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A growing body of research clearly shows the absolute necessity of vitamin D for good health and disease prevention. However, despite vitamin D’s role in keeping your body ticking along like a well-oiled clock, you are likely deficient in the “sunshine vitamin”—because the majority of people are.

Our vitamin D levels have dropped as a result of being scared sunless by those spreading misinformation that the sun causes melanoma, a myth that survives by mass promotion but really lacks any factual basis. It has been repeated so many times that most people believe it.

Vitamin D affects your biological function by influencing nearly 3,000 of your genes through vitamin D receptors. In fact, vitamin D receptors are found throughout your body, which should come as no surprise, given we humans evolved in the sun.

Recent research has also revealed yet another benefit of sun exposure beyond the protective benefits of producing vitamin D, namely the production of nitric oxide—a compound that lowers your blood pressure.

According to the researchers, the heart-health benefits from this may outweigh the risk of developing skin cancer. Your vitamin D level varies not only with time of day, season, and geographic location, but also with your genetics.

For example, if you have dark skin, you may need up to 10 times more sun exposure to maintain an optimal vitamin D level as a person with pale skin. Redheads have to be particularly careful, as they appear to be genetically predisposed to developing melanoma, regardless of whether or not they spend time in the sun.