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Does the Sun Give off Vitamins?

Vitamin D is synthesized in the skin when the body is exposed to ultraviolet-B (UVB) rays found in sunlight. Vitamin D is essential to the body, as it maintains normal blood levels of calcium and phosphorus in the body. Studies also suggest that vitamin D helps ward off depression and helps prevent osteoporosis, high blood pressure, cancer and certain immune disorders.

  1. Vitamin D

    • The primary function of vitamin D is to maintain normal levels of calcium and phosphorus in the body. However, vitamin D also aids in the absorption of calcium, which helps maintain a strong skeletal system and healthy bones. Additionally, two studies presented at the 26th annual meeting of the American Society for Bone and Mineral Research suggest that vitamin D may also protect against osteoporosis, since osteoporosis is strongly associated with low levels of vitamin D. Further, studies conducted at the Linus Pauling Institute of Oregon State University suggest vitamin D may help protect against high blood pressure, cancer and certain autoimmune diseases.

    Synthesis

    • Vitamin D is produced endogenously when UV-B rays from sunlight hit unexposed skin. As soon as the sunlight reaches the skin, it triggers vitamin D synthesis.

    Depression

    • A study by the Washington University School of Medicine suggests vitamin D helps ward off depression and unfavorable changes in mood. For example, Seasonal Affective Disorder (SAD) is a type of depression that is caused by a lack of sunlight. SAD generally occurs during the winter months, particularly in cold climates, when there is little to no sunlight. For this reason, vitamin D is commonly referred to as the "happy vitamin."

    Exposure

    • The Center for Science For the Public Interest recommends that the body, particularly the hands, face and arms, be exposed to the sun without sunscreen for approximately 10 to 15 minutes, two to three times a week. Sun exposure should occur between the hours of 8 a.m. and 4 p.m. Clouds, fogs and other climate elements affect the level and intensity of sun exposure.

    Food Sources

    • Vitamin D can also be found in fish, seafood, eggs, fortified dairy products, fortified cereals, cod liver oil, beef and vitamin supplements.

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