Hormonal contraceptives (the pill, the patch, and the vaginal ring) all contain a small amount of man-made estrogen and progestin hormones. These hormones work to inhibit the body's natural cyclical hormones to prevent pregnancy. Pregnancy is prevented by a combination of factors.
Definition of STRONTIUM 90. : a heavy radioactive isotope of strontium of mass number 90 that has a half-life of 29 years, that is present in nuclear waste and fallout, and that is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animals.See strontium 90 defined for kids. a heavy radioactive isotope of strontium having the mass number 90 that is present in the fallout from nuclear explosions and is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animalsâcalled also radiostrontium.
Download BONSENSE PDF. Many consumers are lured by the advertised benefits of strontium for bone health. Supplements are increasingly available over the counter and through the Internet. Strontium is a trace element found in seawater and soil and is similar to calcium. A prescription form of strontium (the ranelate salt), known as Protelosâ¢, is currently approved in Europe for the treatment and prevention of osteoporosis because it has been shown to reduce fracture risk. Strontium ranelate has not been approved in the U.S. The forms of strontium available over-the-counter in the U.S. or on the Internet are usually strontium citrate or strontium chloride. These forms are different from the ranelate compound and there have been no studies showing that they are safe or effective.