A chemical element found naturally in seawater and in many foods that is needed to produce thyroid hormone Iodized table salt has had iodine added to it
A nonmetallic element, of the halogen group, occurring always in combination, as in the iodides
Iodine is an element required in small amounts for healthy growth and development An adult body contains about 30 mg of iodine, mostly concentrated in the thyroid gland where it is needed to synthesize thyroid hormones
A trace element found in seawater necessary in small quantities for some reef invertebrates, particularly corals and clams
A sanitizing agent similar in use to chlorine Not widely used because relatively weak, cannot be stabilized, and tends to turn water greenish-yellow or even brown
{i} nonmetallic element of the halogen group used in medicine and photography (Chemistry); powdered iodine mixed with ethyl alcohol to form an antiseptic solution
Optional on nutrition label unless added as a nutrient supplement A mineral Serves as a part of thyroid hormones Helps regulate how fast the body uses energy RDI = 150 mcg
The heaviest nonradioactive halogen, it is a nearly black crystalline solid (diatomic molecule I2) that sublimes (see sublimation) to a deep violet, irritating vapour. It is never found in nature uncombined. Its sources (mostly in brines and seaweeds) and compounds are usually iodides; iodates (small amounts in saltpeter) and periodates also occur. Dietary iodine is essential for thyroid gland function; in areas of the world where food contains insufficient iodine, an iodine compound such as potassium iodide (KI) is added to table salt (sodium chloride) to prevent iodine deficiency. Elemental iodine is used in medicine, in synthesizing some organic chemicals, in manufacturing dyes, in analytical chemistry (see analysis) to measure fat saturation (see hydrogenation) and to detect starch, and in photography. The radioactive isotope iodine-131 (see radioactivity), with an eight-day half-life, is very useful in medicine (see nuclear medicine) and other applications
The condition of the hair, skin, & teeth are dependent upon a well-functioning thyroid gland
When isolated it is in the form of dark gray metallic scales, resembling plumbago, soft but brittle, and emitting a chlorinelike odor
a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic
What it's good for: Making thyroid hormones that control metabolism Where you get it: Lobster, shrimp, bread, milk and iodized salt RDA: 150 mcg for adults
a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
A trace element necessary to life in very small quantities, but deadly at higher concentrations Because it is removed by protein skimming, it must be added regularly on skimmed tanks It is especially needed by crustaceans to successfully molt and soft corals for growth