Deficiency may occur if one does not get enough vitamin D in their diet or has limited exposure to the sun (due to working indoors, avoiding or protecting from the sun, or living in the northern regions of Canada). It can also be associated with an increased susceptibility to infection and autoimmune disease. Deficiency can be associated with loss of bone density, osteoporosis and ‘brittle’ bones, lower back pain, and muscle weakness.

Studies show vitamin D3 is essential for long-term health and it is important to prevent risk of vitamin D deficiency. Vitamin D3 is also required for proper immune function and can modulate both adaptive and innate immune responses. Additionally, when vitamin D is combined with calcium intake and regular weightbearing exercise, it helps reduce the risk of developing osteoporosis. It is required for calcium regulation, by promoting absorption of calcium and phosphorus from the small intestine and kidneys to be deposited in the bones for mineralization.

Vitamin D3 is needed for development, growth, and maintenance of strong bones and teeth.

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