Vitamin D Toxicity

There is no extra benefit from intakes in excess of 200-400 IU/day, the currently recommended intake for infants,children, adolescents and young adults. Intake of 100 μg of vitamin D can cause hypercalcaemia in infants. Hypercalcaemia can cause irreversible damage by calcification of various soft tissues of the body,including the heart,lungs and kidneys. 

Most cases of hypercalcaemia in adults have been caused by vitamin D intakes of 25000 to 60000 IU/day continued over a period of 1-4 months.The first symptoms include loss of appetite, nausea,weight loss and failure to thrive.The early symptoms all disappear quickly as soon as all sources of vitamin D are withdrawn from the diet.If the state of hypercalcaemia is allowed to persist for a long period,however,  the calcification of soft tissues can eventually cause death.

There is no evidence that excessive vitamin D production ever becomes a problem simply as a result of over exposure to sunlight.

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https://en.m.wikipedia.org/wiki/Vitamin_D_toxicity

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