Vitamin D3 (calciferol) is a fat-soluble vitamin so critical to human health that our skin manufactures it in response to sun exposure. Its role in bone health is well-documented but vitamin D3 receptors are also present and active in a variety of tissues outside of bones, such as in heart muscle cells and arterial muscle cells. This would suggest that vitamin D3 plays a significant role in proper cardiovascular function and blood pressure. In addition, it appears that vitamin D3 improves immune function by increasing the production of anti-microbial proteins that provide a natural defense against disease-causing bacteria and viruses.
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