Human body converts cholesterol into vitamin D by absorbing sunlight. Minimized exposure to sunlight or decreased intake of vitamin D-rich foods like fish, meat, eggs and dairy products can create a vitamin D deficit. Adding Nature's Bounty D3 Vitamin Supplement to daily nutrition intake can help cover up the deficiency and make bones strong. With the appropriate level of vitamin D3 present in body, the absorption process of calcium also increases. As a result, taking this vitamin D3 supplement can help support the health of teeth, bones, immune and neuromuscular system.