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Active form (calcitriol) is produced by the kidneys; helps build bone by increasing absorption of calcium from digestive canal into blood; deficiency causes faulty calcification and slows down bone growth; may reduce the risk of osteoporosis but is toxic if taken in high doses; people who have minimal exposure to ultraviolet rays or do not take vitamin D supplements may not have sufficient vitamin D to absorb calcium; this interferes with calcium metabolism

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