Vitamin D is often called the "sunshine vitamin" because the body can naturally create it in the skin when exposed to sunlight. This type is called vitamin D3, as opposed to vitamin D, which naturally occurs in some plants, animals, and fungi. Despite the supposed ease of absorbing this vitamin, medical experts estimate about one billion people have vitamin D3 deficiencies. These can develop if a person is not getting outside enough, wears sunblock too often, has more melanin in their skin (darker skin acts as a sun blocker), eats a vegan diet or has milk allergies, or has an underlying condition that causes malabsorption. A variety of symptoms can indicate a vitamin D3 deficiency.
If you're low in vitamin D3, you may feel tired all the time and fatigued even when you're getting a good night's sleep. You may feel like you don't have the energy to keep up with everyday things. Vitamin D3 helps keep the body energized because it works toward good health in so many ways, including keeping the immune system healthy and enabling healing. Several research studies found a correlation between vitamin D deficiency and excessive fatigue. Furthermore, supplementation with vitamin D3 helped improve energy levels.
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