New Jersey, USA
Salmon, tuna, mackerel, egg yolks, sunlight
Only a handful of foods in nature naturally contain Vitamin D. Most other foods that contain Vitamin D (like milk) are fortified with it. In the 1930s, a Vitamin D milk fortification program was enacted in the U.S. to fight Rickets, a disorder that causes the weakening of bones in children. Also, keep in mind that Vitamin D3 has been shown to be much more effective than Vitamin D2.
Especially Important For
People that want to maintain strong bones and teeth.*
Muscle and bone strengthener*
Weight loss promoter*
Why it's important for immunity
Think of Vitamin D as an equalizer for the immune system, especially helping our immune systems stay balanced during the cold and flu season. If our immune systems have too much stimulation, autoimmune diseases can set in. With too little immune system activity, infections are more likely. In people that have low levels of vitamin D, both of these extremes have been shown to be more prevalent.
In 2009, the National Institute of Health stated that low Vitamin D levels are associated with frequent colds and influenza.
Evidence-based claims, or bust
NATIONAL INSTITUTES OF HEALTH
Vitamin D Fact Sheet for Health Professionals.
NATIONAL CENTER FOR BIOTECHNOLOGY INFORMATION
Dietary Reference Intakes for Calcium and Vitamin D.
JOURNAL OF CLINICAL ENDOCRINOLOGY AND METABOLISM
Vitamin D2 is much less effective than vitamin D3 in humans.
AMERICAN JOURNAL OF CLINICAL NUTRITION
Vitamin D and Health in the 21st Century: an Update.
NATURE REVIEWS CANCER
Vitamin D signaling pathways in cancer: potential for anticancer therapeutics.