Vitamin D3 is a dietary supplement that promotes the body's absorption of calcium and phosphorous, which are essential for the development and maintenance of healthy teeth and bones.
Scientific evidence links low levels of Vitamin D to an increased risk of:
Scientific studies show that to achieve blood levels of Vitamin D that can protect you against chronic diseases, you need an optimal dose of 1,000 IU of Vitamin D3 a day.5,000 IU
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Vitamin D acts as a hormone in your body. Its tasks include keeping bones strong by boosting their calcium absorption. Vitamin D may also help muscle function. The body makes Vitamin D when exposed to sunlight, but that ability fades with age.
If you get little to no sun exposure, you will need to take more than 2,000 IU per day, how much more depends on your latitude of residence, skin pigmentation, and body weight. Generally speaking, the further you live away from the equator, the darker the skin, and the more you weigh, the more you will have to take to maintain healthy blood levels.
The only way you can know how much Vitamin D to take is by repeatedly getting your blood tested, called a 25 (OH) D test, and seeing what you need to do to keep your level around 50 ng/mL.