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The upper limit (UL) for vitamin D has been recommended as 2,000 IU daily due to toxicities that can occur when taken in higher doses.
(PS -- I agree with RD about this being spam. It's soooooo obvious. Science fiction? [] Haha!)
Ignorance is bliss. My doctor has me on 4000 IU a day of vitamin D. My deficiency is due to my body's inability to properly absorb Vitamin D as a result of other medications and a hormonal imbalance that results. Many people with arthritis have a Vitamin D deficiency.
Wikipedia is a poor way to become an expert on a subject.
a service of the US National Library of Medicine and National Institutes of Health
Vitamin D ToxicityUsually, vitamin D toxicity results from taking excessive amounts. Marked hypercalcemia commonly causes symptoms. Diagnosis is typically based on elevated blood levels of 25(OH)D. Treatment consists of stopping vitamin D, restricting dietary Ca, restoring intravascular volume deficits, and, if toxicity is severe, giving corticosteroids or bisphosphonates.Because synthesis of 1,25(OH)2D (the most active metabolite of vitamin D) is tightly regulated, vitamin D toxicity usually occurs only if excessive doses (prescription or megavitamin) are taken. Vitamin D 1000 μg (40,000 IU)/day produces toxicity within 1 to 4 mo in infants. In adults, taking 1250 μg (50,000 IU)/day for several months can produce toxicity. Vitamin D toxicity can occur iatrogenically when hypoparathyroidism is treated too aggressively (see Fluid and Electrolyte Metabolism: Treatment).SymptomsThe main symptoms result from hypercalcemia. Anorexia, nausea, and vomiting can develop, often followed by polyuria, polydipsia, weakness, nervousness, pruritus, and eventually renal failure. Proteinuria, urinary casts, azotemia, and metastatic calcifications (particularly in the kidneys) can develop ...Kidney damage or metastatic calcifications, if present, may be irreversible.Last full review/revision April 2007 by Larry E. Johnson, MD, PhDContent last modified April 2007
QuoteVitamin D ToxicityBecause synthesis of 1,25(OH)2D (the most active metabolite of vitamin D) is tightly regulated, vitamin D toxicity usually occurs only if excessive doses (prescription or megavitamin) are taken. Vitamin D 1000 μg (40,000 IU)/day produces toxicity within 1 to 4 mo in infants. In adults, taking 1250 μg (50,000 IU)/day for several months can produce toxicity. Vitamin D toxicity can occur iatrogenically when hypoparathyroidism is treated too aggressively (see Fluid and Electrolyte Metabolism: Treatment).Content last modified April 2007http://155.91.16.2/mmpe/sec01/ch004/ch004k.html
Vitamin D ToxicityBecause synthesis of 1,25(OH)2D (the most active metabolite of vitamin D) is tightly regulated, vitamin D toxicity usually occurs only if excessive doses (prescription or megavitamin) are taken. Vitamin D 1000 μg (40,000 IU)/day produces toxicity within 1 to 4 mo in infants. In adults, taking 1250 μg (50,000 IU)/day for several months can produce toxicity. Vitamin D toxicity can occur iatrogenically when hypoparathyroidism is treated too aggressively (see Fluid and Electrolyte Metabolism: Treatment).Content last modified April 2007
I won’t turn this into a urinating match, because I respect people and what ails them. I am not an MD, but I’ve studied enough biochemistry and molecular biology to know what’s what, pretty much. I know some doctors whose opinions are worthless.