Vitamin D3 Supplement Review

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Vitamin D3
  Evaluated for:
Effectiveness Rating Effectiveness Rating
Prevention and treatment of osteoporosis
+3 (Strong Evidence)
+3 (Strong Evidence)
Vitamin D deficiency
+3 (Strong Evidence)
Prevention of multiple sclerosis
0 (Effectiveness Unclear)
0 (Effectiveness Unclear)
Coronary heart disease
0 (Effectiveness Unclear)
Various cancers
0 (Effectiveness Unclear)
Other conditions which have been associated with vitamin D deficiency
0 (Effectiveness Unclear)


  • Many of these conditions are quite serious. Given that the risk, expense, and side effects of vitamin D3 supplementation are very low, treatment is safe and easy.
  • Given the low cost and low risk of side effects, it seems prudent to take supplemental vitamin D3.
  • Vitamin D levels can be measured, so your doctor can determine exactly how much you need, and then make a recommendation based on the results.


  • Vitamin D3 doesn’t work well when taken alone. It needs to be given in combination with calcium in order to prevent and treat osteoporosis. Even so, the benefit is small.
  • Vitamin D3 supplementation does not always produce reliable clinical improvement or reduce the risk of developing these conditions.
  • Commercially available vitamin D3 preparations do not always contain the actual amount advertised on the label.

Too much vitamin D3 can cause serious toxicity, which can, in rare cases, be life threatening. Ask your medical provider to check your levels. This will help to determine your correct dose.

DOSAGE:Check with your medical provider to help determine your ideal dosage. For everyone over one year of age, a dosage of 2000 IU (50 mcg) daily should not be exceeded.

CONCLUSION:We conclude that vitamin D3 is a safe and effective product for the treatment and prevention of osteoporosis, rickets and vitamin D deficiency. There is not enough evidence to support its use for the other conditions listed above. If you do elect to try it, tell your health care providers. A healthy diet with adequate calcium, Vitamin D, sunshine, and physical activity will help achieve strong bones and may reduce your risk of osteoporosis. Go for a walk outside, or take a winter vacation to a sunny spot!

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