Yes
Lanthanum is usually found only in two different kinds of ores. World production of lanthanum oxide in around 12.000 tonnes per year, and currently nown reseves of lanthanum are around 6 million tonnes. The use of lanthanum is still growing, due to the fact that it is suited to produce catalysers and to polish glass. Lanthanum is one of the rare chemicals, that can be found in houses in equipment such as colour televisions, fluorescent lamps, energy-saving lamps and glasses. All rare chemicals have comparable properties. La 2 O 2 is used to make special optical glasses (infrared adsorbing glass, camera and telescope lenses). Roughly 96 percent of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen and nitrogen, with a lot of that in the form of water. The remaining 4 percent is a sparse sampling of the periodic table of elements. In the human body,the absolute bioavailability of lanthanum (administered as lanthanum carbonate) wasalso extremely low (0.00127% ± 0.00080%), with individual values in the range of0.00015% to 0.00224% (Pennick et al. , 2006). Lanthanum is used to reduce blood levels of phosphate in patients with kidney disease. High levels of phosphate in the blood can cause bone problems. Lanthanum is in a class of medications called phosphate binders. It works by preventing absorption of phosphate from food in the stomach. Lanthanum is found in ‘rare earth’ minerals, principally monazite (25% lanthanum) and bastnaesite (38% lanthanum). Ion-exchange and solvent extraction techniques are used to isolate the ‘rare earth’ elements from the minerals. Lanthanum metal is usually obtained by reducing the anhydrous fluoride with calcium. Lanthanum. Lanthanum is a soft, malleable, ductile, silver-white metal. It is chemically active, it is one of the most reactive of the rare-earth metals: it oxidizes rapidly in air and it reacts with water to form the hydroxide.
http://www.lenntech.com/periodic/elements/la.htm http://www.lenntech.com/periodic/elements/la.htm http://www.livescience.com/3505-chemistry-life-human-body.html http://www.phoslock.com.au/irm/content/scientificreport/lanthanum-and-human-toxicity.pdf https://www.nlm.nih.gov/medlineplus/druginfo/meds/a605015.html http://www.rsc.org/periodic-table/element/57/lanthanum http://www.lenntech.com/periodic/elements/la.htm
is lanthanum found in the human body