Vitamin D is a precursor hormone and has multiple roles in the human body. It helps to maintain the health of bones and teeth, support the health of the immune system, brain, and nervous system. It also helps regulate insulin levels and aid in diabetes management. Vitamin D also supports lung function and cardiovascular health while influencing the expression of genes involved in cancer development.
Researchers in clinical studies had tested fifty-five adults between 18 and 65 with artificial light sources containing ultraviolet radiation or UV rays. The adults participating in this study were told to sit under a heat lamp or UV light in their underwear for up to 10 minutes. Researchers noticed that their vitamin D levels increased afterward. Of course, buying UV lights or heat lamps and sitting around under those lights in your underwear might not be the best or easiest solution for most people.
It is estimated that sensible sun exposure on bare skin for 5-10 minutes 2-3 times per week allows most people to produce sufficient vitamin D, but vitamin D breaks down quite quickly, meaning that stores can run low, especially in winter. In fact, recent studies have suggested that a substantial percentage of the global population is vitamin D deficient partially because of this.
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