Vitamin D3, or cholecalciferol, is a form of vitamin D synthesized in the skin during exposure to ultraviolet-B rays from the sun. The Mayo Clinic states adequate daily intake of vitamin D3 might help prevent some cancers, autoimmune disorders, osteoporosis and certain skin conditions such as psoriasis.
Function
The primary function of vitamin D3 in the body is to help maintain adequate blood levels of phosphorus and calcium.
Recommended Daily Allowance
The Office of Dietary Supplements states teenagers and adults aged 14 to 50 years old require 5 mcg of vitamin D with D3 each day. Men and women aged 51 to 70 years need twice that amount, and those older than 70 require 15 mcg each day.
Sources
Small amounts of vitamin D3 are found in fish flesh, beef liver, egg yolks and some cheeses. Most vitamin D3 is obtained from the sun's UVB rays.
Vitamin D3 Deficiency
A deficiency of vitamin D3 can lead to rickets in children or osteomalacia in adults. Deficiency can also cause hyperparathyroidism, muscle pain, osteoporosis and high blood pressure.
Considerations
Supplementation might be necessary for groups at high risk of vitamin D3 deficiency, including obese persons, breastfed infants, the elderly, patients with Crohn's disease or cystic fibrosis, and anyone who receives limited exposure to sunlight.
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