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Most of us are - deficient in vitamin D. It is estimated that 3 out of 4 Americans are Vitamin D deficient. 
Our body doesn't make vitamin D on its own, however it does create the precursor to it, vitamin D2, then ultraviolet exposure converts it to the active form of vitamin D, which is vitamin D3. 

Low vitamin D levels have been related to a number of diseases.
 The only way to truly know if you are deficient is to get a blood test. The healthy range of D, number-wise, is broad because your body's needs depend on a number of factors. Doctor's feel that 50 to 100 is the optimal range for disease prevention.

You can obtain Vitamin D from the sun, however that has become unacceptable because of the relationship between the sun and skin cancer. 
The best and safest way to get D is by taking a high quality supplement. It can be very difficult to get ample D from sun exposure alone, since the standard recommendation on D is between 400 and 5000 international units (IU). Because vitamin D is a fat-soluble vitamin, it's absorbed by the body when taken along with a fat-based food, such as yogurt or a salad with olive oil dressing. 

Hilife recommends asking your doctor to get a blood test to know where your levels stand. Then, ask your Health Care Professional to recommend a daily supplement amount to be sure you get all the Vitamin D you need. We carry Vitamin D from many quality manufacturers at discounted prices.