Human impact associated with molybdenum environmental contamination involves mainly combustion of fossil fuels, mining, and metallurgy. Ratios exceeding 15:1 may cause chronic copper poisoning. The disease occurred in Armenians living in areas rich in molybdenum, which produced hyperuricemia, arthralgias, erythema, edema, and deformity of the knees, hands, and feet. If the ratio is less than 2:1, molybdenum toxicity will occur. A low order of toxicity of molybdenum compounds has been observed in humans. 1999;50(3):289-297. of toxicity of molybdenum compounds has been observed in humans. Molybdenum poisoning: A type of heavy metal poisoning caused by excessive exposure to molybdenum. In an attempt to define a tolerable daily intake (TDI) for molybdenum based on a toxicological risk analysis approach, a large literature survey was conducted. Because molybdenum toxicity is associated with copper intake or depleted copper stores in the body, humans who have an inadequate intake of dietary copper or some dysfunction in their copper metabolism that makes them copper‐deficient could be at greater risk of molybdenum toxicity. Excessive intake of molybdenum can cause copper deficiency, which may lead to anemia. Little data on human toxicity of molybdenum are available; however, in 1961, a goutlike syndrome was associated with excessive exposure (10–15 mg day −1) to molybdenum. Excessive intake however, of more than 10 mg daily over a long period has been linked to gout-like symptoms such as pain and swelling of joints. Massive molybdenum exposure in … Arh.Hig.Rada Toksikol. In man, absorption of molybdenum after oral intake is in the range of 28–77% and urinary excretion is 17–80% of the total dose. Symptoms of Molybdenum poisoning These results are more realistic in showing the susceptibility and the risk birds are exposed to when it comes to environmental molybdenum. In humans, absorption of molybdenum after oral intake is in the range of 28-77% and urinary excretion is 17-80% of the total dose. However, with the available data, it is not possible to calculate any dose–response or dose–effect relationships. The high prevalence of articular effects in Armenian villages was associated with a significant ingestion of molybdenum, which caused a disorder of the metabolism of uric acid. Molybdenum compounds have low toxicity towards humans but there are not enough data to calculate any dose-response or dose-effect relationships. Dietary Sources of Molybdenum More detailed information about the symptoms, causes, and treatments of Molybdenum poisoning is available below.. A case report of acute human molybdenum toxicity from a dietary molybdenum supplement--a new member of the "Lucor metallicum" family. Laboratory tests showed high levels of sulfite and xanthine … View abstract. IV-Signs, Symptoms, and Syndromes : A-Acute Toxicity : Molybdenum products may cause toxicity in humans, but adequate studies reporting such effects are lacking. Molybdenum poisoning: Introduction. Molybdenum deficiency resulting in sulfite toxicity occurred in a patient receiving long-term total parenteral nutrition. Though not very well documented, other possible symptoms of molybdenum toxicity involve joint and muscle pain, weakness, fatigue, loose stool and weight loss. In cattle, molybdenum has also been linked to fertility problems. Molybdenum Overdose Symptoms, Toxicity Level & Side Effects Molybdenum is generally considered to be safe as there is little evidence of toxicity even at several times the RDA. Toxicity and bioavailability of both Mo forms were compared. 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