Vitamin D3 helps the body maintain overall wellness while preventing the development of certain diseases, according to WebMD. The human body produces vitamin D3 after being exposed to sunlight, and also absorbs the vitamin from fortified cereal products, dairy and fish.
Studies have shown that vitamin D3 slows the growth of cancer cells and lowers high blood pressure. Vitamin D3 can also reduce a person's chances of developing multiple sclerosis. The vitamin is known for its bone strengthening effects, as it helps the body process calcium. An adequate vitamin D3 intake is necessary to avoid osteoporosis and rickets. The vitamin also helps the body to process insulin, helping to ease or prevent the symptoms of type I and type II diabetes, reports WebMD.
Vitamin D3 deficiency can cause bone pain and weakness. It is also linked to cancer, asthma, heart disease and cognitive impairment. People who spend a lot of time indoors are at risk because of limited exposure to sunlight. Darker-skinned adults might also be at risk because darker skin absorbs less of the vitamin. Vegans are considered at risk because this group avoids eating dairy products. People who are obese or suffering from a kidney or digestive problem might also have trouble absorbing the vitamin, according to WebMD.