For years, calcium by itself has been portrayed as being the key nutrient for bone health. But that is only part of the story. Vitamin D and magnesium are also important. Vitamin D facilitates calcium’s absorption, and magnesium helps keep calcium out of the soft tissues and in the bones where it’s needed most.*

Most studies have found a combination of bone health nutrients to be superior to any single nutrient alone.

For example, a study of fracture risk in postmenopausal women found a decreased risk of fracture in women who took supplemental vitamin D3, but found an even greater decrease in fracture risk when calcium was included.*1

Vitamin D is an important part of the picture – deficiency and insufficiency of vitamin D have both been well documented during the past decade. National survey data indicates that more than 40% of U.S. adults are vitamin D deficient2,3 – defined as less than 20 ng/mL of serum 25(OH)D. On the bright side, data shows that 37% of U.S. adults report taking supplemental vitamin D.2-4

Vitamin D and calcium are not the only nutrients that are dependent on each other for their efficacy.

A recent review published in The Journal of the American Osteopathic Association has determined that vitamin D is not metabolized efficiently without an adequate level of magnesium being present.5

But here’s the issue, according to World Health Organization statistics, as much as 3/4 of the U.S. adult population does not meet the U.S. Food and Drug Administration’s Recommended Daily Intake of magnesium – 420 mg per day.6

It is very clear that individuals who supplement with vitamin D should also consider their magnesium status as well. Failure to maintain an adequate level of magnesium in the body could lead to inadequate vitamin D metabolism.* Furthermore, individuals with an adequate magnesium level were found to require less vitamin D supplementation to maintain a normal level of that vitamin.*5

Research has correlated diets higher in magnesium to lower incidences of vitamin D deficiency.*7 

Consider these supplements to augment a bone-healthy diet and lifestyle. Cal-Mag Citrate Effervescent Powder and Vitamin D Liquid – both non-encapsulated products provide easy supplementation for kids and adults.


  1. Bergman G, Fan T, McFetridge J, Sen S. Efficacy of vitamin D3 supplementation in preventing fractures in elderly women: a meta-analysis. Curr Med Res Opin 2010;26(5):1193-1201.
  2. Institute of Medicine, Food and Nutrition Board. Dietary Reference Intakes for Calcium and Vitamin D. Washington, DC: National Academy Press, 2010. 
  3. Forrest K, Stuhldreher W. Prevalence and correlates of vitamin D deficiency in US adults. Nutr Res 2011;31(1):48-54.