Vitamin D is fat-soluble, is well-absorbed and there are no known allergies. There are not many food sources. In the U. S., milk and dairy foods are fortified with vitamin D but Americans still tend to be low.  Vitamin D is synthesized in the body from sunlight, but the sun is not always a reliable source of vitamin D, particularly for those living in the Northern hemisphere.  Using sunblock further blocks vitamin D synthesis. 

The benefits of Vitamin D are many: 

• Vitamin D manages the critical mineral balance in the blood and bones.
• Improves calcium absorbtion.
• Promotes strong, dense bones
• Reduces the number of falls and consequent skeletal fractures 
• Improves muscle strength and neuromuscular function
• Provides important immune and autoimmune support
• Nourishes gums and teeth 
• May reduce coronary plaque
• Improves joints and range-of-motion   
• Promotes lung function
• Supports colon, breast and prostate health
• May improve cognition