2018年3月23日 · This requires the ultraviolet rays from sunlight to form vitamin D3; both the liver and the kidneys are needed to then create the active form of vitamin D. Those with inadequate sun exposure -- including disabled people, infants, the elderly, dark-skinned people, and those who live at northern latitudes during the winter -- are at risk of low ...

Sun induced vitamin D synthesis is greatly influenced by season, time of day, latitude, altitude, air pollution, skin pigmentation, sunscreen use, passing through glass and plastic, and aging. Vitamin D is metabolized sequentially in the liver and kidneys into 25-hydroxyvitamin D which is a major circulating form and 1,25-dihydroxyvitamin D ...

2024年11月26日 · Regular sun exposure is the most natural way to get enough vitamin D, but too much sunlight comes with health risks. This article explains how to safely get vitamin D from the sun.

2022年10月25日 · In the winter, it's virtually impossible to produce vitamin D from the sun if you live 37 degrees above the equator. The 37-degree line cuts across the middle of the United States, skirting a bit ...

It is important to evaluate the role of vitamin D in non-sun-exposed areas to better determine the relationship vitamin D’s protective benefits offer against melanoma . To determine the influence vitamin D may have on the prognosis of patients with melanoma, out of 87 patients with malignant melanoma who were observed in a study, only 11 ...

2 天之前 · Notably, vitamin D intoxication—a potential complication of excessive supplementation—does not occur with skin synthesis, as excess vitamin D is photodegraded into inactive products. It is noteworthy that sunlight exposure is a highly cost-effective method of achieving adequate vitamin D levels, as sunlight is freely available and incurs no ...

A major source of vitamin D for most humans is synthesized from the exposure of the skin to sunlight typically between 1000 h and 1500 h in the spring, summer, and fall.[1,29,33,60] Vitamin D produced in the skin may last at least twice as long in the blood compared with ingested vitamin D. When an adult wearing a bathing suit is exposed to one ...

2024年7月15日 · Vitamin D is essential for bone strength, immune function, and overall health. Sunlight is a natural source of vitamin D, and enjoying just 10 to 15 minutes in the sun each day can help boost your body's vitamin D levels. Factors like skin tone, geography, and sunscreen use can affect how much vitamin D your body produces from the sun.

2019年3月14日 · The sun’s ultraviolet B (UVB) rays interact with a protein called 7-DHC in the skin, converting it into vitamin D3, the active form of vitamin D. The problem is, too many people think that using sunscreen and other forms of sun protection leads to vitamin D deficiency, and that the best way to obtain enough of the vitamin is through ...

2021年1月22日 · The sun is our best natural source of vitamin D. Spending even a short time in the sun can provide the body with all of the vitamin D it needs for the day. According to the Vitamin D Council ...