoms of some ailments.
Other nutritional supplements, such as DHEA, melatonin, and coenzyme Q10, are substances present in the body that can be re-created synthetically in a laboratory. A similar example is acidophilus, a friendly bacterium in the body that, taken as a supplement, may aid in the treatment of digestive disorders.
Amino acids, which are building blocks for proteins and may play a role in strengthening the immune system and in other health-promotion activities, have been known to scientists for many years. Only recently, however, have they been marketed as individual dietary supplements.
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