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Vitamin D: A steroid vitamin which promotes the intestinal absorption and metabolism of calcium and phosphorus. Under normal conditions of sunlight exposure, no dietary supplementation is necessary because sunlight promotes adequate vitamin D synthesis in the skin. Deficiency can lead to bone deformity (rickets) in children and bone weakness (osteomalacia) in adults.

How get vitamin D:Vitamin D comes from the diet (eggs, fish, and dairy products) and is produced in the skin. Skin production of the active form of vitamin D depends on exposure to sunlight. Active people living in sunny regions produce most of the vitamin D they need from their skin. In less sunny climes the skin production of vitamin D is markedly diminished in the winter months, especially among the elderly and the housebound. In that population, vitamin D supplements become important.

Effects of vitamin D on skin and bones:Your skin is your body's largest organ, and the skin is much more closely linked to your overall health than many people even realize. But given the risks of sun exposure and skin cancer, INSIDER asked our experts to explain how we can safely expose our skin to the sun to reap the benefits of natural vitamin D without damaging our skin, and they gave us the scoop.The sun is an "important source for vitamin D in a person who does not have a diet rich in these foods,"

 Vitamin D has many important jobs in your body. It keeps your bones strong by helping your body absorb calcium and phosphorus, key minerals for bone health. Your muscles use it to move, and nerves need it to carry messages throughout your body.Vitamin D is necessary for strong bones and muscles. Without Vitamin D, our bodies cannot effectively absorb calcium, which is essential to good bone health.

Children who lack Vitamin D develop the condition called rickets, which causes bone weakness, bowed legs, and other skeletal deformities, such as stooped posture.

Today, doctors are seeing an increase in the number of children with rickets. This article focuses on the reasons for the increase and things parents can do to improve their children's bone health — as well as their own.