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Vitamin D is a steroid vitamin, a group of fat-soluble prohormones that are best known for the role they play in supporting bone health and acting in the absorption of calcium and phosphate from the gastrointestinal tract. A growing body of research highlights its important role in supporting other body systems, including cardiovascular and blood sugar balance, musculoskeletal strength and neurologic and immune function, enabled by its ability to target over 200 different genes throughout the body.